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Plywood Boat Plans | Didi 950 Projects

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Plywood Boat Plans


There appears to be considerable interest in my posts about the boats being built to our Didi 950 design. This is a radius chine plywood design with hard chine in the topsides, designed to fit into the Classe 950 box rule. In the past few days I have received a bunch of new photos that show the build process clearly, as well as some updated progress photos.

Before going into the new photos, you might like to read the article that I posted today on my Boatbuilder Tips for Amateurs blog about how to construct building stocks or beds, the foundation off which the skeleton of a wooden boat is built. It is illustrated with photos of the Didi 950 that is being built by Fred Grimminck in Australia. The photos below are mostly of that same project, being built from scratch without a kit.

The photo below shows the various backbone components, all of which slot eggcrate-fashion into the bulkheads. The slots help to locate the bulkheads and backbones correctly relative to each other. The bow and stern have single backbone on centreline and the mid-part of the hull as two backbones that run down each side of the keel support box. The two shorter pieces on the right are the paired double-backbone parts. Next toward the left is the aft backbone, which turns up at the far end to support the transom. Extreme left is the bow backbone, which turns up at the far end to form the stem and supports a bow bulkhead into which the forward ends of the stringers are located.
Didi 950 backbone components. Click on all photos to enlarge.
The photos below show a few of the forward bulkheads with the bow backbone dry-fitted in place. The backbone has doublers just below deck level for through-bolting the bow chainplate. The doublers can be seen at the forward lower end of the backbone.
Didi 950 bow backbone and forward bulkheads
Didi 950 bulkheads and backbones
In this next photo, the transom doubler has been set up as a doubler and the stringers etc run through, then are trimmed flush. When the transom is glued over the doubler the end-grain of the longitudinals will be covered and protected. Look through the 4th cutout from left through the doubler to see how the aft end of the aft backbone turns up against the inside face of the doubler. The backbone has locating tabs that slot through the doubler, seen as light-coloured marks on centreline of the doubler. In the lower photo the transom is being glued over the outside of the doubler.
Didi 950 transom doubler
Didi 950 transom being glued over doubler.
The sheer clamps on this design sit diagonally across the corner at the intersection between hull sides and decks. They are screwed and glued to cleats on the faces of all bulkheads. In this photo the sheer clamp is clamped to those cleats. You can also see how the stringers are slotted through the bulkheads. Once the hull skin has been glued on, these junctions become very strong and rigid
Didi 950 sheer clamp
Looking forward along the hull just prior to fitting the bottom skin. The wide stringers on both sides are the tangent stringers, with doublers to back up the joint between flat bottom panels and radius skin panels at the turn of the bilge.  The single aft backbone can be seen running through to the 3rd bulkhead from the bottom of the photo. The double backbone runs forward from the 2nd bulkhead from the bottom of the photo, then changes back to a single backbone further forward, also visible.
Didi 950 bottom stringers and backbones
Stringers in the forward part of the hull, mainly showing the radius area. The two broad stringers are at the tangents, joining the flat and radiused skins together. Between them are three radius stringers, over which the double-skin radius will be formed. Below the lower of the two tangent stringers are the stringers for the side skin panels.
Didi 950 stringers
This last photo shows Mike Vermeeschs boat, being built from a kit in Ohio. Mike has the side panels all dry-fitted to check for fit ahead of gluing in place. Looks like a nice fit. The bow will be capped with solid wood, which will cover and protect the end-grain of the stringers.
Didi 950 hull side panels
Thank you to both Fred Grimminck and Mike Vermeersch for taking the trouble to send me these photos and allowing their use.

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

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Boat Plans And Patterns | Cape Henry 21 Professional Build in Ireland

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Boat Plans And Patterns


Tiernan Roe is a professional boatbuilder in County Cork, Ireland. His company, Roeboats, specialises in building quality wooden boats. Mostly of classic styling, they build for sail, power or rowing. Roeboats recently launched a Cape Henry 21 that they built for a customer from France.Tiernan sent me these photos, which show some interesting details brought into one of our most popular small cruisers.
Cape Henry 21 ready to get wet.

Launched in a pretty setting.
First sail of the new boat.

The mainsail has still to be fully set up in these photos.
Compact sink & cooker unit, neatly executed.
Other side of the galley. Nice detailing.
Looking aft from the double forward berth.
You can follow the construction of this boat on the Roeboats news blog, from start through to launch.

After launch, Tiernan Roe sent me these comments. "She sails very nicely and I found her easy to single hand from the get go. The interior is pretty snazzy with frame and panel oak fronted drawers and a gas stove with tank fed sink.  Also the centreboard was a lot easier to operate than I thought. Its an awkward shape out of the boat to try and move alone."

