Translations:Help:FAQ:Gyro/3/en

My gyro gain seems to be very low. What is the best gyro gain value?

The gyro gain value is just the amount of servo deflection the system will add to the rudder servo during one control loop process. So how much gain is needed highly depends on your mechanical servo throw. If the tail pitch makes a huge step even at very little servo throw, then you will only need very little gain. If you have very a short servo arm and/or very long tail pitch control arm which allows to control the pitch in very little steps, you will be able to go very high on gain setting. So from an absolute point of view there is no good or bad setting. Set the gain as high as possible and as high as necessary. When gain is too low in general, the rudder won't be held in position properly. If gain is too high the tail will wag and osscilate quickly, as the servo is making too much pitch deflection and the gyro is overcompensating. Usually you will end up with a gain setting somewhere around 50% as most helicopters have similar tail mechanics in regards to tail pitch throw. But having a different value is no reason to worry about as long as the tail is held in place by the gyro properly.

If you can't find a good setting in between "too high" and "too low" and you have a very low gain value this may be a sign that your servo arm is too long and thus the servo stepping is not precise enough. In this case move the tail linkage closer to the servo center position (shorter servo arm) to get a more precise servo stepping. As a result you will have to increase the gyro gain but also you will be able to adjust the gain more sensitive.