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Boat Plans Bolger | 2014 Calendar of Our Designs

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Boat Plans Bolger


Our 2014 calendar is now at the printers and we will have the first stocks ready for shipping in a couple of weeks. Get your orders in and we will ship as soon as they come in, well in time for you to use as Christmas gifts or to hang on your wall come January 1st. Order here.

We have a nice selection of photos again this year. Here are the cover photo and a few months as samples of what it contains.
Cover of our 2014 Calendar
January
May
July
September
Thank you to all who have allowed us to use your photos. For other builders who are not featured, we have already started to collect photos for our 2015 calender. This is a good opportunity to show off what you have achieved, so please send them to me by email.

We have changed suppliers this year, in the interests of keeping the price reasonable. The supplier that we used in the past has hiked their prices way up and would have necessitated a considerable increase. With the new supplier we can hold the price at the same level as the past two years.

To see our range of boat designs, please go to http://dixdesign.com/ .

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Boat Plans Aluminum | 2013 Wooden Boat Show at Mystic

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Boat Plans Aluminum


The Wooden Boat Show is to be held at Mystic Seaport in Connecticut again this year. This is the 22nd running of this annual show, which has settled comfortably into this beautiful location as an apparent permanent venue. Mystic Seaport is a wonderful place for a family day filled with a mixture of boats and maritime history. If you have not been there before, this is your opportunity to experience boats of today as well as how they were built and operated hundreds of years ago. Mystic Seaport is a living museum of the sea, so much of the shoreside support infrastructure and industry that went along with boatbuilding, trading, fishing etc. is represented there for visitors to experience.

Our inside exhibit at the 2012 Wooden Boat Show
 We will be there again this year. We have exhibited out Paper Jet prototype (Sail #001) on this show every year since 2007. We have booth 4B in Tent A on the Village Green, where you can see a display of a selection of our designs and buy plans or a copy of my book "Shaped by Wind & Wave". We can also take your order for a pre-cut plywood kit for many of our plywood designs. The first time that we exhibited the Paper Jet it received the "Outstanding Innovation Award" on the Concourse Delegance. Paper Jet will be on the lawn outside Tent A and will occasionally be out sailing.
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Outstanding Innovation Award 2007
Come to Mystic Seaport to see a wide range of wooden boats, ranging from my modern little skiff to beautifully built modern classics or even to take a ride on an old steam-driven ferry. You wont be sorry that you took the time out to visit this place of yesteryear.

P.S. I hoped that we would have the prototype of the DS15  at the show as well but it will not happen this year. The builder is not yet ready to show his boat.

Visit our website at http://dixdesign.com/ .

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Boat Plans Pdf | Stability with Water Ballast

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Boat Plans Pdf


A potential builder of the Didi 950 asked me a question about stability with water ballast. He could not find an explanation on the Internet describing the effects of water ballast on a boat when capsized, so here it is.

After looking at the stability curve, he was concerned that the stability curve with water ballast to windward, the normal position for sailing in strong winds, has a very large area of negative stability. He wanted to know how that affects the time that the boat will take to right itself if capsized. This is a natural question following the amount of discussion that has been happening after our recent capsize in the Didi 38 "Black Cat" and the very rapid manner in which she returned to upright.

Shown below is the stability graph of the Didi 950 in fully loaded condition; click on the diagram to enlarge it. This is the condition of lowest stability due to the inclusion of crew, stores, liquids and many other weights that are above the centre of gravity (CG) of the boat. There are three curves shown. When looking at the graph, consider that the area enclosed by each curve above the horizontal 0 line is a measure of the energy that is required to take the boat from upright to the point of vanishing stability (AVS) where the curve crosses the 0 line. Until the AVS is reached, the boat will return to upright if no additional heeling force is applied to it.  Beyond the AVS the boat will continue to full capsize unless there is another force being applied that will return it to the positive side of the AVS.

The green curve is with ballast tanks empty, so akin to sailing a boat that has no water ballast. This curve is very similar in form to that of "Black Cat", with the area enclosed by the curve above the 0 line many times greater than the area enclosed by the curve below the 0 line. She would right herself very quickly with no water ballast. The red curve is with the windward ballast tanks filled, good for powering to windward or power-reaching in strong conditions. The blue curve is with the leeward ballast tanks filled. One would not sail her like this but it is a situation that could result from an accidental gybe in strong winds.
Didi 950 Stability Graph. Click to enlarge.
With no wind or waves and the ballast tanks on one side filled, the boat will not rest upright. It will heel over until it stabilises at a heel angle that places the CG vertically in line with the centre of buoyancy (CB). That will be the nearest crossing of the curve with the 0 line, which is at 5 degrees in this case, seen on the blue curve. Add some wind to bring the boat to 0 degrees heel and the righting moment that is working is the point where the red curve hits the left edge of the graph. Without water ballast the boat must heel to 6 degrees to reach the same righting moment. That is where the power benefit is coming from with water ballast, the boat will sail more upright than with empty tanks, in the same wind strength.

Note that all three curves are closely bunched when the boat is heeled 90 degrees. This is a knock-down situation, probably from losing control when driving hard downwind under spinnaker. The mast is horizontal but not in the water. This bunching of the curves at 90 degrees is because of the position of the ballast tanks in this design, low in the boat fairly close to the vertical CG. There would be a bigger spread if the tanks were located high up under the deck.

The red curve shows the benefit of increased righting moment when the windward tank is filled. There is considerably greater gain in stability shown by the red curve than lost stability, shown by the blue curve, when ballast is on the wrong side.


All three curves show that the wind alone cant capsize the boat. When the mast hits the water there is still considerable righting moment available for all three situations. If the boat is in large waves and hit by a big one while knocked flat, the added energy from the wave can capsize the boat in all three situations. 

