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1st photo shows a wishbone boom. (Aft sail) 2nd photo is the square top by Bernd By using the Wharram i lose the need for tracks on the mast And gain the clean leading edge of mast. Honestly, i

Thanks for the reply What you posted seems to mirror what i have read about that rig over the years. Good to hear real world facts. My thinking, with Bernd help, is to keep the current good traits

Well said. That was my experience also, on the two Wharram designs I built. I chose to go with a square topped main rather than the gaff rig on my new CO 6 for those reasons. The wing sail works well,

Hi, I had a Wharram Wingsail on my Hinemoa - it is an approved option for which you can buy the plans. I used a round aluminium mast made by Z-Spars and sails by Jeckells. I used Dyneema shrouds and

Wishing you an early paint job in the New Year. We are all anxious to see the KD122 launched and sailing!

Hello everyone, dismantled and numbered, all the pieces of the covering and internal furnishings of the KD 122 It was all spray painted with RAL 9010 ethane cleaner. By early January they will all be

Thxs, i think for smaller mast, this works. For a long, wider mast, not so sure with the compression, you can get it off. Even with the proper epoxy finish, release agent, peel ply ect on thr manderl.

Bernd suggests leaving the mandrel inside the finished mast. Here is another option I have used. After applying mold release to the mandrel, laminate a couple very thin layers over the mandrel and

Bernd Hope your hoilday is going well. I have revised my plans for the 860 a bit. I have a few questions i need answerd before i buy plans. 1 Would you support a single Wharram soft wingsail on the

Ahh, understand, thanks. Im not one to mess with designers calulations. The mast build is putting the wheels before the cart at this point, for me. Long way to go ?

Can not be done in sections The mast layup is a well-calculated construct from diagonal layers, UD layers of carbon, and UD glass fibers. Stress analysis indicates that the mast has to be strong in

I just looked at the photo...ha! Looks like i reinvented the wheel! ?

Thanks Never thought about leaving the pvc inside the mast. I ask (i dont know) Is the weight still less then a alum. Mast while using a combo of pvc and carbon? While thinking on this a bit more,

Hi David and all Building masts, in general, is like building another hull. Some remarks and tips. I propose using PVC gutter tubes as mandrel.? Then the can stay in the mast. As you have

Thxs for that, everything i researched says bunz' ply with gaboon superior I can get it from the dist. At a good price per sheet.

You got here something wrong. Because I am sure I did not write this. Here again is some general wood data. See table—some wood data for plywood for boat building. *Matterial? ? ?Weight? ?

Hi Bill, A year ago I discussed with Bernd about the choice of ply. One of the key consideration is weight. He said that impregnated marine ply are usually very heavy and not suitable. From what I

30 years ago I was involved in the manufacturing of pressure vessel made out of fiberglass and epoxy. We used a filament winder with a stainless steel mandrel. With zero draft angle over several meter

Carbon mast I had to make a carbon mast 20 years ago for my boat, which had junk sails on unbraced masts. The method: We made a whole series of bulkheads, circles the inside diameter of the mast, made

For my ply selection, what do you think about: BRUYNZEEL MARINE GRADE PLYWOOD https://www.mcilvain.com/news/bruynzeel-marine-grade-plywood/ Thats the US source