Boat Plans Bolger | 2014 Calendar of Our Designs

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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Kayak Boat Plans | Black Cat on the Ocean Blue

Kayak Boat Plans

I am sure that most of my readers are well aware of our adventures on the prototype Didi 38 "Black Cat" in the Cape to Rio Race in January 2014. This is the boat that I built in my back garden in Hout Bay, South Africa and launched nearly 20 years ago. She was the experiment in boat construction that is the basis for all of my radius chine plywood designs, with many hundreds now on the water or in build around the world.

"Black Cat" is once again out on the wide blue South Atlantic Ocean. She is participating in the 1700 mile Governors Cup Race from Simonstown, South Africa, to St Helena, the remote island in the middle of the South Atlantic. Much as I would like to have been there, I was unable to join the crew for this race but they seem to be doing a pretty good job of it without my interference. They have led the monohull fleet both on handicap and on the water from the first position report and remain up there. Only the trimaran "Banjo" leads them.

"Black Cat" at start of Governors Cup 2014. Dave Mabin photo

The crew, led by Dave Immelman, has been having great sailing, with three consecutive days of 200+ mile runs in strong downwind trade conditions. Now they are working their way through the light winds of a high pressure system at lower speed but maintaining their lead. Dave is the resident skipper on "Black Cat" and was my navigator for the Cape to Rio Race 2014.

We wish Dave and his crew continued good sailing and that they can find their way quickly through the high to more good breezes.

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Boat Plans Pdf | Stability with Water Ballast

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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Boat Plans Stitch And Glue | Our 2014 Calendar Stocks Available

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 Bruce Roberts | Americas Cup Value to Sailing

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 Trailer Plans Australia | Our Boat for Cape to Rio 2014

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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Boat Plans Butler | Hitting the Nail on the Head with CC19

Boat Plans Butler

We all know what it means to "hit the nail on the head". Taken literally, it is so satisfying to hit a nail so square and hard that it drives a long way into the timber. Just a few such blows and it is home, securing whatever its destiny in life was to hold in its given place. Taken figuratively it means that we have expressed an idea very clearly and in a way that resonates with others.

In just the same way, it is possible to design something that is just perfect, that we would not like to do any differently if we were to start again from the beginning, even if armed with the experience that came from the use of that product. A designer can and should get tremendous satisfaction from his/her involvement in the process whenever that nail is so squarely struck on the head. I have been lucky enough to find that nail a few times.

The Cape Cutter 19 is just such a design. I really would not change anything at all about that little boat. I have not sailed them enough and hope that I will get many more opportunities to sail them. The sailing that I have done has always impressed me with the extraordinary speed, handling and ability of this little boat.

Two Cape Cutter 19s drying out in UK.

 It is not a racing boat, so dont expect it to plane downwind like a sportboat. It is a little cruiser that can sometimes make you feel like you can take on the sportboats. Take it out in light conditions and it will sail past virtually any other cruiser or cruiser/racer of similar size, as well as taking out many much larger boats that should be a whole lot faster. It is oh so satisfying to sail past a boat that looks much faster but isnt.

It is not only a light-weather boat though. Remember, I grew up sailing the waters of the Cape of Good Hope and spent most of my life sailing there. Most circumnavigators tackle the Southern tip of Africa with great trepidation because of the often violent wind and sea conditions. For those who live there, those are the conditions that are given, so they have to be dealt with. I designed the Cape Cutter 19 to sail those waters safely, with due diligence by the skipper, of course.

There is a really nice independent review of the CC19 and its bigger sisters on the SA Yacht Blog . It includes observations by the author of boats to these designs that he has seen in action around the Cape of Good Hope and how they have managed in those conditions.

These boats are loved by their owners and they are very sad to part with them. One such owner is Russell Eden in UK, who sold his CC19 this past weekend. I received these messages from Russell, repeated with his permission.

"I sold my Cape Cutter 19 today after three years of ownership.

She was number 47, built in SA. I wanted to personally thank you for creating such a beautiful craft. Each and every day I sailed her I had people approach me to talk. People would sail/motor over to take photos and video. People offered me money for her, there, on the spot.

Ive only sold her because my wife says she will come sailing with me more often if we had a boat with full standing room and a heads. I would have kept her forever otherwise.

Im sitting here now wondering what Ive done; Ive let go perhaps the most wonderful piece of property Ive ever owned. No doubt Ill get over it in time, but I doubt Ill ever own anything quite so easy on the eye, or so wonderful on the water.

