I'm running the APM2.5+ with Arducopter 2.8.? (The version before 2.9)
My Radio is a Spektrum DX8.
All of the radio calibration went fine, but I noticed at the time of calibration that the throttle 'green bar' would randomly blip up to half throttle (or if it was at half it would blip up to full).
At the time i thought maybe it was just because i was inside and usb tethered.
Motor testing without props though verified that occasionally the motors would briefly double speed then drop back to idle or half speed. this was random again, no pattern, once every 5 to 15 seconds.
Fool that I am i thought maybe somehow attaching props would solve this issue, but again, at idle the motors would pulse enough to just lift frame, or if I was almost at takeoff speed the frame would jump up and flip.
I've noticed one issue of uneven thrust front to rear which I think is due to different quality props (front coloured ones appear stronger).
But the throttle pulse/blip thing is my primary concern.
Has anyone else experienced this?
I saw a thread somewhere about flashing the 32u chip to help it keep up with the high speed of futaba 8 channel sets, would the same fix help me? I am only skeptical about that fix due to my board being so new surely it has the latest file in the 32u chip? (The post about the flashing was from 2011).
I've ruled out the tx or rx being the issue as the motor speed is completely stable and constant when powered directly by RX,
SOLUTION (SO FAR)
Changed data rate to 11ms instead of 22ms, the throttle blips have disappeared in the 5 min test i did in the workshop, more tests tomorrow to get conclusive results, but it's looking great so far.
Many thanks to J B for suggesting this fix.