PHOTOGRAPHS BY PAUL TRADELIUS For those of us who enjoy flying helicopters, we have a lot to choose from. Small micro helicopters are perfect for indoor flying while the larger, .30-, .50- and .60-size gas and electric helicopters are suitable for both sport and 3D aerobatics. For those who want to get the best performance from a nitro helicopter, however, the .90-size provides the greatest power-to-weight ratio, with more inertia in the rotor system for...
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