Trim vs.?

Archive
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Hey guys, I am still have a problem where stock params have my Iris pitching forward a bit. It’s maybe 15%, It also rolls right slightly, maybe 7%, and this is with ZERO WIND… It’s enough to make it really hard to use STB mode.

Does this mean something is wrong with my props?

If I TRIM it out, it fixes it instantly. I have to trim the pitch maybe 5 clicks, and the roll I think 3.

But I know NOT to TRIM, so I wonder what I can do now?

I did do the Accel Calibration, but I thought I did it wrong and so I reloaded Stock Iris Params - not sure if this overwrites calibration or not though. I was not confident what I did was correct, it seemed so haphazard as it lays on its frame edges, and I am not sure those are perpendicular and flat.

Also, one time when I landed kind of hard (not really) the motors cut out and it just beeped at me. Then it beeped periodically. It was solid green light (GPS OK; ARMED) and the motors were not spinning, and I could not arm or disarm it. I turned off the safety and turned it back on (solid again) and it still wouldn’t let me rearm. This happened twice. Unplugging the battery fixes it though, of course. I had enormous clouds moving in and poor HDOP enough that I couldn’t use LTR. Any ideas what mode it got stuck in and how to reset it from there?

Thanks in advance!!
Kevin

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logs???

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I have the same issue on the pitch forward. Have been reading about the save trim and auto trim but I was hoping someone from 3dr would address either in my thread or this thread.

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Loading the Iris param file does not reset the accelerometer offsets. You need to do that again yourself. I have glued a small bubble spirit on my quads and Iris so I can get exact level (glue just near where the antenna come out the back)

you can trim your craft using this mechanism see copter.ardupilot.com/wiki/autotrim/

the params that are changed are here github.com/diydrones/ardupilot/ … Iris.param

Hope that helps :slight_smile:

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Thanks Bill… Smart idea on the level !!