To see our full range of designs, please visit 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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Dinghy Boat Plans | More on Stability with Water Ballast

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Dinghy Boat Plans


John Gilbert asked a question in response to my recent post, Stability with Water Ballast.

I do not get why the red and blue curves do not meet up at 180 degrees. Inverted the boat has no windward side as you point out, so you have water ballast on one side and none on the other side. As you have drawn the curves you have powerful stability in the  inverted position with the water on one side (red), but actually a righting moment if you have water on the other side(blue). What is the difference?

To help with understanding this I thought it better to write a new post that expands on the dynamics of stability than to try to answer it in the comments section after that post.

This will be more easily understood by seeing a diagram showing the stability graph expanded through a full 360 degrees rather than all conditions overlaid on top of each other in a 0-180 degree range. This is exactly the same stability info for the Didi 950 as shown in the graph of my earlier post but shown in a different manner.
Diagram of Stability through 360 Degrees
I will start with the green curve. This shows the stability without water ballast. The centre of gravity (CG) is on centreline. The stability curve intersects with the horizontal grid line at 0 degrees heel and increases identically both to left and right of the 0 degree line, so the boat will float without any heel to either side when right way up. The boat will stay that way in the absence of any wind, wave action or crew movement on the boat.

Follow the green curve until it comes down past 130 degrees to again intersect with the horizontal line at the Angle of Vanishing Stability (AVS). Then it enters a range of negative stability where it will proceed toward upside-down. At 170 degrees it crosses to above the horizontal line again. This indicates that the superstructure volume is trying to turn it back upright and doesnt want the boat to lie totally inverted. It will easily flop back and forth between the 170 and 190 degree points. The boat can return to upright along either green curve.

This all depends on a totally waterproof superstructure, of course. In practice water is likely to enter the boat at a rate that depends on what is open at the time, which will affect the inverted stability. 

Moving on to the stability with water ballast, in my earlier post I said that the boat will capsize along the red curve and recover along the blue curve. I explained the relationship between the two curves but that relationship is not easy to visualise if only seen across the 180 degree range.

In the diagram above you can see that the red and blue curves only meet in two places and both are on the horizontal line. These are the two points at which the boat will rest when there are no outside influences from wind, waves or crew movement.

The boat cannot rest totally upright nor totally upside-down because the weight of the water to one side is heeling it toward that side. It will rest at approximately -5 degrees heel instead of upright and at 200 degrees instead of upside-down when inverted.

Bearing in mind that the areas of the curves below the horizontal line indicate how much energy it needs for the boat to get past the AVS points so that it can right itself when in that 200 degree situation, it is now easy to see that it will take a large amount of wave energy to get past the AVS of the red curve but a very small amount of wave action to get past the AVS of the blue curve.

This graphic shows that if a water ballasted boat capsizes it will do so along the red curve but it is very unlikely to return along that same path, nor is it likely to stay capsized for long. Once past the AVS of the red curve the negative stability will push it to 20 degrees past upside-down. After that the blue curve will take over and almost guarantee that the boat returns to right-way-up pronto.

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Boat Plans Aluminium Australia | High build primer

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Boat Plans Aluminium Australia


The inside of the super structure was sand blasted, then received two coats of epoxy primer. The roof of the super  structure was sand  blasted, then received two coats of epoxy primer, followed by 2-4 coats of Acrylic Urethane. The roof of the super structure will eventually get a coat of some sort of non skid coating, but that wont happen until next year. The sides of the super structure is what Im working on now, and is what everyone will see and touch, got sand blasted, followed by two coats of epoxy primer, then three coats of high build epoxy primer. Once Im finished working on the high build, shell get another coat of epoxy primer to seal the high build, then three coats of top coat Acrylic Urethane.

The high build primer is another step I added to only the sides of the super structure. The purpose of the high build is only to help one achieve a nicer finish on the top coat paint. High build primer is able to be built up quickly to a thick layer, then is easily sanded back down. The easiest way to describe it is by calling it liquid body filler.

Just by the nature of the beast, building the super structure created many imperfections in the metal. Every place I welded a frame, or cleat  on the  inside, a bump in the metal was created on the outside. These small raised areas or "bumps, are called weld print through. If you run your hand over the metal, you feel the bumps. The print through will be extremely obvious on the  shiny final coat unless hidden. My method of dealing with it is to hit each spot lightly with the grinder before sand blasting to lower the bump below metal. The high build primer fills the now recessed area, and everything gets sanded smooth. The high build causes the print through to vanish.

All the welds on the super structure were ground flush, and the high build buries all the grinder marks and allows me to sand everything flush. Because the metal has been  laying around a long time, some rust developed, and after blasting the rust away, some pitting was evident. The high build fills 99% of those holes.

