Two Stroke

OS 55AX over a Magnum .70FS any day of the week and you will have a better performing airplane as well as an engine that is way ahead in terms of repeatability flight after flight Plus you will find the extreme slant needle with the long flex cable included with the engine makes tuning a a joy instead of a fearful experiance.


Notice the needle valve on the cable on top of the cowling slanting to the rear on my little Ultimate china arf. The engine is 55ax. There is no way I would trade that engine for any four stroke that would be practical in that airplane.

Also yes the Magnum 70FS could certainly be used however you might have to change the throttle pushrod positioning and or change sides with the throttle servo. Along with possibly some minor modifications.

Not everyone thinks four strokes are the best in every airplane even if four strokes are the only way to be politically correct these days. Nope not everyone.

John