Sudden altitude bump on our quad copter

sauravhobyy · March 30, 2024, 6:02am

Hi

So we have a payload drone which drops relief material of about 10kgs.

Today durning a Traning flight to new pilot we had plans to takeoff without any payload.

Upon arming the drone in loiter mode and centring the sticks the drone after that immediately bumped almost 18meters and then immediately got the drone safely to ground.

What would be the reason for this sudden bump ?

Can we not takeoff without any payload because at times there are problems to put dummy payload durning Traning flights .

Bin file - 2024-03-30 10-20-07.bin - Google Drive

amilcarlucas · March 30, 2024, 9:39am

How good is the pilot?
Can he operate in stabalize mode?
He should, because then he would be able to operate the vehicle regardless of payload weight.

Janno · March 30, 2024, 10:16am

First of all, upgrade to ArduCopter 4.4.4 (or 4.5 hopefully next week).

Second, given the data I think it’s safe to say the drone didn’t expect to be able to climb this fast.

Altitude exceeds target altitude, vertical velocity exceeds vertical target velocity and vertical acceleration exceeds vertical target acceleration.

plot-beta

It becomes even clearer when you plot only the differences and not the absolute values:

Last but not least, with such a big drone you really want to do IMU temp cal and compass motor calibration (MagFit). Consult the methodic tuning guide, especially section 2.1 and section 4 for more info.