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Re: Strip: Internal strongback
By:Ross Sieber
Date: 2/28/2002, 10:01 am
In Response To: Strip: Internal strongback (Craig)

: OK, it's time for The Plunge; the forms are here, the strips are here, and
: it's sawdust time for a Spring Run. For a number of reasons, I'm doing an
: internal strongback, but I want more rigidity than a simple 2x4. Planning
: on laminating 1/2" ply into a 2x3.5in beam, probably with vertical
: pieces topped and bottomed by a horizontal plate; should that be stiff
: enough to keep this newbie (first effort!) straight?
: Thanks in advance for any input!

: Craig

A plywood beam may not be as rigid as a 2x4. Mine isn't. Mine's made of
3/4" plywood, and it is much more flexible than a 2x4, especially
sideways. It sagged a little bit, maybe 1/16" after I put the forms on.
It doesn't seem to twist much, if at all, though.

The reason I went to the plywood beam was because my 2x4 warped before
I started stripping, and I didn't want to risk having the next one warp
when I was half done. So far it's working great, but you have to be very
careful about alignment at first. Add a few strips to each side and it
becomes very sturdy. As far as I can tell, my hull is straight as an arrow
and I think it's going to stay that way.

There are some good reasons to use a plywood beam, but I am not sure rigidity
is one of them.

Messages In This Thread

Strip: Internal strongback
Craig -- 2/28/2002, 8:44 am
Re: Strip: Internal strongback
Rod -- 3/1/2002, 11:56 am
I'm sure we can beat this one to death
Tom -- 3/1/2002, 8:33 pm
death throes
mike allen ---> -- 3/4/2002, 1:59 pm
Re: I'm sure we can beat this one to death
Don -- 3/2/2002, 11:17 am
Re: Strip: Internal strongback
Nick Schade - Guillemot Kayaks -- 3/1/2002, 9:18 am
Re: Strip: Internal strongback
Andy Waddington -- 3/1/2002, 4:14 am
Re: Strip: Internal strongback
Richard -- 2/28/2002, 10:54 pm
Re: Strip: Internal strongback
John Skinner -- 2/28/2002, 11:45 pm
Re: Strip: Internal strongback
Tom -- 2/28/2002, 10:43 pm
Re: Strip: Internal strongback
Ken -- 2/28/2002, 6:18 pm
Re: Strip: Internal strongback
Rob Macks -- 2/28/2002, 2:12 pm
Re: Strip: Internal strongback
Joe -- 2/28/2002, 2:30 pm
internal has its merrits too
Tom -- 2/28/2002, 11:01 pm
Re: internal has its merrits too
Scott Fitzgerrell -- 2/28/2002, 11:50 pm
Re: internal has its merrits too
Joe -- 3/1/2002, 1:19 am
Re: internal has its merrits too
Richard Boyle -- 3/1/2002, 9:21 am
Well said *NM*
Tom -- 3/1/2002, 8:04 pm
Re: Well said ....MAYBE ?
Joe -- 3/1/2002, 9:25 pm
Re: Well said ....MAYBE ?
Richard Boyle -- 3/2/2002, 10:13 am
Re: Well said ....MAYBE ?
Joe -- 3/1/2002, 11:07 pm
Re: Well said ....MAYBE ?
Tom -- 3/2/2002, 5:32 pm
Re: Well said ....MAYBE ?
Craig -- 3/2/2002, 7:49 pm
Re: Well said ....MAYBE ?
Joe -- 3/2/2002, 6:25 pm
Re: Strip: Internal strongback
Scott Fitzgerrell -- 2/28/2002, 1:06 pm
Re: Strip: Internal strongback
Ian -- 2/28/2002, 12:46 pm
Re: Strip: Internal strongback
Rob P -- 2/28/2002, 1:19 pm
Re: Strip: External Strongback
KenC -- 2/28/2002, 9:49 pm
Re: Strip: Internal strongback
jim kozel -- 2/28/2002, 11:48 am
Re: Strip: Internal strongback *Pic*
John Schroeder -- 2/28/2002, 1:43 pm
Re: Strip: Internal strongback
Bill Oetjen -- 2/28/2002, 11:19 am
Particle board
Brian Nystrom -- 2/28/2002, 12:38 pm
Re: Particle board
Joe -- 2/28/2002, 12:50 pm
Re: Strip: Internal strongback
Joe -- 2/28/2002, 12:23 pm
Re: MDF, OSB and Particle Board
Nick Schade - Guillemot Kayaks -- 3/1/2002, 9:39 am
Re: Strip: Internal strongback
Ross Sieber -- 2/28/2002, 10:01 am
Re: Strip: External strongback *Pic*
rick thomas -- 2/28/2002, 6:24 pm
Re: Strip: External strongback
Ross Sieber -- 2/28/2002, 6:40 pm
Re: Strip: Internal strongback
Joe -- 2/28/2002, 10:34 am
Re: Strip: Internal strongback
Paul G. Jacobson -- 2/28/2002, 9:33 am