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Re: Skin-on-Frame: Canoe methods
By:Marc Upchurch
Date: 9/11/2014, 7:27 pm
In Response To: Re: Skin-on-Frame: Canoe methods (MattGeerts)

Yes, but I tried to use 1/4" Okoume ply for frames on a Yost kayak and they buckled under the the skin load when I heat tensioned the skin. This was the fwd cockpit frame. I had to beef it up with another 1/4" bonded on.
The plan called for 1/2".

Much of the strength of the plywood is in the wrong direction in certain sections. Specifically in the upper deck beam areas which had a longer distance between longerons.

Your ply bulkheads at 2' work because they are 1" deep instead of 1/4" like the steam bent ribs.
If you had 1/2" thick laminated bent frames they would be much stronger than the plywood. But a lots of work.
There was a guy who did just that on boatdesign.net

Messages In This Thread

Skin-on-Frame: Canoe methods
MattGeerts -- 9/10/2014, 3:38 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/10/2014, 5:00 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/10/2014, 6:24 pm
Re: Skin-on-Frame: Canoe methods *PIC*
JohnAbercrombie -- 9/10/2014, 7:03 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/10/2014, 7:12 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/10/2014, 7:23 pm
Re: Skin-on-Frame: Canoe methods
Marc Upchurch -- 9/10/2014, 8:27 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/11/2014, 12:51 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/11/2014, 1:17 pm
Re: Skin-on-Frame: Canoe methods
Marc Upchurch -- 9/11/2014, 7:27 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/10/2014, 7:07 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/10/2014, 7:19 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/10/2014, 7:30 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/10/2014, 8:02 pm
Re: Skin-on-Frame: Canoe methods
Bill Hamm -- 9/10/2014, 6:57 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/11/2014, 12:52 pm
Re: Skin-on-Frame: Canoe methods
Bill Hamm -- 9/11/2014, 3:25 pm
Re: Skin-on-Frame: Canoe methods
Marc Upchurch -- 9/10/2014, 8:36 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/11/2014, 3:20 am
Re: Skin-on-Frame: Canoe methods *PIC*
Peter Lord -- 9/11/2014, 6:49 am
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/11/2014, 2:02 pm
Re: Skin-on-Frame: Canoe methods
Peter Lord -- 9/11/2014, 3:20 pm
Re: Skin-on-Frame: Canoe methods
Bill Hamm -- 9/11/2014, 3:29 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/11/2014, 4:03 pm
Re: Skin-on-Frame: Canoe methods
Bill Hamm -- 9/11/2014, 5:59 pm
Re: Skin-on-Frame: Canoe methods
JohnAbercrombie -- 9/11/2014, 6:14 pm
Re: Skin-on-Frame: Canoe methods
MattGeerts -- 9/12/2014, 12:43 pm
Re: Skin-on-Frame: Canoe methods
Marc Upchurch -- 9/12/2014, 2:45 pm
Re: Skin-on-Frame: Canoe methods
Bill Hamm -- 9/12/2014, 6:35 pm