It seems counter-intuitive but the condition most likely to invert the boat under wave action after a knock-down is with the water ballast to windward (red), i.e. the condition in which the boat will be sailed in strong winds. This is because after the water ballast passes beyond the point where it is vertically above the overall CG of the boat that extra weight is on the wrong side of the CG and is helping to capsize the boat rather than to bring it back to upright. It pulls the red curve below the green curve and reduces the AVS from 133 degrees to 122 degrees. 

Overall it takes more energy to capsize the boat from upright with water ballast than without, evaluated by comparing the area enclosed by the red curve with the area enclosed by the green curve. When the area enclosed by the blue curve is compared with the green curve, there is very little difference. It will take a similar amount of energy to capsize the boat without water ballast and with water ballast on the wrong side, when going from upright. Ironically, the wrong side has the greatest amount of reserve stability after a knock-down and has the greatest angle of AVS, so it is the condition least likely to capsize after a knock-down.

Back to our capsizing boat. Once past 122 degrees it is into a big range of negative stability that shows as the area enclosed by the red curve below the 0 line, taking it all the way to 180 degrees, i.e. totally upside-down. But see that the curve does not return to 0 at 180 degrees, which means that it is unstable at that angle. Same as happens when the boat is upright, the water ballast off to one side prevents the boat from resting at the 180 degree position. It has to rotate to where the CG is vertically aligned with the inverted CB. That is at the point where the curve crosses the 0 line. If the red curve is extended to the zero line it will be to the same angle that the blue curve crosses,  i.e. 160 degrees.
 
There is no windward or leeward when the boat is upside-down, the sails are under water. The boat is stable in the 160 degree position, so leaning 20 degrees to one side of upside-down. It needs to get past the nearest zero crossing to come back to upright. The boat doesnt care which way it goes. It needs a lot of energy to go back the way that it came along the red curve but very little energy to get to the 140 degree AVS crossing of the blue curve. With the motion from just a small wave it will continue past that 140 degree point. Once that point is passed, the righting moment of the blue curve takes control and will return her to upright. If the rig is still standing then the sails will fill and she will be back into the stability situation shown by the red curve. She has capsized along the red curve and righted herself along the blue curve.
In essence, it will take a lot less energy for the boat to right itself with water ballast than without, so she should right herself more quickly with the water ballast. The difference is that without water ballast she can go either way from inverted to upright but with water ballast she has to go full circle.

To visit our website, go to http://dixdesign.com/




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Wood Boat Plans And Kits | Kits for our Plywood Boats

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Wood Boat Plans And Kits


Kits for our plywood boats have been available in USA for more than 10 years. This has had mixed success, depending on who was cutting the kits. Following on the sale of the company that had the rights to cut our kits, the quality of service deteriorated to a level that was no longer tolerable, so I rescinded the cutting rights. That brought us to the current arrangement of marketing the kits ourselves and sub-contracting the cutting to Chesapeake Light Craft in Annapolis.

This has worked out very well. The quality of the kits supplied to date has been excellent and the shipping has been both economically priced and efficient. They have cut numerous dinghy kits, including the Dixi Dinghy  and the Paper Jet.
Plywood Dixi Dinghy, fun little 3:1 dinghy to row/motor/sail.
The are currently preparing to cut a large kit, comprising 61 sheets of plywood, for a Didi 950 that will be shipped to a builder in Ohio. This is a radius chine plywood boat with topside chine that is designed to the Class 950 Rule and makes a very nice fast cruiser, in addition to its primary racing purpose.
3D image of radius chine plywood Didi 950
We have also sent them an order for a smaller but nevertheless substantial kit. This is for a Didi 29 Retro that will be shipped to a builder in North Carolina.This is also a radius chine plywood boat but without the topside chine. It is a development, in classic image, from our popular Didi 26 trailer-sailer design and will be rigged with the cruising rig option of the two gaff rigs that we supply with the design.
3D image of radius chine plywood Didi 29 Retro
I have reworked the panel files for these large kits so that all parts that are larger than a sheet of plywood are jointed with jigsaw joints. These joints are easy to assemble and produce very accurate panels.  Click to read about jigsaw joints.

The range of plywood kits that we can offer in USA is expanding fast. Click to see the full list. If there is a plywood design for which you want a kit, please email Dudley and ask for a price. It may take a week or two to rework the panel files to suit the Chesapeake Light Craft format then get a price for the kit but we will get that info to you as speedily as we can.

If you are outside of the USA, you can still order one of our kits from our suppliers in other countries .

To see our full range of boat designs, please visit http://dixdesign.com/

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Boat Plans Stitch And Glue | Our 2014 Calendar Stocks Available

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Boat Plans Stitch And Glue


A few people have told me that they were disappointed that we had sold out of our 2014 calendars before they were able to order and have asked if we dont have a spare copy that they can buy. Sorry, all were sold and we have none left except for one hanging on our own wall.

All is not lost though. I have set up a link where anyone who wants can order direct from the publisher at the same price that we were charging. You may even get a discount from them if you time it nicely when they have a special offer running.
Cover of 2014 Calendar
To order, please Click here. From this page you can also order my book "Shaped by Wind & Wave" if you dont already have that, either in hard copy or ebook format.

Our website is at http://dixdesign.com/, where you can see all of our designs.

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Boat Plans Skiff | Our New Office Up and Running

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Boat Plans Skiff


We have moved to our new home, still in Virginia Beach. With more office space than we had before, we have been able to set up a separate print room to house our two large format HP inkjet roll plotters. The plotters and computers are all up and running, once again talking to each other.

We are still surrounded by many boxes that have to be emptied but we are progressing with the reorganisation. We are once again ready to fill orders, whether for printed plans or those that can be supplied by email.

Thanks for your patience though this inconvenience, we are back online.

Our main website ~ http:dixdesign.com/
Mobile website ~ http://dixdesign.com/mobile
Pricelist and orders - http://dixdesign.com/priceabr.htm

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Boat Plans Aluminium Australia | Update on Didi Sport 15 and Didi 950

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Boat Plans Aluminium Australia


I have recently added two new radius chine plywood designs to our range and wrote about them on this blog. Here are updates on both boats.

