I’m trying to get a new F450/Pixhawk quad flying. As soon as it takes off, the quad spins on its axis at a rate of roughly one revolution per second. Pushing the yaw stick in either direction doesn’t have any effect that I can notice. The PIDs are at default values, but even so, the quad shouldn’t be this unstable, right?
I’ve calibrated and re-calibrated everything, including the radio. I’m using the u-blox external GPS/compass on a mast. Radio is FrSky Taranis/Delta-8. I’ve tried the compass interference test which seems to be OK.
I’m attaching a log of my short test ‘flights’. In the first flight I applied no yaw. In some of the subsequent flights I tried applying full left/right yaw. I also very briefly tried switching to Alt Hold mode which didn’t seem to have any effect on the yaw. Pitch and roll just added to the instability which I guess would be expected.
Examining the log, the only strange thing I’ve noticed is that desyaw oscillates along with yaw. Shouldn’t desyaw remain constant, seeing as I have the yaw stick centered?
If anyone can spot any clues as to what might be going wrong I’d be very grateful.