Odd throttle response, almost like fuel starvation. CC3D

[Airwave45]

I know it';s not, fuel starvation, but, it does look and feel like it.
It if was a carburetted petrol engine, I';d have the fuel lines and filter off.
The quad will run at 30% throttle smoothly.
Once it';s over 40% it surges like a bugger. Does it on all the batteries I have.
from 40 to 60% it runs in fits n starts, over 60% it';ll intermittently spool right up to full power but still surges.

at lower percentages, there is very little voltage sag on the batteries, at full welly, it drops 2 ish volts on peak voltage (recovers immediately the throttle is closed)

Is it a CC3D calibration issue ? seen it before ?

[Airwave45]

For future reference, should anyone else get this.

Set up is.
CC3D
4 ESC';s with ESC 1 (front left on the CC3D) with the power wires left on from the BEC back to the CC3D and the other 3 ESC';s with the power wires snipped.

The No.1 ESC (supplying power to the CC3D) was misbehaving over about 45% throttle.
It seemed to be "Surging" over that throttle setting.

Figured that out  by holding the quad at 35% throttle and rotating it nose up.
the aft 2 motors spooled up hard and did not surge (aft 2 ESC';s ok)
Roll it left, surged badly.
Roll it right, both stbd motors spooled up, no surging.
Pitch it forward, surged badly.

any roll or pitch taking load off the port fwd motor let the motors spool fine.
any roll or pitch asking the port fwd motor for more load led to surging.
as this was the one supplying power to the CC3D, it seemed to lead to the whole quad loosing power.
and then the FC noticing and putting in a blast of throttle when it could.

Changed out the port fwd ESC, whole thing smoother than a babys bottom.

Happy dayze.

[kilby]

Glad you got that working as I know nothing about the cc3d controller i didn';t want to throw in random speculation

[Airwave45]

I';m very glad to have it sorted too !
burned through 4 motors and 6 ESC';s through stupidity (mine)
Have had 4 FC';s on this board, of which 2 have positive faults.
Have had to resolder the PDB lots though lack of skill.
Changed the power lead to the PDB to use different battery plugs
then had a dodgy ESC.

Get your lucky white heather here !

Unbelievably frustrating, and been going on for months.

Tonight, when it flew in the garage, stable, quiet and just reeking of power, I was a happy happy bunny.