How do you pick an electric motor for a freeflight model? Since the prop and battery are vital components, this often asked question really should be: How do you select an electric motor system for a model? A low drag, sleek model will require less power than a draggy biplane. On the other hand, a light, low wing loading model will require less power than a high wing loading model. I like to think in ounces per square foot, although I take measurements with a gram scale and compute area in square inches. If you multiply grams/ square inch by 5 you get ounces/ square foot.
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