Had one with a Saito 100 on the nose. Had to add 11 oz of lead even with the heavy engine to get it to balance and the covering is very low temp stuff, so be careful when you de-wrinkle it or you'll burn a hole in the covering in a heartbeat. Had a bit over 100 flights on it when the horizontal stab failed during flight. Was a great flying airplane and lots of fun while I had it and the lead in the nose didn't seem to hurt the flight characteristics. I'd brace the tailfeathers if I was to do it again.