Thinking jet sled

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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Permalink Reply by Robert Puckett on September 24, 2017 at 5:09am

another pic

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Permalink Reply by Robert Puckett on September 24, 2017 at 5:38am

I'll try to load a little better pic

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Permalink Reply by Eric Loudenslager on September 25, 2017 at 5:45pm
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.
Permalink Reply by Robert Puckett on September 26, 2017 at 5:08am

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. 

 

Permalink Reply by Bennett Yarbrough on September 26, 2017 at 8:00pm
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.
Permalink Reply by Robert Puckett on September 27, 2017 at 2:17am

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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