Yesterday I visited the prototype of the Didi Sport 15 (DS15) that is being built by Hunter Gall in Virginia Beach. I hadnt seen it in the flesh for a few weeks and wanted to see how the deck is looking as it comes together. Hunter is doing a really nice job of his project, working slowly but meticulously.

His boat, "Scallywag", is looking very pretty. He stained the hull surfaces blue and the deck surfaces red before doing the epoxy coatings and these colours will be highlighted by areas of clear-finished timber. It all entailed a tremendous amount of extra work to get it right than if he had painted it in the normal way. The final result is very attractive and she will be an eye-catcher when complete. Hunter can be pleased with the overall results.

The deck configuration that I designed is unusual, with a raised mast deck and wave-breaker above a flat foredeck and the open self-draining cockpit. It gives a decidedly retro image to the deck, over the thoroughly modern hull. It reminds me somewhat of the Lightweight Australian Sharpies that my Dad sailed in South Africa when I was a child. That makes it  somehow fitting that Hunter Gall is Australian, I am South African and we have ended up working together on this project in USA.


Hunter Galls DS15 project nearing completion
Other news on the DS15 is that work will start in the next few weeks on moulds to build a composite version in Europe. I will release more information about it after I return from the Cape to Rio Race, by which time the builder may be ready to start receiving enquiries.

The other boat was the Didi 950, for which the prototype kit has been cut and will be delivered to the builder in the next week or two. It appears that this is going to be a popular design because we have sold plan packages for another three boats since announcing the design.
Didi 950, bigger sister to the DS15
 One of those boats will result in a variation on the design, with a lifting keel. A lifting keel was part of the original concept for the builder of the prototype but he decided in the end on the simplicity of a fixed keel. The lifting keel proved to be a very viable option, using the same basic keel support arrangement as the fixed keel with no structural redesign. The major difference will be moving the motor aft to a position under the companionway, driving a saildrive rather than a shaft. This is to make room for the lifting keel to rise through the galley central locker unit.

The prototype of this design is to be built in Ohio, USA. The others that have been ordered will be built in Australia, Latvia and Greece. There is interest from other countries as well.

To see our full range of designs, please visit http://dixdesign.com/.

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Boat Plans Bruce Roberts | Americas Cup Value to Sailing

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Boat Plans Bruce Roberts


I have recently been quite active on the LinkedIn forums about Americas Cup. It is not in my nature to participate in forums because I have found that it is all too easy to get drawn in and become embroiled, fending off attacks by Internet trolls whose great ambition in life is to be destructive to others. LinkedIn is a more closed community and less apt to show this nastiness and aggression. If I feel strongly enough about an issue then I will have my say and keep up with the rest of the discussion.

Just such a discussion came out of my last blog entry, about Race 13 exceeding the time limit. You can read that entry by scrolling down the page or go to the blog archive on the left of this blog. The response was that races should not have time limits and should just continue until there is a winner. It referenced baseball as a comparison. Discussion then progressed to the format that is being used for this current edition of Americas Cup, AC34. Some of my posts have been well received and it was suggested that one post in particular should be read by a wider audience.

I responded to the following question. I dont want to name the poster, I dont have his permission.

"So I am going to go back to my question on the cup. Forty minutes time limit for an Americas Cup race? I would like to see the last race ground out for say 2 hours of excitement vs. just 40 minutes. Are we an ADHD society that if it goes longer that 40 minutes we loose our audiance (sic). I dont care. Its the Americas Cup. It should be raced with sweat and tears to the end. It should go as long as a football game or basketball game(including time outs and media breaks). Shouldnt it?"

Here is my response.

"We all have our own ideas on what should be and what shouldnt be. Whos to say which is right? I agree that 40 minutes does seem too short a time limit but I understand the aim of the organisers to popularise sailing competition with the non-sailors and the parameters within which they were working.

Sailing is its own sport and it is evolving rapidly with technology. Do you really want to watch these two boats sailing back and forth upwind and downwind for 3 hours or more each race and potentially for 17 days (19 days including the 2-race penalty) in a row? That will drive the TV viewers back to whatever they were watching before AC34 came along.

I grow thoroughly bored watching football and baseball. They are stop-start games and they hold the attention of the audience for very short periods of action. The players get to rest for much of the duration and only work in short bursts. They can go on all night if needed, without burning themselves out. The crews on these boats are working hard the whole time, every race.

I think that it will work to compare AC racing with cricket. Test cricket takes 5 days of play, broken into 4 sessions each day. With no limits aside from the 5-day time limit, it often ends with no winner. It bores most people to tears. Then one-day international cricket was introduced, featuring 50 overs (300 balls) bowled by each team against the other batsmen. Suddenly cricket became interesting to a much wider audience. Now they play international 20-over games and the games are very exciting to watch, with massive viewership.

Rugby was always an exciting running game but it has also gone the same route of short, very fast and exciting games with the Rugby Sevens. This is what is needed to hold the attention of the modern world, where there is always something else trying to grab attention. Why should sailing not be right there in the fray also grabbing attention with short, fast and very exciting races.

Sailing is a sport of ageing players and needs new and young blood to survive. This event is likely to attract new people to sailing in one form or another. We can watch yacht racing as we knew it 20 years ago until it goes the way of the dinosaurs or we can embrace the new world and regenerate sailboat racing as a viable sport.

There is still a place for 5-day test cricket, for a much smaller audience than the other forms. Likewise, there is also still a place for the longer duration sailing races. I will be skippering a 38ft sailboat across the South Atlantic in January. We will be racing flat-out for 3 weeks from Africa to South America. There will be exciting times for me and my crew far away from the eyes of any TV audience. I enjoy that racing immensely, as a participant but I dont expect our slow progress across the ocean chart to keep anyone rivetted to the edge of their seat the way that AC34 is doing to us right now.