Thank you for designing her."

Russell followed up with:-

"I really meant it too. You designed something which grown men cry after.

 That said, it was only ever the white ones I lusted after. I think you need to be able to see the lapstrake, which you cant always do on the darker hulls."

Russell Eden sailing his CC19 "Zephyr".

Thank you Russell, for your kind words. I get great satisfaction from them.

The Cape Cutter 19 is a GRP production boat built in UK by Honnor Marine . It can also be built from plywood from plans that we supply at http://dixdesign.com/ . There you can see our wide range of other designs as well.

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Boat Plans Pdf | Dudley Dix Yacht Design Calendar 2015

Boat Plans Pdf

Our 2015 calendar is ready and our first stocks arrived today. If you are a lover of our designs then this calendar will be a great piece of art to fill that empty space on the wall of your office, home or workshop.

The cover photo (also November) is a beautiful sunset photo sent by Phil Semenov of his self-built Didi 34, sailing in Ukraine.

Here are a few other sample pages.

June is a collage of photos showing the Cape Henry 21 built by Roeboats of Co Cork in Ireland. They used some interesting and very pretty detailing in this boat, built for a customer from France.

August is the Didi Sport 15 project of Hunter Gall in Virginia Beach, USA. She is named "Scallywag", which is what Hunters grandfather called him as a child. The main photo is an interesting view during construction and has a somewhat spiritual feel.

December is Petr Muziks Shearwater 39 "Shoestring III" sailing in St Helena Bay, South Africa. Petr circumnavigated on this boat when well into his seventies.

Order your calendar from our website via the link on our homepage at http://dixdesign.com/ and we will mail it to you.

Alternatively, click here to order from our  publisher, Lulu. They will print and ship one copy, or as many as you want, from their closest affiliate to your delivery address.

Either way, get yours now to be ready for January 2015.

If you have one of our boats and would like to see it featured in one of our calendars, please send me some nice high resolution photos of her. The pics need to show her in pretty surroundings or to be interesting in some other way. Now is a good time to start with the 2016 calendar.

And if you want to see more about our designs, please visit our website at http://dixdesign.com/.

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Canoe Boat Plans | Photos for 2014 Calendar

Canoe Boat Plans

I am starting work on our 2014 calendar and I am still looking for a few more photos to complete the 12 months plus cover that I need. If you have any nice  photos of your boat of our design that you would like to be featured in this edition, please send them to me. The boat doesnt have to be sailing or even in the water yet. If the photo is clear and interesting then we might use it. It also needs to be at least 300dpi resolution, preferably more.

Cover from 2013 Calendar, with Italian Dix 38 "Imagine".

August photo, Challenger 13 in Lithuania.

Boat size is not important, as long as the photo is interesting and high quality. We even have our smallest design, the Dixi Dinghy in the 2013 calendar in a photo that caught my attention.

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

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Boat Plans Skiff | Didi 950 Build Stringers going on

Boat Plans Skiff

Earlier this month I posted about the start of construction of the Didi 950 of Micheal Vermeersch in Ohio. Construction is progressing nicely.

The backbone components have all been fitted and glued. They have slotted connections, egg-crate fashion, with all of the bulkheads. Further into the project all of those junctions will be strengthened with structural epoxy fillets.

The sheer clamps have been scarphed into lengths sufficient to span the full length of the boat, from available shorter lengths. Before that they were also bevelled along both edges to remove excess material to save time later planing them to shape.  The sheer clamps are the major strength members along the deck edge. Normally they would sit flat against the inside of the hull skin but with these designs I turn them diagonally across the corner for a cleaner and lighter detail that also has a better balance of gluing area between the components that are being joined.

Now Michael is fitting the hull stringers. With this method of construction the stringers are arranged to suit the different regions of the hull skin. In the photo below you can see the sheer clamp, spanning the bottom corners of the bulkheads. Just above that is a topside stringer. There will be another similar stringer close to the chine that will accurately align the upper side panel.

The other full-length stringer that is in place is the tangent stringer that defines the edge of the curved portion of the hull that is laminated from thinner plywood. On top of the hull there is a stringer partially slotted in, defining the other edge of the curved panel.

Below the tangent stringer is a short stringer at the right in the photo. This is an additional stringer needed to fill in the space where the side panel increases in width due to the tightening of the radius toward the bow.

In the foreground are stringer lengths that will be scarphed together into the long lengths required. The angles have been planed and are ready for gluing.

 

 

 

 

 

Didi 950 with hull stringers being fitted.

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

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