Hi there!
my 3DRobotics Arducopter with APM crashed yesterday. Nothing broke at first sight (two props died) but now it's doing strange things. When I try to lift off it leans stangely to one side. I can get it in the air but it floats around like crazy. When I start the motors, at about 5% throttle one CCW motor spins, a little later the other CCW. At about 8 % throttle the other two CW motors start spinning. (see the youtube video!) Whats wrong? Soldering maybe?! I did ESC calibration - still the same. :( One motor does vibrate but this should not be the reason for the motors to not start together.
I postet a video on youtube so you can see what the effect is:
https://www.youtube.com/watch?v=RFqGivWWh1k
Thank you!
Joerg
Replies
Thanks for the quick response,
I removed the props, and balanced the motors. Now there is hardly any vibration in the system. (I did fly before with really bad props and vibration, but I never had problems.)
Anyway - What else I did until now:
1.calibrated ESCs (I hope I did?! - Full throttle up (Ch3), power on, beep-beep, Di-da-di-da-di, throttle down, disconnect)
2. flashed new firmware.
3. checked sensor response in APM Planner. I can see the data produced by the sensors, but if what I see is cool?! I don't know. Looks alright. (what is a healthy gyro datastream?)
4. with no props I checked the copter response in STABILIZE mode. I reacts strange...e.g. when I tilt it around 45 degrees, one Motor does even stop. :(
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what I will do: Check all my Soldering (oh F**K!)
Thank you very much, guys! I'm really desperate.
Joerg
Connect it to the APM Planner and check if the sensors are responding ok. This seems a hardware problem, it happens to me a lot of times after a hard crash: a gyro looses contact to the board and then AC gets crazy. Then I have to reflow the board with a heat gun and an infrared thermometer to control the temperature limit.
You may need to recalibrate your ESCs after a bad crash. I've had them loose calibration like that many times.
Also check for increased vibration due to bent motor shafts, prop adaptors.
Also, make sure you have soldered the low pas filter pads on the IMU as per instructions in the wiki.
Jason
Hi,
I am sure that your issue is with vibration. The vibes are causing the IMU to think it's tilted. Either try to straighten that motor shaft or replace it and you should be good. If the shaft is good, are you trying to run crashed props? Either way, eliminate the vibes and you should be good.