I have the Sig Sukhoi with a BME 50 gas engine and have not had any problems what so ever.

I did not use any of the supplied hardware though and used metal gear servos on all control serfaces. Linkages have NO slop.

I added 1/8" lite ply behind the firewall and glassed the wing joint about 3" to each side of center. I got the control surfaces as close as posible and gap sealed the ailerons.

The plane came in at 15lbs, very light with a gas engine. It is a rocket vertically and the huge cowl slows it dramatically on downlines.

I added 2 degrees right thrust to the engine.

I am prudent with power in level and decending flight.

Joe Brannon