I think that with AC34 they have hit a winning formula and I am enjoying every short minute of it.
"


Thank you for taking the time to read my viewpoint. It is often a bit off the beaten track but I think that it is valid.

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Boat Plans Wood | Didi 38 Prototype Birthday

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Boat Plans Wood


"Black Cat" is the prototype of my Didi 38 design, built in my back garden in Hout Bay, South Africa. She was also the experiment that developed into my radius chine plywood range of designs, all under the Didi name. Today is her birthday, it is 19 years since we launched "Black Cat" at Royal Cape Yacht Club in Cape Town.
Didi 38 "Black Cat" at the start of the 1996 Cape to Rio Race.
Much has happened since then. She has 70 sisters in the water or in build around the world, in the Didi 38/40/40cr design series. She also has hundreds of smaller radius chine plywood monohull sisters being built or in the water, from the Didi Sport 15 through to the Didi 34. She has also spawned catamaran designs in the Dix 470 and DH550.

When I designed her, I did not imagine how popular this construction method would become. The Didi 38 design was for my own use. After that I drew the Didi 34 for a design competition that was run by South African Yachting magazine, now part of Richard Crocketts Sailing for Southern Africa magazine. Since then I have always had at least one other concept waiting in line for me to draw it for this method of construction. Now is no different, I have a commission for a 38ft big sister to the Didi 950 and have many people asking for smaller sisters to the two catamarans, in various sizes. All that I need is the time to draw them.
"Black Cat" in Brazils Bay of Islands.
Happy Birthday "Black Cat", you have been very good to us.

To see more of our designs, go to http://dixdesign.com.

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Boat Plans And Patterns | Idea 19 an Italian Variation of our TLC19

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Boat Plans And Patterns


In late 1988 I was commissioned by Nebe Boats in Cape Town to design a 19ft trailer-sailer of very modern image and capable of handling the very robust sailing conditions common to the Cape of Good Hope. The result was the TLC 19, a speedy and capable little boat with fractional rig, fine bow, long waterline and scoop stern. It also had transom-hung rudder and swing keel or fixed wing keel options.
TLC 19 sailing on False Bay
The TLC 19 hull plug later became the hull for Anthony Stewards boat for his circumnavigation. Anthonys epic voyage was completed in 1993 and to this day nobody else has accomplished his feat of sailing an open boat around the world. The endurance required to sail that distance and for that length of time in a tiny boat without cabin, sailing through whatever conditions nature could throw at him, is incredible to even consider.

Anthony Steward arrives home after circumnavigating.
Another version of the TLC 19 is being built in Italy and can be home-built from strip-wood construction methods. It has been developed by Christian Pilo and uses our hull but a different deck, rig and interior. It is named the Idea 19 and has proven to be a speedy and capable little cruiser/racer. More information is also available on the website of Nautikit, our Italian agents.

Idea 19 sailing in Italy.
 To see more of our designs, please visit our main website at  http://dixdesign.com/ 
or our mobile website at http://m.dixdesign.com/ .

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Boat Plans Australia | Our Cape to Rio Race Wrap up

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Boat Plans Australia


First off I want to say thank you to all friends, family and supporters for all of the good wishes that have poured in following our experiences in the Cape to Rio Race the past few days. The five crew of "Black Cat" are all very grateful for the assistance received. As is always the case, stories have varied depending on the source and they have no doubt expanded with the telling and retelling. I will tell it from the very personal point of view of being right there in the middle of the action.

The weather briefing two days before the race start told us there there was bad weather expected and their advice was to sail due west as fast as possible to get through the system to the high that would follow. That would give us SW winds that would turn S then SE. With my navigator, Dave (Wavy) Immelman, we decided to follow that advice as the most logical route. The weatherman warned about being in the SW quadrant of the storm that would follow a day or two later.

The race got off to a good start in light breezes, the course taking us around the perimeter of Table Bay. This was a good indicator for us of our chances of placing well in the race because we were very quick, and staying in the lead group of 4 smaller boats trailing the 3 big guns that led the fleet. Our group opened up a large gap from the others behind us.

We sailed through the first night in gradually strengthening wind that gave squalls of 20-25 knots. Around daybreak the squalls started to intensify and broke through 30 knots with 18-20 knots between them. Feeling a bit over-powered in the squalls we were reefing the mainsail when a squall of somewhat over 40 knots hit us. We were now entering the SW winds behind the front, so I changed from our westerly course to a NW heading, taking pressure off the sails. Despite that, the wind over the deck increased, with gusts of over 50 knots that shredded our new carbon jib, leaving us under main only.

While changing from the #1 jib to the smaller #3, we were running before and gaining speed rapidly. Wavy was standing on the foredeck at the forestay, hauling down the tatters of the jib when we took off down a wave, accelerating to 22 knots. The waves were very short and steep and we ran straight into the back of the next wave, washing Wavy aft against the shrouds, spraining his ankle and inflating his automatic life-jacket. At the same time the tiller went sloppy in my hands. Although "Black Cat" was running fast and straight down the wave she was doing it on her own, we had no steering.

We dropped all sail and elected to sit out the worsening conditions before setting up a jury rudder to take us back to Cape Town. "Black Cat" was comfortable and in no danger. While we waited we saw the German entry "Iskareen" sail past from behind. We thought that this very fast boat was ahead of us so it came as a surprise to see them come past from well astern.

The wind and sea moderated quite quickly from that first storm and we put our minds to making a jury rudder from lazarette floor boards. Sean Collins went over onto the sugar-scoop to screw and strap it to the stub of the rudder that remained below the pintels. It worked reasonably but we treated it gingerly for fear of breaking it. We motored on a heading for Cape Town but as the day progressed the conditions slowly deteriorated as a second storm started to move in. I saw that we were not going to lay Cape Town so elected to rather head for the closer and easier Saldanha Bay.

