tail creep different on boot up, depending on init tail servo position

[nyc_863]

I have noticed an odd thing .. when I boot up the gyro and let it arm, the tail servo flicks the slider to approx center, then some creep starts. The odd thing is the creep is different (in speed, and even direction) depending on where the tail servo was when I power up the heli !! most previous flights my tail servo arm was about 90 degrees but sometimes not, due to whatever. Some flights felt locked, others felt awful (multiple clicks of rudder trim required), and something felt inconsistent.

But now I make sure BEFORE powering up that the tail servo arm is 90 degrees and tail slider is mid position, and power up, then make sure any creep is v slow if its there. As others have posted there some tail wanderings during spin-up, but even before it gets light on the skids the tail just holds without rudder trim or corrections and I know the hover is going to be solid. If the tail starts to feel like its in rate mode and needs rudder trim as well, the reason so far has been fast creep after power up, in which case it needs slight sub-trim adjustment, which I do, then reboot with tail rotor re-centered again. I think currently my sub-trim is a tiny +4 or something.

I feel like this startup routine borders on superstitious because I don't know why tail servo position on startup screws up previously ok sub-trim, but it does for me anyway.

So now I just ran through two packs, I got 8 minutes of flight, in ground effect, on each, and the tail needed a prod to bring it back to dead on maybe once a minute, while I slid it n s e and w... Ok so this isn't a stress test of HH such as 3d flight and the G101 might still be poor quality for great pilots but for hover practice I'm quite happy, it matches my only other experience (Reflex) now.

Something to try, anyway. If this is a common issue perhaps it explains the trouble people seem to be having on some flights and the difficulty diagnosing it? But I don't know if out of the box the blade had this behavior. My gain pot is at 100% and I got rid of the excessive tail slider travel that was causing buzzing at both ends.. So I'm not as it was from the factory.

[widower]

It's also important to make sure the rx initializes before the gyro. I've had to re-apply power the odd time because the gyro initialized first.

[JKos]

The only thing that doesn't make sense about your observation is that the gyro has no knowledge of where the servo is. It tells the servo where to go, but does not know where the servo really is (at any time).

- John

[nyc_863]

I quite agree .. it doesn't make sense as you say, the gyro shouldn't know where the arm is.

However my eyes don't deceive me. Boot it up with the servo at max extension one end, and the creep after centering is very different from the other end, and the heli doesn't feel locked unless it was booted mid point.

I boot it up with a centered servo and the creep isn't there (if I sub-trimmed it there) and the tail feels locked.

I know it doesn't make sense but it is repeatable. Even with throttle hold on, sitting on the desk, it is repeatable..

Test it out on your b400 .. first you need to eliminate creep. Then repeatedly reboot from different servo positions and observe whether your adjustment is still correct or the creep is random on every boot up, or appears to be a factor of initial position as it is for my heli.

[JKos]

I just tested this theory on my B400. Powered it up a number of times with the tail servo in different positions. Absolutely zero difference.

- John

[Raven_darkcloud]

The differance you are seeing is temp related. On cold days you need to let the gyro adjust to the temp. This is after all a relabled telebee. Let it sit and aclament a bit then power it up let it sit again. Power down and then back up if you have creep cycle between rat and hh. if you need to add any trim shut down the heli center trim and subtrim repower and adjust to remove creap.