Here she is testing hover stability and yaws of a Coaxial RC Helicopter modified by removing the flybar. Stability is maintained by using two rate gyros added on the aileron and elevator servos. The TX parameters were carefully trimmed. Testing Piro balance (Clockwise and counterclockwise). Because there is no flybar, the upper and lower blades almost have identical weight making yaws / piro rates the same in any direction
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