Mustardbuilder wrote:
wrote in news:1169135944.927468.166880
@m58g2000cwm.googlegroups.com:



1/4" ply will bend more easily if you orient the grain
across
the bend instead of along it. The grain should be parallel to the
spars.
If it's 1/4" birch ply, that would seem a lot of overkill
for a wingwalk. If it's 1/4" pine or fir, it should bend without any
problem.


Well, I was planning to use birch in fact. hadn't thought about using
anything else but now you have me thinking. My real concern about
bending the stuff in the first place was, in fact, the stiffness of the
Birch ply. I imagined it never reall settling down. The 1/4 birch I have
is 12 ply and is like iron!

What do the plans call for? Any specific type of plywood? What
model of aircraft is it? 1/4" birch is awfully heavy, and if that's
what the designer calls for I'd wonder how overbuilt the rest of the
airplane is. My Jodel has a wingwalk of 1/8" birch and it's good
enough.

Dan