My old and over used original Tutor flew great with a Brodak .40 on muffler pressure and swinging an 11 X 5 prop and sometimes an 11 X 4 narrow blade prop. I put on over 375 flights before it met its end! A real fun flyer and from time to time competitive. Add wing tips and try to keep it light. I have my doubts about the FP .20 but I could be corrected / persuaded to relent I have used this engine on many Ringmasters and Mustangs as in Sterling kits! The Brodak versions fly better because they are lighter!
Phil Spillman