Just one thing to mention her to the NO Gyro guy's, ME in 1972 flying a Schlueter 60 size Heli without any help of any Gyro and only with fixed pitch and bell crank tail mix with a Simprop Super 7 AM (no rates) proportional Radio system flying the crapp out of it ?? I did the R.T.F.I like i still do these days and use any help i can get, It works too every time i do that !