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venting closed ply?

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jgnunn

Well-Known Member
Joined
Aug 7, 2005
Messages
175
Location
Jarrell, TX. Fly out of Taylor-T74
hi. We have a discussion going on in our biplane forum, and i thought id get some input from you guys:

on the skybolt, the leading edge on the wings is covered in 1/16 ply. This is wrapped over the nose and finishes at the rear of the front spar. Usually fixed with t-88. This then in effect seals the ply creating a rigid D-cell. The discussion is whether this D-cell should have drain holes or not. My take was that if its sealed why drill a drain hole. Then someone interestingly mentioned about venting...if you fly at say 6000ft, the pressure changes, resulting in a psi change in the D-cell, so venting helps relieve this. This sounds logical to me, but I had assumed that the altitudes we fly in biplanes wouldn't have any detrimental effect on the sealed cell. I could be wrong...

any thoughts on this?
 
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