Once the high build  primer is sprayed on, I give it at least a day to cure before I start sanding. I use air tools for all my work. My preferred sander is a six inch dual action sander with a hook and loop pad that can accept a shop vac to eliminate the dust.  I first sand the panel using 220 grit, and sand any bad spots until I start seeing the under lying  epoxy primer. Once I have a panel sanded to 220, I go back over any questionable spots and add a bit of filler, the sand the filler to 220. Once Im happy with how things feel, I sand the whole panel to 400 grit. This sanding process takes some time, but its not hatefull, and goes rather quickly. The super structure is different than the hull in regard to  how its built and how it will look, so I dont feel as if I need to long board sand it to make me happy.  Once the panel is final sanded, and blown off with compressed air, is is now smooth enough that it  begins to show a reflection. I know things are going in the right direction when primer shows a reflection

As one is sanding with the 400 grit pad, the only way one can find imperfections is by feeling them with your hand. Eyes just arent good enough. The surface really is glass smooth, and any bump or ripple is easily felt by touch. The goal for me is to have a respectable looking paint job that will be easy to keep clean. While most areas seem insignificant, those small holes and marks will trap dirt, and ultimately speed up the demise of the paint. Because Im going to be the one whos eyes are going to be looking at things the most, I want it to work for me. As long as the surface is smooth and flat, buffing, polishing and waxing will work well in keeping the paint looking fresh for years to come. This could easily be a 15-20 year paint job.

High build primer is a porous coating and needs to be sealed with epoxy primer before the final coat of Acrylic Urethane is applied. The filler I am using also needs to be sealed, and there are some spots where I sanded to bare metal. There is no way around one more coat of epoxy primer, but thats a good thing and a small price to pay to make sure the job is done right. Once the last coat of epoxy primer is on the boat, I have 72 hours before the primer gets too hard and will not allow the top coat to chemically bond with the primer.  If I wait longer than 72 hours, Ill have to scuff to get a less than ideal connection between the top coat and the primer.

Its Sunday morning as I sit and type this entry, and the salon is ready for top coat. I still have to sand the wheel  house, but the trim, eyebrow, and all the difficult stuff has already been sanded and faired. The only thing left to be done on the wheel house is the flat panels, and that can be finished in four or five hours. Ill probably seal the super structure with primer early this week, and final coat the super structure by the middle of the week. I have one large area of "orange peel" I need to re paint on the hull, so I plan on sanding and painting this coming Saturday. As long as things go close to my planning, Ill have all the painting COMPLETELY FINISHED  by next weekend and Ill be able to  unwrap the hull and the super structure.

Cheers,





   

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Boat Plans Aluminium Australia | Kit build Dix 470 Plywood Catamaran

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Boat Plans Aluminium Australia


Assembly of the prototype Dix 470 plywood kit by Exocetus Yachts in UK is progressing nicely. This is the second hull, with improvements added into the kit since assembly of the first hull. These photos were sent to me by Exocetus.

Exocetus is able to use more advanced methods than would be used by amateur builders but the kit is set up to allow those with more basic facilities to produce comparable quality. Being the developers of the kit, they have cut all of the components themselves on their own CNC equipment. They also have a large press that they use to join multiple sheets of plywood into long panels or other large components, like bulkheads, cabin soles etc.

Sheets being joined into long hull panels by means of a press.
This long outboard hull panel was pre-assembled into one large piece before installation.
Inboard hull side fitted, with horns for major bulkheads projecting into the bridgedeck area.
Bottom panels were fitted installed.
The side panels were glued into longer lengths for convenient assembly with the equipment available to Exocetus. For my own projects and more primitive methods, I prefer to assemble skin panels in single-sheet lengths. This leaves considerably more scope for adjustment during installation to remedy any possible errors that arise due to builder error. The bottom panels were installed in single-sheet lengths, to allow accurate fitment at the centreline joint.

In the last photo above, the jigsaw joint was aligned using a strip of plywood, wrapped in plastic tape, as a temporary butt-strap. A short screw into each lobe of the jigsaw pattern ensured accurate assembly and held the joint securely until the epoxy had set.

For more info on this and our other designs, visit http://dixdesign.com/ . For more info on the kit and options, go to http://exocetus.net/ .


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Boat Plans Nz | Thomass Hayes new Flats skiff build

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Boat Plans Nz


Thomas Hayes is a fourth generation boat builder from Florida. He has been working in the Fiberglass production boat building business for 18 years working in all phases of the fiberglass production of boats as a hands on builder to supervisor. He knows his trade very well. 
I have had the pleasure of corresponding with him over this past year answering questions and giving my opinions and some advice on his personal project. 
He started out just wanting to design and build his own skiff for himself and then two more for family. This project has grown from just a hull mold to now a finished complete skiff with all molds ready for production of many more.
Following are some pictures Thomas has been sending me of his skiff in progress.
He has not launched his skiff as I write this blog but it will soon be in the water.
Lots of new ideas being used here in his skiff. Look closely... As I feel lots of these ideas will be finding their way to Others new designs.


