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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. |
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