RE: Futaba 3305 Servos
I use them in F50X. With great luck. I did loose a F40 because one went bad on the rudder. This however was the result of many hard landings that stripped the gears. Once I started using them a few other guys I fly with came on board. They have them in a Showtime and a F90 with no trouble.
The down side. These are strong servos not precise servos. We are using them to bang the sticks doing 3D. If you want to do some pattern or IMAC. Think about a better servo.
David