If/when I do build another Compensator, (I had 3) it will have a 4 stroke and retracts. I know that excludes me from SPA but, Oh Well. I curently compete in F3C and get plenty of
Actually you would be legal, you simply do not use the retracts. It will slow the plane down, but not as much as you might think, and of course you may need to retrim.