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Even the instructions that come with this engine and any experienced flier that you ask, will tell you that the right prop for your trainer, with this engine, is an 11x5, or an 11x6.

That screaming you hear is the engine not getting a 'good bite' of the air and unlike some pylon racers, your model flies badly with that prop and not even particularly fast.

Put the much larger prop on it and let the engine use its torque and do what it was designed to do, to make that trainer easier and safer to fly.