I finished my build last weekend.
-TBS style frame
-APM 2.6
-Sunnysky V2216-12 800KV motors
-Hobby King 30A Blue ESC (f-30)
-GPS-6M+HMC5883L Compass module
-3s 5000 mah 20c LiPo Zippy
-3DR Power Module
-Hobby King Orange receiver and Futaba T8FG Super transmitter
The issue I am having is that immediately upon take off the quad spins out of control.
The steps I have taken so far include:
- Ensuring motors are securely fastened, prop installation and prop directions are correct
- Re-installing the firmware on my APM 2.6 (many times)
- Re-installing the firmware using X style frame type (where I was using the "Spider" style frame before)
- Resetting the APM in the CLI and re-installing the firmware
- Calibrating the ESCs together
- Ran the Test>Motors in the CLI to ensure that I have the motors hooked up properly
- Ran the Test>Compass in the CLI to ensure working compass as well as the GPS
- Adjusting the trim via my Transmitter (I can get it to spin the opposite direction but doesn't settle out)
- Using the "Save Trim" setting in the Extended Tuning menu to try to trim out the spinning (same outcome I can over correct, but not correct the issue)
Today a friend gave me a tachometer and I noticed that at 50% throttle both of my counterclockwise motors seem to spin at about 1.5-2k rpm faster than the two clockwise motors. I ran this test about 3 times with the same results.
I also ran the ESC calibration and noticed that when I am at the part of the ESC calibration where the motors power on all of them seem to run at the same RPM at about 30% and 50% throttle.
This leads me to believe that there may be an issue with my APM 2.6. I was wondering if anyone had any ideas on this. I am new to builds, have about a years worth of experience flying a RTF quad, don't rule boneheaded mistakes out :)
Thanks much!
Jason
Replies
I meant to say gyro gain in the above post. At any rate didn't do it because I couldn't find a way to do it haha.
Compassmot = 6% (checked that today)
Going to try tuning the PIDs next. I read that it helped some other folks stabilize their birds. I will post what I find.
Thanks! I checked around the settings on my transmitter for any remaining trim adjustments I had made previously. I didn't find any in the 'sub trim' menu or on the main screen. I re-calibrated the radio via Mission Planner - if the values work like i think they do: for the yaw i get a min of 1100 and a max of 1942, right in the middle of those values is 1521 and that's where it's resting (it jumps between 1521 and 1522 a little), but that should effectively be 0 yaw - that makes sense to me not sure if it's right.
I'll have to try it in the morning. If that doesn't help I might make another profile on my transmitter to make sure that I'm starting with clean settings.
I'll post my findings. Thanks for the tip about not using the transmitter to trim out the quad. It makes sense.
J
Might be my imagination but It seems like it helped a little. Still spins clockwise on take off though.
Not sure on what to try next other than replacing the computer. I bought parts to replace motors and escs because i thought that was the original problem, but seeing that the two cc props and the two ccw props are spinning with the same RPM this makes me think the motors/escs are fine.
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