Plane 3.9.1beta release

ArduPlane Plane 3.9
41

Here is my log for exactly the flutter issue on small wings. http://www.filedropper.com/2018-09-0916-56-45

I was running a sky shadow S800 wing with default 3.9.1 PIDs. Severe flutter in minimal wind.

I will be reverting to the 3.9.0 defaults and will let you know if I have any success (next weekend)

RLL2SRV_P 0.6
RLL2SRV_I 0.1
RLL2SRV_D 0.02
PTCH2SRV_P 0.6
PTCH2SRV_I 0.1
PTCH2SRV_D 0.02
TECS_PITCH_MAX 0
NAVL1_PERIOD 20

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42

Hi @tridge may be the log in the previous post will shed more light on the default PIDs. This is the 3rd instance of someone experiencing the flutter on maiden. So far all 3 where using small flying wings S800 and Wing Wing Z-84

Thank you!

43

I snuck out and had a quick flight with 3.9.0 default PID values on my S800 and it flew well.

44

thanks, that is very helpful! It clearly shows that it is the D term that is the problem.

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I will halve the default pitch D for the 3.9.2 release. Can you try with defaults for 3.9.1, but with half the PTCH2SRV_D term? The default is 0.08, so try with 0.04.
Cheers, Tridge

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45

Brilliant - thanks for the explanation. I will try out the new values over the weekend.

46

Much improved performance, thanks again. