Now I got the little pram how I want her. I'm now thinking jet sled. I've been searching around the net and looking at various designs. Now this isn't something I would tackle on my own but I happen to know a great builder in Michigan. One of the designs I'm looking at is a Ken Hankinson design. I found some photos of this design being built and it is unlike anything I've seen before. It seems to be a double layer hull. Has anyone seen this done before? What do you members think is the reason for a design like this? Is it for strength? Is it for ease of getting the contours of the hull? what do you think?

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It is called cold molding. Typically used to form a curved hull....like on a sailboat. Can't tell whether the hull in question has all that much arch to it. But a single sheet of thicker ply might be to stiff to form the curve. It would be used in a circumstance where the hull requires modestly stout skin.

Thanks Eric for pointing me in the right direction. I've been reading about cold molding. It makes perfect sense. Thinner layers running in the opposite direction makes the hull tremendously stronger. As opposed to a single sheet where all the grain runs in one direction. I've been watching videos of some of the wooden yachts being built and they all seem to use this technique with 4 or 5 laminations. For a jet sled the added strength is welcomed. 

 

It's how all the cool kids are building bigger 18ft+ mahogany runabouts and wood center consoles now. check out Luke walkers osprey 18 build on www.smithmarinedesign.com its in the underway section. This is what made me want to build a drift boat to see if I could possibly tackle an osprey one day. Another place with tons of cold molded builds is glen l's sight glen-l.com they have a forum.

Yes it was on the Glen-l site that I found the Ken Hankinson plans for the Scrambler. A small 16 ft jet sled. Most of the plans are offered in wood and aluminum construction. 

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