Can I use rudder trim
==============
If you are using a heading hold gyro then the quick answer is no. The reason is that heading hold gyros are looking for a centered command from the radio to keep the helicopter from rotating. If you move the rudder trim a few clicks one way or the other then a gyro in heading hold mode thinks that you wanting it to spin in that direction.
Example: Say you have switched to non-heading hold mode and the helicopter is rotating left so you add a little right trim until the helicopter is still. Now when you flip back to heading hold then you will find the helicopter now constantly rotates to the right.
So how do you make it so the helicopter is trimmed in both heading hold and non? This confuses a lot of people because they often do the setup out of order. The first step is to center the trim and zero the sub-trim. Next with the gyro in heading hold mode adjust the sub-trim so the helicopter does not rotate. Normally this should be zero but due to small differences in the radios as well as some gyros you may find you have to adjust the sub-trim. The next step is to switch to non-heading hold and if the helicopter drifts, then adjust the rudder linkage. If the helicopter is drifting left then turn the link clockwise, opposite if drifting the other direction.
那麼, 可否說, 遙控器的 trim (rudder) 及 sub trim (rudder) 功能, 對直昇機來說, 是完全沒有用處的.
如果調整了, 就會像文中舉例一樣 "...Example: Say you have switched to non-heading hold mode and the helicopter is rotating left so you add a little right trim until the helicopter is still. Now when you flip back to heading hold then you will find the helicopter now constantly rotates to the right."
