Futaba GY701 Quick Start - Manual (Page 16)

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The tail rotor ratio, tail rotor pitch range and tail
blade length play a large part in achieving optimum
tail rotor performance. The gain value can vary
drastically from model to model and the exact value
should not play a part in the evaluation of the gyro’s
performance. How the gyro operates during fl ight
is the only concern of ours.