"Thanks Randy,

I think you're referring to the sampling rates there, whereas the actual bandwidths of those IMUs are even lower than that.

Also, the correct mounting of an IMU in an autopilot has an opposite goal to the one of the VTrack: An…"

"Darius,
Let me disclose first that I'm Phil's partner in Fly By Night Systems LLC.
I think you make some interesting points but there are some misconceptions also:
- Most accelerometers that you'll find in an autopilot or in a cell phone have a…"

"I attempted to autotune today.
The left-right part (the first half) was normal. During the forward-backward (second half) phase and in particular during the forward movement, I noticed that right after each oscillation the copter was adding a…"

"Leonard,

Is there a dev mailing list where this is being discussed in more details?

Thanks

--Alex"

"Leonard,
If the accelerometer is saturating, how do you possibly see the spikes that we see on landing etc? I wouldn't think the range could be that limited
Is what we get in the log file the actual output of the accelerometer or is it a filtered…"

"Leonard what was it? I've been battling with this problem for the past three weeks.
Are you saying that it will be fixed in 3.3?"

"Thanks. 
I thought the spikes would be actual changes in direction, but I guess a wire might be tapping the FC in some way also.
Monday I'll fly with the canopy plus there's almost no wind in the forecast. We'll see if the problem is there again."

"I've attached the .log, I'll take a picture in a bit.
I had aligned the motor mounts to be perfectly horizontal with a bubble lever just before the flight, so no I don't think that's the problem if that's what you mean.
[EDIT] The .log is 8.1…"

"I have swapped in a spare pixhawk (brand new) and the sudden jump in relative altitude that I've seen at boot went away. I had tried completely wiping the old pixhawk parameters to default before going for the swap and that didn't fix it.
I think…"

"The 'miscalculation of relative height' though has been a constant for the past few days. Here's another log of another test I just did, same problem, same rough landing. I did another test because I eliminated what I thought could have been a…"

"Swapped in the new Pixhawk today, it flew like it's on rails.
I wonder now how much of the past couple of months I spent fighting windmills given the IMU issue.
Well it's great now. Thanks again."

"Nope, no digital servo connected to the pixhawk, only ESCs. Good tip though."

"Ok, I have the RMA going and I overnighted another one so that I'm not grounded during the duration of the RMA (Always good to have a spare anyway). If this is not covered during your manufacturing test, is there a good burn-in to run to see if the…"

"Craig,

Thanks, I've started the RMA procedure.
Not to doubt your information here, but why did this not happen with 3.1.5 then? It only started happening to me when I switched to 3.2 (and judging from some other threads this happened to a number of…"