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Knowledge base Quark General

Question #119
Can over-adjusting the gain cause the tail gears strip?

The gyro has a task to perform which is to maintain control of the tail and yaw in direct relationship to the rudder stick. This task can at times require a lot of mechanical effort and your helicopter tail needs to be suitably designed to survive burst of the tail rotor pitch reaching full travel.

The gyro can only achieve its full potential when the gain is set the optimal gain value. If the gain is too high tail wag will be be observed in flight either continuously or typically during high speed manoeuvres. In the case the gain needs to be lowered until the wag is no longer seen. If the gain is too low the result will be poor tail hold including bouncing at stops and kicking out when full collective is applied. As such it is not a good idea to reduce the gyro gain in an effort to lower strain to the tail mechanics as this also makes the gyro respond slower.

The correct ways to reduce mechanical strain to the tail are:
• Don't make sudden changes to the rudder stick. For example don't try to abruptly stop the helicopter when it is pirouetting at two turns per second.
• Lower the Acceleration and Deceleration parameters via the computer software or DataPod. This will ensure that the helicopter performs progressive and controlled piro starts and stops even when the rudder stick is moved rapidly by the pilot.

Also it should be noted that some helicopters offer an excessive range of tail pitch adjustment. You should adjust the gyro endpoints so the tail pitch range stays within the helicopter manufacturers recommendations. If you allow the gyro to use more tail pitch the tail mechanics will be subjected to forces higher than the manufacturer has accounted for.

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