Sometimes a little flex in a propeller is just what I'm looking for, especially in the profile and hang on the prop arena. It's sort of like a stall converter in your car, or running in second gear to get around a certain obstacle. The difference between climbing out of or stayin in a hover is a hundred rpm or a little flex sometimes. The bigger engines may not follow the same rules. On my Aeroworks Freedom I run a Moki 1.35 and like a wooden prop