Been flying the P-40 with a Saito 100, prop, APC 15x6, for a year now. Have to use 1/2 throttle. It can do a full pattern loop with no problem. Used a Saito 90 degree adapter and a straight flex pipe. No additional holes required in cowling for exhaust. No flooding problem unless I drag the plan back nose down from the runway. Put servos inside and no nose weight required. Next to best flying airplane I have. My 1/4 scale spacewalker is number #1.
Bill PTC