RE: Good .40-.50 engine
I find my Tower Trainer flying in a similar "jerky" fashion where the .46 FX engine is pulling the airframe around behind it rather than the plane flying on the wing like a trainer should.
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One thing a lot of people forget to use is that amazing thing called the THROTTLE - WOW you pull it back a little and that thing will slow down. Amazing. We have one in a Eagle 2 & at 1/2 to 3/4 throttle it will fly on the wing like a trainer.