I am just starting to hover a + quad in stability mode. I can hover steadily for periods ranging from 15 to 30 seconds( hands off, 2-3 ft. altitude ) then copter starts to nose down, recover slightly, nose down, etc. until it hits the ground or until I cut the throttle. Once I am flat on the ground, I can take off, hover normally again and then the process repeats. Attempting to correct the nose down seems to make porpoising worse ( or maybe I am just starting a pilot induced oscillation?)
Using APM 2.5, MP 1.2.33, no evidence of prop slippage, no obvious overheating, supply voltage steady. All other responses seem normal.
What parms/PIDs do I need to experiment with? Any suggestions to explore?
My thanks to all.
Replies
Sounds like your front ESC (at least) has it's low voltage cut-off set. So as you're reducing the voltage, it thinks your lipo is dying and reduces power. each ESC is independent so they may not have the low-voltage set or there might be a slight difference in their internals which makes one sense the voltage slightly differently so it displays the problem first.
So you're powering it from the ground? very cool.
What flight code are you using? (You should be using the latest: 2.9.1)
And are you using a sonar sensor? If so, disable it for now while you're testing.