Whew!!! A 50cc Echo on an 11 lb. plane? Well, you will definitely be using that left stick on the radio! It will probably take off at 1/8 throttle.
A bit of overkill really. That engine will probably have 25 lbs. plus of thrust. But hey, like my signature says, "If it isn't scary, it's nowhere near powerful enough....."
AV8TOR