I've been flying 2.0.39 tri for a while, stable mode is very good, but there seems to be a problem with Yaw control. There is a large deadband around neutral joystick position, there is no servo movement until the stick is moved some distance away from centre. Then it will centre at either 1450mS or 1550mS depending which way the stick is moved. This effect can be seen on the bench scoping CH7 output, props off, so that the yaw gyro is effectively disabled. In reality when you are flying this badly affects yaw control.
Also I notice that the yaw servo CH7 output does not show up on the flight data/radio display, CH1,2 and 4 are there.?
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WOW. I just finished building my first tri-copter last week and was wondering what was going on... Glad to see im not alone in this issue.
I have similar issues on my ArduCopter 2.0.xx tri's as well. Have been having yaw issues for some time.
1) Yaw is very springy... when you stop a yaw it does not stop but slowly oscillates back and forth till it settles into it.
2) Yaw is as you say, there is a large deadband around center and when you do move the rudder enough to start yawing it is not smooth, the servo jumps vs moving smoothly as expected into position. My yaw servo behaves like there is something binding the servo but i assure you there is no resistance at all.
I have had the #1 issue on my quads as well, asked here a few times, researched it till i gave up and still have the issue :(
Can anybody help with this ?
Just note from me - i have got the same problem with yaw deadband on tricopter - it is hard to do gentle yaw movement with this handicap ;o(