Bruce:

Seeing his picture I agree 100% on his wing tip destabilizers. Rip off what you have there, Dago, and replace them with flat plates extending from the LE to the trailing edge of the ailerons. Make then exrend no more than 1/4" to 3/8" above and below the wing. I think you'd probably be better off with nothing than what you have.

And Bruce, "Right again, Robin," it's the fin gusset I was talking about. If the correction of the tip abomination doesn't take care of the problem, add the gussets to the stab. With those instability generators off the tips shouldn't need anything else.

A twin with those fences, rather lose my senses.

Bill.

PS: Dago, the original are called "Hoerner" tips,wr