Heres his unnamed new skiff just pulled from the mold. For the underbody pictures go back and look at my old blogs about new skiffs. This looks to be the driest running skiff out there. Cant wait to see her running.


Huge bow spray rail and lots of underwater spray defectors.


Look at that bow over hang. This skiff will weigh around 600-700 lbs when finished. Its a nice big skiff.


Heres the deck with all the hatches installed. No hinges on deck!!! All his hinges are hidden with his unique hinge system. Its very simple when seen.


 Bow hatch finished.


Bow hatch details revealed. How cool is this?


His moldings are as good as they get.


His deck mold has no hatches molded into it. This means that he can move his separate hatch molds where ever he or the clients want them. Look next to see how this works.


Because of his perfect moldings he just puts the finished part on the deck mold. He then gelcoats the deck around this part and when it cures this part is then glassed in as part of the deck. When its all pulled out of the mold all he has to do is just trim and slightly buff in the transition edge of these two parts. To me this is brilliant. Saves having to make so many deck molds. Now you can have more shop space.


All hatch tooling parts in place here ready for the deck gelcoat and then glass work.


Now the deck is attached. The clear glass in the bulkhead is the side of the fish live well or bait well depending on what youre up to. This detail he saw in an old Cabo Boat and has carried it into his skiff.


Wont that be fun to look at when its full of bait night fishing? The black ring is the drain.


The not so fun side if youre the bait or the fish caught looking out into the cockpit. Look at the details and finish throughout. Top of the line. 


Skiff going together.


Console being finished. Now look.


Console details. Look at what goes here.

Removable cooler box. 

Thomas says he has been influenced by early Hells Bay and Gordon Skiffs having owned an 18 Waterman and a Glades skiff. 
He has put lots of effort and money into this project that has taken him a year of part time work. At present he says he has almost the same amount of $ in his first finished skiff here and all molds as a new store bought skiff bare hull. 
But he now has the molds to build the next two that his family members want and then he will have to see if he wants to get in the market to build more for others.
Wait and see how this skiff performs. It might be the next " ONE" for you.
Thomas will always be able to say " Yes its my own design and build" with pride.
Theres nothing like being in a boat you built yourself.
Well done Thomas and good building to you a master craftsman.


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Boat Plans Arch Davis | Didi Sport 15 DS15 Launch

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Boat Plans Arch Davis


The long-awaited day arrived this weekend. Jim Foot, in Port Elizabeth, South Africa, launched his self-built DS15 at Algoa Bay Yacht Club. He started with a pre-cut plywood kit supplied by CKD Boats in Cape Town and took approximately 6 months of his spare time from start to launch.
DS15 "Bateleur" about to get wet for the first time.
 Despite the very light wind, they had good sailing and were impressed by performance. Jims first comments are:-

She sails beautifully and she is fast. Beating into a chop in light wind this am going at about 3,7 kts felt happy. Then was told wind spd 4 kts by passing boat quite amazing.
Very well behaved. No balance issues. Save a bit of lee helm with the kite up. Loads of compliments from older sailors. Hunter Gall get on the water you dont know what you are missing. This is one good boat. Ps only sailed in bulb config at this stage.
A few changes to make. But not many. Congrats Dudley on a fantastic hull. Its a beaut.

Ready for sails and rarin to go.
Rigging the sails. Clean deck layout and large cockpit.
Jims friend Mark Dawson was with him for the first sail and passed these comments:-

Lucky enough to be the first to sail this boat with James Norman Foot. What a beaut! After a hairy moment of rocking the boat to moorings, which became a desperate paddle when we started drifting towards the rocks, we rigged the sails and immediately accelerated away. Bateleur likes to sit flat and notably accelerate in the lightest of wind puffs. A forced capsized showed how stable she is and how literally effortless to bring her back. Sailing the Didi 15, I just want to go again. Cant wait to see her in stronger breeze. In summary...I need one.
"Bateleur" returning to ABYC with a very happy crew.
Jim will keep us up to date with his testing and fine-tuning over the next few weeks. I hope that we will also get to see some photos and videos in stronger winds as Jim and "Bateleur" grow to know each other.


The top photo of this post shows the hull shape very nicely. For those who have not followed my posts about the build, this is a plywood boat although it doesnt look like one. It is the smallest in our radius chine plywood Didi design range. The hull is the same family as the Didi Mini Mk3 and Didi 950, with topside chine above a radius chine underbody.

It can be built from plans only, plans and patterns or plans and a CNC kit. See more info about all of our designs on our website at http://dixdesign.com/


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