Originally Posted by
nick.henderson
any idea on prop for the us 25cc? Would 16x8 be ok
Got mine mounted in a Great Planes Super Stearman. Initially ran an APC 17 x 8 which is fine but going to try a 16 x 10 as it gets more run in. Very scale like performance, ie fairly lazy and gutless, but great for stooging around. Spring starter is a nice idea and works well but no choke is a pain on an enclosed engine. Even going full throttle with ign off for a few turns will not put enough fuel into the motor to get it started. Midway through swapping the original carb for a Walbro clone with a choke.
This engine's best power range is in the 7000 rpm range so prop accordingly for the best speed range of your airplane while keep the engine rpm not far above or below 7000 rpm.