As evening approached this storm grew progressively more violent. We were in the SW quadrant of the storm about which the weatherman had warned us. We had no desire to be in that position at that time but we had no choice in the matter. Fate had placed us there and we could only do our best to cope with the situation as it developed.

Around dusk there was a massive bang, a noise that sounded like the boat being ripped apart. Sean had shouted a warning from the cockpit that I cant repeat in present company but none of us heard it. Suddenly we were upside down and the cabin was filled with flying bodies and objects that were loose in the cabin and also those that were inside closed and latched lockers. I had been sleeping on the starboard saloon settee and had only a few seconds earlier stood up to walk aft to the cockpit. I was still in the saloon and was hit on my face and top of my head by unidentified flying debris, leaving me with minor cuts and a black eye.

The noise of this impact was so great and our up-turned position so alarming that I thought that the keel had come off. I was on the cabin roof and looked up at the bilge, all cabin soles having fallen out. I saw no gaping hole as I expected but shouted "Everybody out!!", still thinking that we had no keel. This all happened in a few seconds, then suddenly she was upright again and I knew that we still had a keel. We were left with an awful mess of food packages, cabin sole panels, tumblers, containers and anything else that managed to find its way out of its allotted place. And there was water everywhere. There had been some in the bilge but a lot more had come in through the companion hatch and a hole that we had no yet identified.

With no instruction from anyone this very capable crew automatically set about sorting out the chaos, first picking up anything that could block the bilge pumps before starting to pump out the water. The day fridge, which had been bolted into the saloon table, had relocated itself to the settee on which I had been lying only 30 seconds earlier. Three fire extinguishers, mounted in brackets from which they are removed vertically, all fell out when we were inverted and flew across to the starboard side of the cabin. Only two of the five onboard were in steel straps with locking mechanisms that held them firmly in place, the other three fell out and became lethal missiles.

Next we discovered what the hole was that had appeared in the deck. During the inversion process the tail of the mainsheet went over the side and attached itself to the propeller and wound itself up to the point that it stopped the diesel motor. It had so much tension in it that the force downward on the upper guardrail wire punched the nearest stanchion through the 12mm plywood deck. That left a hole about 75mm diameter into the locker below, where my clothes were. From there the water spread itself all over the starboard aft cabin, soaking everything that Wavy and I had in that cabin. That was all of our clothes, bedding, camera bags etc.

Of more consequence, the volume of water that came into the boat spread itself over the chart table, the lid of which had ripped right off, and into the electrical panel and electronics. The two satellite phones and main VHF radio were drowned, leaving us with only a hand-held VHF of limited range with which to communicate. Smelling smoke, Wavy opened the electrical panel to see smoke coming out but it didnt develop into a fire.

Time stands still in these situations. I have no idea how long it took us to clean up the boat but she was back to a semblance of ship-shape before too long. The hole in the deck was plugged as well as possible with some muti that we had brought onboard the day before the race start.

In the midst of all this Sean came down from the cockpit and described what had happened. From inside the boat we had no idea, it was just massive noise and upside-downness.

Sean, a surfer like me, says that he suddenly felt the same feeling as when caught inside the impact zone of a big surf break, where you have no way of escaping the beating that is about to be dealt to you and you just have to take it on the head and cope with it. He did not see the wave coming but became aware of it as it loomed over the boat. It was very large and broke as a hollow tubing wave completely enveloping "Black Cat". She rose up the face of the wave, rotating as she rose until she was hanging from the roof of the tube. Then she fell or was thrown down the face of the wave with the mast going in first. The crash that I heard inside the boat must have been the cabin and deck hitting the water. While this was happening I also looked into the cockpit for Sean and he was hanging from a winch or whatever he had been able to grab as the wave reared up. I required that all crew be hooked on with safety harnesses before going on deck but Sean was hanging on so tight that his harness had no work to do.

This wave was much bigger and more violent than any others we had felt or seen. If that one could clobber us there may also be others, so we streamed warps from the bow and deployed the storm jib as a sea anchor to try to hold her bow-on to the waves. These did not seem to help much because the underwater current seemed to be pretty much the same speed as our drift. We didnt get her to lie more than about 20-25 degrees from broadside-on to the waves but it seemed to be enough to ease the motion a bit and cause other breaking waves to roll past the port quarter instead of hitting us amidships.

The worsening storm and loss of major communications prompted us to ask Cape Town Radio to put out a Pan-Pan message on our behalf to warn of our location in the shipping lane and to ask for the NSRI (National Sea Rescue Institute) to be called to our assistance. We advised that we were in no immediate danger but would appreciate assistance when it could be provided. We switched on the EPIRB to give a signal for rescue services to home in on. We had AIS onboard but it had flooded along with the other instruments at the nav table.

Initially the assistance came in the form of the fishing vessel "Miriam Makeba" heading our way. When they were still a few miles away the navy frigate SAS Isandlwana took over control of the widespread rescue efforts and released the fishing vessel to continue fishing. As the frigate approached in the rain they asked us to send up a flare, then another, to help them to locate us. Once they had located us we confirmed that we were in no immediate danger and they headed off to take care of people and boats that were in much more serious situations.

In the morning conditions again subsided. Wavy went over the side in his diving gear to free the mainsheet from the prop, which allowed us to restart the motor. At the same time he swam the length of the underbody to check for damage or other problems. A new and improved version of the jury rudder was fabricated from more plywood cannibalised from the lazarette and we continued on our journey toward Saldanha Bay at 4-5 knots under our own power. We were well set to reach there during the night.

Early afternoon the NSRI Rescue 3 arrived from Cape Town. They offered us the choice of continuing under our own steam to Saldanha Bay or accepting their tow back to Cape Town. Proceeding to Saldanha Bay presented logistical problems for crew and boat, so we took the tow and headed for Cape Town at 10 knots.

