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Knowledge base Quark Installation & setup

Question #3
Is the gain of the tail gyro too low?
Answer

The optimal gain value is a function of several parameters including rotor speed, tail rotor diameter, tail blade efficiency, servo arm length, servo make/model and mechanical design of the aircraft. As such, it is not possible to make a general recommendation and the gain will need to be adjusted experimentally. Starting with a gain of 30% should provide enough stability to at least hover; however you should always proceed with care. If insufficient stabilisation or tail wag is seen the gain should be raised or lowered respectively. The optimal gain value is the highest value you can reach that does not cause tail wag at any time during flight.

It is not uncommon to find that the optimal gain value for a helicopter may be a small number such as 35-45%. The small value does not mean that the gyro will be limited in performance. Any gain value performs well as long as it is the optimal gain value. However, a gain below 30% indicates that the mechanical gain of the tail is too high and it is therefore recommended moving the servo arm ball link further in. Similarly if 100% is reached and no tail wagging is seen the ball link needs to be moved further out and repeat the gain adjustment procedure. The previously indicated 30% is for guidance only. There are significant variations in the tail design of helicopters and in some cases it may be deemed essential to use a value below 30%.

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