Test fixture is a table with four strings attached to each arm and threaded through the table. At the end of each string is a 51g spool of wire. So the vehicle is effectively bound in a fairly small area and if I ever get into trouble, I go to max throttle which maxes-out every string.
Here’s what I see:
Copter comes off ground cleanly (doesn’t try to flip as if props were rotating incorrectly)
But does begin an almost immediate drift once it comes off the ground. If it weren’t in the test fixture, it would just take off laterally
It has an almost violent side-to-side instability
To land it back on the fixture, I basically have to catch it on a favorable side-to-side oscillation and just cut power so it flops back down
So I watched a youtube video on tuning in a fixture and got very reasonable P & D values. As the video recommended, I left I and 0 and “headed outside!” (that’s what the tutorial said).
I armed the system in stabilized mode, popped it off the ground and it immediately started drifting right into a fence and broke $76 worth of carbon fiber propellers.
I even duplicated the fixture from the tuning video and experienced all the things it pointed-out (i.e. tremors with values of D too high, sluggishness with P values too low).
But once I headed outside, it’s like the quad had a mind entirely of it’s own.