Octocopter doesn't descend in Loiter

Hi guys,

A client told me that his octoX doesn’t descend in loiter mode after AUTO mission.
Do you have any suggestion?

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Thank you to all

Sorry that is the .tlog.
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What’s controlling the throttle? Because it’s doing exactly what it’s commanded to do.

Update to latest Stable Arducopter.

Hello Dave,
thank you for your help.

I think i found the problem: param PILOT_SPEED_DN is set to 0.
So basically when i put the throttle down there is nothing that tell to the flight controller what velocity set to descend.

That won’t be the problem. If it’s 0 (default) then it will use PILOT_SPEED_UP for Down also.

In firmware Version 4.0.5, that is the firmware used in the octocopter, it is not specified that if it is set to 0 than it will use PILOT_SPEED_UP for DN also.

Anyway the throttle is controlled by CH3 that worked always in loiter.

It’s the same logic in 4.0.5
if (g2.pilot_speed_dn == 0) {
return abs(g.pilot_speed_up);

And it’s default so everyone would experience a problem. But they don’t.

I wouldn’t expect it to descend with this throttle input.

ok, so that is not the problem.

But in the final part of the graph throttle input arrive at 1100 and the drone doesn’t descend

The throttle was dropped momentarily and then right back up to mid stick. I see this craft doing exactly as commanded.

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ok, so their pilot is not so confident in piloting.
Being a drone of one of my customers I was immediately alarmed.

Thank you again for your help Dave.