Hi there, I know its kind of late concerning the original question but I used to have a Kadet Senior, Intel the wing folded right at the end of the doubler in a 60º bank turn. I would highly recommend making the main spars out of high quality spruce or poplar INSTEAD of balsa. Use the same cross section. Taper the doubler at least at a 30º angle, the more of the taper the better, my plans showed it to be blunt and that’s why it folded. I know this because of the years spent getting my Bachelors in Aerospace Engineering.

The other helpful mod I would make is giving the horizontal and vertical stabilizers more of a mounting plate then just a small stick. Also adding shear webs to the end of the fuse will help. Another alternative is installing flying wires to the V and H stabs.

I plan on building another one this winter with these mods.

Makes a great camera / video plane
It’s a blast to fly.

Here is a pic of the old plane.

SGG