RE: Engine for a four Star
Matt, a 10-6 is pretty light -- it is really a break-in prop for for an AX engine. At full throttle, it will be turning close to 16,000 rpm in flight -- lots of noise, lots of wear & less performance with that airframe than could be achieved with a better prop match. An 11-6 is a good choice for that plane & engine combo. If you are concerned about excessive airspeed, & IF you have sufficient ground clearance, a 12-4 is also a good choice -- that would easily give you unlimited vertical, but limit top speed to somewhere between 50 & 60 mph.