First autohovering test ...still a bit of vibrations on vertical plane
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First autohovering test ...still a bit of vibrations on vertical plane
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Log file
2014-09-04 10-46-38.log
Better to wait Robert opinion!
I always wondered if it was my ESC pulsing causing this twitch. I am using a YGE 120 ESC which seems a little outdated when it comes to programming.
What would cause channel 4 to be giving outputs like this?
ESC pulsing would DEFINITELY cause this problem. It would be interesting if we could have motor Amp data, and see if there's an amperage oscillation which correlates with the tail oscillation.
However, it can't just be that, as other helis using other controllers, don't have this problem. Ok, I have heard of this problem, with other FBL Controllers, but guys have managed to tune around it. I'm assuming you've tuned the governor PID settings in the ESC? If not, you should try.
But there is no question, I am not personally happy with the yaw control of tradhelis on Arducopter. It's just not good enough. I'm hoping to have a lot more time to spend on it soon, and I'll be going after it.
I have tuned the ESC PID setting over and over and still haven't found a sweet spot. In the manual it says that with larger helicopters you can pretty much max out your P and I settings.
I recently ordered a Kontronics ESC because I think they are so much more reliable than any other ESC out there. Had a YGE shut down on me a few months ago it sucks because its such a huge failure point. Luckily the autopilot pretty much kept it level all the way to the ground.
Even though the tail is spinning around 5500 RPM the tail still seems very solid I think it helps that it has 155mm tail blades. We used to run the SAB 130mm tail blades and they seem okay just not as crisp. I might try going back to the SAB tail blades when I get the new ESC for testing purposes.
Yes very similar.
Maybe try to have a closer look at your carb needles (both L and H) and tail rotor servo, in the past on another helicopter I had same issues with Align 650 servo on t/r, engine running very good and tail still wagging (several trials with PID).
Just moved back to Graupner servo (less speed), problem solved.
My Helicopter is electric. So you went to a slower tail servo and that solved the issue? I also think that the ESC may have something to do with it. It's a YGE and I think it's sending a pulse which is making that tail twitch.
Sean, PID of my t/r are: P=0,09 I=0,08 D=0.
Currently I have onboard a Graupner DES 707BB digital servo on the tail rotor.
Maybe my tail servo is to fast? Im running a Savox 2272 @7.4 Volts which is Speed(@7.4V sec/60): .032.
Looking at your tail servo it's pretty slow compared to the Savox 2272.
What do you think?
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