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Knowledge base Quark Common problems

Question #120
In rate mode the servo is very quick but in heading hold mode it is very slow.
Answer

There are substantial differences in the operation of rate and and heading hold (AVCS) modes.

When the gyro operates in rate mode the rudder stick signal from the radio is mixed with the gyro sensor and is passed to the tail servo. Therefore the servo will instantly respond to rudder stick changes. If the rudder endpoints or dual rates are reduced on the radio the servo travel will also be reduced but it will always instantly track stick movements.

In heading hold mode things are very different. The microcomputer inside the gyro is now in charge of the tail and will keep it stationary or yaw it at a specific speed as instructed by the pilot; this command comes from the rudder stick. If the rudder endpoints or dual rates are reduced on the radio the servo travel will not be reduced. Instead the pilots command to the gyro is reduced resulting to slower yaw rate. As the gyro now makes all decisions, based on the current configuration the gyro may decide that it is not necessary for the servo to move fast. This slow reaction speed may also be the result of very low gain setting.

When bench testing heading hold gyros the behaviour will often appear odd. If this is your first heading hold gyro it is best to seek the advice from a proficient pilot in your local area. Also remember, the tail servo endpoints mush always be set on the gyro. The rudder endpoints on your radio don't control servo travel; they control the maximum yaw speed.

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