Manoeuvring into the RCYC basin proved to be more difficult than anticipated because the jury rudder boards added to the starboard side of the rudder severely limited rudder movement in that direction. Add a pomping SE gale and we sorely needed the welcoming hands on the dock to catch us as we came in at rather high speed and with negligible control.

Now "Black Cat" is safely back in port but she has some more patching to be done to her. This is for the hole in the deck from the stanchion and for the spot where her bow kissed the marina rather harder than necessary on our return.

My big question out of all of this was "Why did the rudder break?". It had a solid Iroko spine nearly 100mm thick and 150mm wide, extending top to bottom, with plywood fairing to leading and trailing edges. That is a massive piece of timber that can easily support a large car and really should not have been broken by a 22 knot surf. The answer came from the owner, Adrian Pearson. He told me that when "Black Cat" was squeezed between the steel RCYC marinas a few weeks ago when the mooring chains broke, it was not only the hull and keel that were damaged. He said that the rudder was also "graunched". If that is so, it may have started a fracture of the rudder spine that culminated in the blade shearing off at high speed.

We are all very disappointed that our race had to end this way. We were going so well and must have been in with a reasonable chance for a top result. Unfortunately, we will now never know. We are just glad to be back on land safely and are very grateful to NSRI and the crew of Rescue 3 for their part in it, as well as the "Miriam Makeba" and SAS Isandlwana.

I also want to thank the crew of "Black Cat" for being such great and capable shipmates, always ready to do the right thing and with a smile.

Adrian Pearson (owner)
Dave (Wavy) Immelman (Navigator)
Sean (Buttercup) Collins
Gavin (Doris) Muller

And a big thank you must also go to our  Didi 38 "Black Cat". She took a hammering on our behalf and came through with negligible structural damage.

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Boat Plans At Mystic Seaport | The skiff list DETAILS

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Boat Plans At Mystic Seaport


When staring to work on a flats boat skiff design you have to make up a weight list to know in advance what is going into and on your skiff. With this you get an idea what its going to cost after sourcing out your parts and materials. Also if you can weigh each piece in advance then you can work with this on your new design. The thing to realize is that 98% of what you see on the below list is what will go on most all skiffs in the 12 -25 range and upwards. The only differences will be rub rails and engines.
Every thing else will be small sutilties. But it maters when you want to have a skiff weigh out all up in the 600-700 lb. range. It also matters in all kinds of other boats like high performance sailboats , multihulls and anything that wants to be fast with low horse power. So get a good scale and start weighing every thing and make your list. I would print up mine here for you but I cant find it right now.

When I was in business for myself I used  to make up these parts lists and price all my whole sale vendors against each other to see who had the best deals. This really played out well when building  over $400,000.00 in boats a month. Doing a one off today in your garage its best to find a freind in the business and see if you can get stuff from them at a good break in cost. Today on the Internet you can find all kinds of good deals but you have to take the time to do this. I am always looking through old boatyards for deals to be found. It helps to be thinking years or projects in advance.
This list is blurry here. If you can see it the prices are old but gives you an idea of whats up.
I will post all these drawings on my facebook photo page as they are real clear there.


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Boat Trailer Plans Australia | Our Boat for Cape to Rio 2014

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Boat Trailer Plans Australia


A few weeks ago I announced that we will sail in the Cape to Rio Race in January. If you missed it, you can read it here. Now I would like to tell a bit more about the boat.

Her name is "Black Cat" and she is very special in my life. I designed her, I built her in my garden and I have sailed her across the South Atlantic three times. I have also raced and cruised her for many, many miles on the notorious Cape of Good Hope waters and she formed the foundation of my best selling range of boat designs. She is the prototype of the Didi 38 design and older sister to designs from the DS15 (Didi Sport 15) through to the DH550 .
"Black Cat" with her crew on launch day.
 I started concept sketches during the 1993 Cape to Rio Race on the Shearwater 39 "Ukelele Lady". "Ukelele" is very comfortable and carried us across the Atlantic in 29 days, excellent for a cruiser.  Still, I resolved part-way across  to do the next race on a boat of my own, which would be better able to take advantage of the downwind surfing conditions found on this race.

The new boat was to be cold-moulded wood. It was to be very light, with a big rig and deep bulb keel for high performance. Light and beamy boats are uncomfortable at sea and I sometimes get seasick, so I designed her relatively narrow for comfort. Narrow beam would also make her even faster.

I had nearly 3 years to build but I had a very big problem, I had no money to start. It was nearly a year before I had money to start building. Now the problem became a lack of time to build the cold-moulded boat, so I had to find an alternative solution that would be quicker to build.

My solution was to develop a method for building a rounded hull shape from plywood, using a radius chine form developed from my metal designs. I needed it to be mostly sheet plywood for fast construction but a rounded shape for performance, aesthetic and resale value reasons.

The resulting boat was 4 tons displacement in measurement trim and with 50% ballast ratio. She turned out to be clean, simple, pretty and a delight to sail. In two Cape to Rio Races she carried us across the Atlantic in 21 days in vastly different conditions. In one race she topped out as 18 knots and covered 250 miles in 24 hours. On the other her top speed was 22 knots but her 250 mile record went unbroken.

Where did her name come from? She is, after all, a yellow monohull and not a black catamaran. Black Cat is the top-selling peanut butter brand in South Africa and they sponsored her in the 1996 race. The kids knew her as the "Peanut Butter Boat" and her big  Black Cat spinnakers attracted a lot of attention.
Moving well in very light breeze.
She is quick on all headings in light breezes. The above photo was taken while racing on St Helena Bay in only 3-4 knots of breeze, a race in which she took line honours with a very comfortable lead over the 2nd placed boat, also a 38ft cruiser/racer.

She also loves to run free in a strong breeze. From cracked off on a fetch through to a run, she flies in strong conditions. Like me, she loves to surf. I surfed her at 22 knots down a very big wave mid-Atlantic after a storm.

