Q. for flying replica builders...

Question: when building planes that originally called for "boat plywood," does substituting aircraft plywood hold any advantages, and how does it effect performance, if at all? I would assume using this in the wings would make a lighter front, but how much lighter? (in particular, I have the Dh2 in mind...)

Plywood was called 'Laminate' during the early years of aviation. The quality of the material was not as good as todays 'Aircraft Ply'- GL1 grade. One would have to use GL1 in the airframe for the build to be certified airworthy. The weight difference would be minute. GL1 would only be used on the leading edge of the wings.

Bob.

oops!

Ribs and leading edge.

Bob.

THere are some good Hoop pine plies available downunder in A bond and though classed as marine, they meet the AS 2272 codes for Aircrat quality. bit heavier but stronger too!
Our rules probably differ, but GL grading is universal. The aircraft ply available today is of very fine quality but needs to be tested too as part of your building, nothing like knowing exactly how strong the plane is!
Plies listed as marine A bond may well be suitable for building depending on GL grading local rules and timber type etc..

Nice to speak to you Gecko, Ive been working on the DVIII for the last little while, its a cheap little plane so far.

chris