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I think the OS.52 is a dog, but the .70 would be a LOT of torque to compensate for on take off. The miniplane is a ground-looping queen!!!
I use the Saito .56 GK (Close to the same displacement as the OS, but the power is far more acceptable.) and it has all the power I want. This plane is not 3D material, so I would never recommend that much power for this bird (the .70).
A pic with my motor!
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