02-28-08 05:04 PM - Post#86460 In response to jetss
Here is a start.
With TX ON only:
Put TX rudder travel adjust at 60 on both left and right stick adjustments.
Gyro Menu shows gain at 64 on 1 switch position and maybe 60 or so on the other position as you flip the gear/gain switch. Next look at your rudder digital trim lever and make sure you are at ZERO with the hash mark in then center on the TX screen. Flip to ID stunt mode and check then HOLD as well. Make sure the hash mark is centered on the screen when you flip into these modes.
Next go into sub trim and make sure the rudder channel has NO sub trim number. Shut off TX.
Remove plug of t/r servo plug from the gyro. Go to channel 4 of your receiver and unplug gyro and plug in the rudder servo along. Now turn on TX and plug in heli. You may want to disconnect the motor to be safer...your choice. With the rudder stick centered look at servo horn on servo. Move the rudder stick to see servo move. You can check for binding this way and check for the center. I recommend that you put the servo horn on the servo with the horn facing SLIGHTLY forward. You could put it at perfect 12o'clock with the TX stick centered but you will likely see binding if you move the rudder stick. Advance the servo horn 1 tooth or slightly forward to put the horn say at 11o'clock vs. the 12 for perfect vertical. Now with TX still on and rudder servo horn at this slightly advanced location look at your t/r pitch slider at the rear of the heli. Adjust your t/r rod length so the SLIDER on the t/r output shaft is almost centered as it travels on the shaft. You may need to lengthen or shorten the rod. OK not a problem just remember to have the TX on and your servo horn in the slightly advanced position.
Now shut off the heli. Reconnect the gyro to channel 4 then the servo to the gyro.
Make sure to reconnect your motor if you disabled it.
You should be very close to now have a good flying tailrotor on the B400. You may need to adjust your gain a little but it should be very close. ALSO if you notice the t/r servo creeps a little you could NOW go into the sub trim for the rudder channel and add a few numbers to help stop it. I usually HOVER the heli and make this adjustment. IF you add a number and the servo moves faster you went the wrong way...remove the number and add some the other way. Same as if you hover...if it moves/yaws more...take the number off and go the other way.
You could use the rudder trim but that is not as fine an adjustment as sub trim. PLUS sub trim work in all flight modes where as rudder trim is separate...so you'd have to adjust your rudder trim lever in each mode...normal - id - hold. Your choice.
aka - GMRO
Edited by GMRO on 02-28-08 05:05 PM. Reason for edit: No reason given.