Yet, she remains a home-built plywood boat and I look forward to spending 3 weeks with her and her crew as we cross the ocean once again. In the next few weeks I will write about the crew who will keep me and "Black Cat" company on this voyage.

To see our full range of designs, please visit http://dixdesign.com/ .

PS. Entries for the race currently stand at 26 boats, with another 19 pending. The race website is at http://www.cape2rio2014.com/ .


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Yacht Boat Plans | Hacker Update

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Yacht Boat Plans


Today I moved our website and all associated systems to a new server. All is up and running except that we have lost our mobile website due to the change. When I have the time to do so, I will build a new mobile site. In the meantime can you please use our main website at dixdesign.com for mobile access as well.

To make this easier, I have simplified our homepage and removed outdated or redundant info and links. It is cleaner, loads faster, is easier to read and is better for zooming to access links. It will be a big benefit if our Turkish supporters will also be able to view it.

When I do build a new mobile site I will announce it on this blog.

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Dinghy Boat Plans | Mid Atlantic Small Craft Festival Cancelled

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Dinghy Boat Plans


This weekend was to be the 33rd running of the very successful and popular Mid-Atlantic Small Craft Festival in St Michaels, Maryland. That was until yesterday, when the weather man decided to stick his oar into the mix. He has sent Tropical Storm Joaquin in our direction and the forecasts are for it to increase to a Cat 3 hurricane at times, passing rather close to us here in Hampton Roads as well as the the Festival location 200 miles north, with intense winds and possibly a foot of water falling from the sky.

If you planned to join us there, stay home, dry and safe. This is the first time that this event has ever been cancelled. I was to be the dinner speaker and would still like to do this event, so lets plan to be there same time, same place, next year.

Seeing as you will likely be trapped inside like us while the weather demons do their thing in the sky, why not spend the time cruising the designs on our websites, at http://dixdesign.com/ or http://dixdesign.com/mobile.

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Boat Designs And Plans | Radius Chine Plywood Class 950

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Boat Designs And Plans


The Didi 950 is our newest design and the plans are now nearing completion. They show a very modern boat that is designed to comply with the Class 950 Rules and which can be built by any reasonably competent amateur woodworker.

Sail plan of Didi 950
The Class 950 Rule produces a fast boat that is great for level boat-for-boat racing. The rule results in reasonable proportions and features, for a safe and strong boat with comfortable accommodation that is also good for a performance cruiser.

Class 950 accommodation
Construction is radius chine plywood with a hard chine aft in the topsides. This format produces a very modern hull that is built mostly from a very low-tech sheet material, yet looks as good as any moulded composite boat that can only be built with skills that most amateurs dont have. Most men are comfortable working with wood and this construction method allows them to use those skills to build a competitive boat.
3D Profile of Didi 950
The more that I look at this boat the more that I would like to be on it for offshore or ocean racing. This would be a great boat for sailing trans-Atlantic in the Cape to Rio Race or going across the Pacific in the Trans-Pac Race. Close-reaching to broad-reaching under asymmetrical and powered up by water ballast tanks, she will be a thrilling boat, reeling off the miles like few others in this size range can do.
3D View with contours to highlight hull shape.
Someone close by, please build one of these boats. I need to sail on this one.

For more info go to http://dixdesign.com/didi950.htm and visit our website at http://dixdesign.com/ to see our other designs.

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Boat Plans Wooden | Some Thoughts on Capsize in the Atlantic

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Boat Plans Wooden


I am back home in Virginia Beach and working my way through the mountain of email, progressing toward normalising my work again. I have swapped the Southern Hemisphere for the Northern one, summer for winter and cruising the Brazilian Bay of Islands for a blizzard that is coming later today. What else is there to do than to dig right into the pile of work that awaited me?

A relaxed holiday on the sunny beaches, mountains and waters of Cape Town gave me time to absorb and reflect on the whole experience of turning a big boat upside down on the ocean.

Many people have said to me that it must have been a frightening experience but I didnt find it frightening at all. I remember thinking "Oh, we are upside down, was that a wave or have we lost the keel?". My next thoughts were about the safety of Sean, who was alone in the cockpit. I saw through the companionway that he was hanging on tight then my eyes and mind went back to what was happening inside the boat.

Sean says that he wasnt frightened either. The wave broke over the top of him and he was entranced by the mast spearing the water as "Black Cat" rolled over. He wondered if the mast would still be standing after she righted herself. He says "Rather a surreal experience more than frightening. BC ("Black Cat") felt safe somehow."

In contrast, Gavin had what might be considered a more normal reaction to what had happened. He got a big fright and his reaction was to move into the cockpit and stay there, where he felt safer (in the event of another capsize) and from where he was able to pump water from the bilge with the pump that is mounted in the cockpit seat. Gavin is the youngest member of the crew but has almost as many seas miles in tough conditions as the rest of us and can cope with anything that is thrown at him at sea.

I think that the big difference between Gavins reaction and that of Sean and myself is possibly due to our different experiences in waves. Gavin is not a surfer but both Sean and I are. We have spent countless hours in breaking waves that are sometimes big and frightening. As with all things in our lives, our minds get sensitised by our experiences and it takes progressively more intense experiences to break through that sensitising and make an impression. That sensitizing helps us to keep a clear train of thought in intense situations. This situation involved being thrown around by a big wave and was less out of the ordinary for us surfers than for the non-surfers in the crew.

It was also a lot more frightening for those on land than for us on the boat. We knew exactly what our situation was but loved ones on land could only speculate. They were hearing very sketchy reports from multiple sources. They knew that we had hassles and they knew that there was a very violent storm hammering us. Their minds were having a field day imagining all sorts of things happening to us on the ocean in wild conditions. Whether or not our actual experiences surpassed their imagined ones I dont know.

