Just got a 91FX and noted in the manual that 6 different props are suggested. Kewl that so many are recommended, but them suckers are fairly expensive. I don't feel like doing the old "try every prop possible and pick the best" dance.

Once upon a time, if you had a .35 engine, you couldn't go wrong with a 10x6 on it. Is there a prop size or two that're like that for a 91??

The manual shows a 15x8, 16x6, 16x7, 16x8, 17x6 and 14x7(3blade) as suggested for sport flying.

BTW, that 14x7(3blade) seems too small. I figure a 3blade might be in the cards since the 91 is going on a 60size airplane and those size airplanes were mostly designed for 13" props. I can't see swinging a 16" on a design that just clears a 13", and REALLY can't imagine a 17" on the same.