I built a 3dr frame + motor kit last week, and started testing. After passing all the standard tests, I tried a launch. The copter is not even close to being flyable due to some very strange behavior. It wants to take off to the aft left. With some aggressive right stick action, I can kinda get it into the air, but not for long. Perhaps someone can point me in the right direction.
While holding the copter in my hand and advancing the throttle to 60% (or so), I can kinda feel the copter react to pitch/roll movement, but not exactly what I expect.
So on the ground I did some static tests with the motors disconnected. Looking at the AMP Flight Data screen, the HUD responds perfectly to all copter movement. When I look at the “Status” tab, looking at the ch1out – ch4out values, I see very strange behavior as follows:
(Frame is in X configuration) If the front left motor = 3, front right = 1, rear left = 2 and rear right = 4, throttle advanced to ~50%:
At level (all 4 values should be equal, right?)
3=1556 1= 1485
Pitched up 4 degrees (front motors up)
Pitched down 5 degrees (front motors down)
Rolled Right 4 degrees Pitched up (right motors down)
Rolled Left 4 degrees (left motors down)
As you can see, those results are not even close to correct. But the the “motors” command in
CLI works fine. The radio values in status are what I expect too.
One other clue – the IMU takes 2+ minutes to warm up (able to arm). The manual says it should take
The copter is bone stock.
3DR frame + motors kit.
Turnigy 9x in acro mode with ele and thr reversed,
rev H oilpan with filter pads soldered,
Sonar and magnetometer enabled.
Running the latest software/firmware: 2.0.49 and AMP 1.0.86.
I’ve erased and reset several times, reloaded software several times and set up several times in both the mission planner and the CLI. (it’s a pretty cool system by the way!). I’ve tried leveling it in every conceivable way.
So I’m at the point where I need help with what to look at next. What am I doing wrong? What tools can I use to investigate the problem. Its acting like the motor outputs are not connected right.
Thanks for reading…..