Wing walk ply question.

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

wrote in news:1169163273.789874.240970
@l53g2000cwa.googlegroups.com:


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?

no, he pretty much leaves the whole thing up to the builder. Not much
more than a mention that there is one!

What

hatz..

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.

Well, it's a pretty strong airplane. He calls for Mahogony or birch
throughout but I've got a good supply of aircraft birch so that's what
I'm using (there's not a lot of ply in it anyway) They come out
reasonably light if you don't go nuts on things, though. I have a good
idea what I want to do with the wing walk, but I just didn't want to
make a mess with the ply top.