So, Alladin,

Help out Bruce and Britbat by further defining your engine.

IMHO, if it is a bushing OS, LA or FP, I use 11 X4. If BB, FX or SF, 11 X 5 is good. That will give you thrust.

If you are looking for speed, get another airframe. On something like the Viper ARF, you can use 9X 6 and go much faster than with the Superstar.

Good luck.

Heck of a deal to be missunderstood in one of these forums.

Ken, AMA 19352