A few people have asked if I would rather not have been there or if I would have preferred it to have happened to someone else. Truthfully, a definite no. I am glad to have been there and to have experienced this. I am pleased that it happened to me and not to someone else. If I could exchange what happened for anything else, it would be that we did not break the rudder and were able to continue our Cape to Rio Race as planned. But that was not to be. We did break the rudder, we did get blown back into a very violent storm, we did get turned upside down by a big breaking wave and we did all survive with minimal damage to the boat or injury to the crew.

The result is that I went through that roller-coaster washing machine and I did it with my eyes open and my analytical brain switched on. I was able to observe for myself what happens in this situation, what happens to the boat itself and to everything that is inside this kaleidoscope tube as it turns through 3D space, jumbling up crew, stores and equipment and leaving them all relocated in whatever positions gravity and rotational forces happened to have thrown them.

I consider myself, crew and boat to be fortunate to have come through as lightly as we did. I also consider myself very fortunate to now be one of what must be a very small number of boat designers who have this experience in their backgrounds, an experience that is foreverafter there to influence how and why we do what we do in every future boat that we design.

I was told a few months ago by an interior design specialist that she wanted to work with me to design interiors for my boats. She said that on boat shows and in magazines she had seen some really bad interiors and the fact that she was talking to me on this subject seemed to infer that she thought that my interiors could do with improvement. I asked what ocean sailing experience she had, which proved to be none at all. I told her that my interiors were designed to be safe for a gyrating boat on the ocean, not for boat shows or drinking cocktails on a marina. My interiors and all other aspects of my designs come from my experience at sea, gained over many thousands of miles of cruising and racing in conditions from delightful to horrendous. From now on they will also be influenced by my experience of being tossed out of control inside a capsizing boat.

To see our range of boat designs, please go to http://dixdesign.com/.




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Plywood Boat Plans Australia | Get your Orders to us Early

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Plywood Boat Plans Australia


The end of 2013 is coming fast. We normally have a rush of orders around year-end but this year it is going to be different. Remember, I will be sailing in the Cape to Rio Race and that is going to create considerable disruption in delivery of orders. I will fly out on December 14th, via Istanbul in Turkey to Cape Town, South Africa. After sailing across the South Atlantic, I will return home from Rio de Janeiro, Brazil, about the first week of February 2014.

Dehlia is the person who glues this operation together. She is my wife and she receives the orders, processes the payments, prints the drawings and magically sends them all over the world, allowing me to spend my time drawing pretty pictures of boats and backing up you, our builders. Normally Dehlia would continue unflustered while I am away playing boats. This time it will be different, Dehlia is also going to Cape Town, to wave goodbye tearfully from the dock. She will leave our home and office before I do, on 3rd December. She will not be back to resume business until 14th January 2014. For a month there will be nobody here to print drawings.

Please dont leave your order until the last minute, we may not be able to supply. This is even more important if you intend to order a plywood kit to build one of our boats. It takes more time to set up a kit order than only to supply plans.

We hope to set up systems to take orders while away, for items that can be supplied by email. That will be for our 3:1 dinghies, study packs and eBook "Shaped by Wind & Wave". Paper orders will have to wait until after Dehlia returns 14th January.

Please send your orders by 29th November. After Dehlia leaves I will be able to process and supply only limited orders.

Thank you for your support both past and future. I apologise for any convenience that this disruption may cause you, we will be back as soon as possible.

Go to http://dixdesign.com/ to see our full range of designs.

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Boat Plans Aluminum | Its My Boat Radio Interview

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Boat Plans Aluminum


Its My Boat Radio is a weekly online radio program that runs on Blog Talk Radio. Hosts are Barbara Jean Walsh and Ann Avary. They do interviews with people who are experienced boaters or in the boating industry, on a broadening range of subjects.

This week I was invited to participate, on the subject of kit boats. You can listen in to the program by clicking on the link below. It is about 30 minutes and you can listen while doing other stuff. Unlike live radio, if you think that you missed something then you can go back to whatever part you missed and listen again, or go back to the start and listen to the whole program again.

Kit Boats and More! online radio program

Small selection of our plywood kit designs
Plywood kits for our designs

To see our full range of designs, go to http://dixdesign.com/

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Yacht Boat Plans | Didi 950 Build Bottom Skin Panels

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Yacht Boat Plans


Mike Vermeerschs amateur boatbuilding project of a Didi 950 is moving on to the next stage, with bottom panels fitted and work starting on the side panels. Mike is building from a plywood kit that we supplied to him and reports that the fit is good. The kit has jigsaw joints on all large panels, making them easy to assemble either on the floor or on the boat.
Didi 950 with all stringers installed.
Two of the stringers each side, at the junctions between flat and radiused skin areas, have plywood doublers attached to serve as backing pads to the joint. I call these the tangent stringers. The doubler on the upper tangent stringer is in process of being fitted and can be seen running forward from the transom through to the third bulkhead from aft.

In the photo below, the transom has been fitted, followed by the bottom panels. These panels each have two transverse jigsaw joints and join each other at a centreline butt joint over the plywood backbone. In the photo the jigsaw joints have temporary battens over them to secure them while the glue is setting.
Bottom panels fitted.
Mike has also started to dry-fit the side panels ahead of gluing in place. At the right of the photo the forward lower panel can be seen and which will continue through to the transom. The lower edge, as seen upside-down like this, forms one half of the chine. The other half of the chine will be formed by the upper side panel.

Today Mikes 300lb brother decided to test the hull stiffness of this partially-built Didi 950 . He climbed onto the bottom of the boat and jumped on the bottom panels. They passed his improvised test but I think that I would have recommended that he wait until the whole hull was skinned before doing such a test.
Mikes 300lb brother tests the Didi 950 hull stiffness.
The broad stringer that shows on this photo is the upper tangent that will join the lower side panel to the radius.

To see our other designs, visit http://dixdesign.com/ .








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