Wing cracking at the mounting points on a 4*
 

Has anyone else experienced this?? I am recovering my 4*40 ARF and found that the balsa around the mounting bolts had cracked and was actually coming loose.. I don't do that many aerobatics and it was a 40-sized engine afterall :)

Anyway, I reinforced the area with some light ply.. just curious about your experiences..

Sachin

RE: Wing cracking at the mounting points on a 4*
 

guess I'm the only one??

RE: Wing cracking at the mounting points on a 4*
 

Was there any plywood in the kit to reinforce the area where the screw heads bear down on the balsa? Is that what is cracking?

Bob

RE: Wing cracking at the mounting points on a 4*
 

That is indeed what is cracking and it was an ARF.. There is plywood where the screw head comes overlying the balsa.. However, the plywood had torqued into the balsa on both sides causing cracks.. I put a big plywood square over both screw holes (one piece) to fix and prevent future cracks..

Sachin

RE: Wing cracking at the mounting points on a 4*
 

Maybe someone over tightened the wing bolts a few times.

Just a thought.