Why throttle rises automatically

Hello - I'm using pixhawk with ArduCopter ver3.2 and a quadrocopter.
As an initial throttle test I did the following:
1) attached the quadrocopter to the top of a table
so that it would NOT take off.
2) increased the throttle stick on my RC transmitter up just a little bit and left the stick
in that position.
3) listened to the sound of the four motors turning. 

4) The four motors started fine but gradually started to turn very fast (even when the throttle
position was left unchanged). So fast infact 
(listening to the sound of the motors) that I had to turn down the throttle stick.

It appears to me that when the quadrocopter is not allowed to take off freely, some algorithm 
is forcing the motors to surge.

Has anyone else experienced this problem ?

The weird thing is that when I use ArduCopter ver3.1.5 with the same set-up, the surging of the
motors does not occur.

Any feedback would be greatly appreciated.
AizuCopter

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Replies

  • Iv had that happen with pixhawk and APM,although I wouldnt bolt it down, just leave the props off to test it. From my experience it seems to happen when testing the motors before calbrating the ESC. Havnt had it happen during a free flight. I assumed it was some auto throttle tuning going on.

    Did you see what happens when you bolt a Chinook down? Ground Resonance - Side View: http://youtu.be/RihcJR0zvfM
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