Rocketman612

My Feedback: (85)

I'm building a TF Corsair and am using Robart hinge points as well as rounding the leading edge of the control surfaces. I want to use a strip of 1/64 lite ply to overlap the gap by about 1/2 cm to give it a better scale look. I have already sanded down the balsa to have the ply flush with the top of the stab. My question is how to best orient the grain of the 1/64 ply? If I run the grain parallel to the seam will it curl down or up? Should the grain be perpendicular to the seam for more strength. Thanks, Pete

rogerflies

My Feedback: (3)

I'd put the grain perpendicular to the hinge line, and I'd also use 1/32" plywood.

Doesn't this fall outside the 25/25 rule, though? If you can't see it at 25 feet and 25 mph, why bother?

Roger

Rocketman612

My Feedback: (85)

Thanks,
I'm still going with the 1/64 as I don't want to add weight in these areas. Plan on doing this for Flaps,ailerons,rudder and elevator. Pete

Flypaper 2

I have 1/64 on the trailing edge of the wing for the flaps on a Yellow Cap 10 B with the grain parallel to the trailing edge, no warping problem.

Rocketman612

My Feedback: (85)

Thanks,
I'm going to glass this plane with lacquer based polyurethane and I wanted to know if anyone who did this had any warping problems. Pete

Flypaper 2

Mine was covered with Monocoat so you might want to make a dummy piece and see what it does with the polyurethane. As you know, it depends on the shrinkage. This is the surrest way.

k_sonn

My Feedback: (32)

Rocketman612:

For what it's worth there was an article in RC Scale International about this a couple years ago on this subject written by a Top Gun competitor (I will not use his name without his permission). He said the grain of the 1/64th plywood should run the same as the chord of the wing. It is much stronger this way. If it is run parallel to the wing there is a greater chance of breaking it off even if it is glassed. I have built all of my warbirds this way and have never had a problem with the trailing edges.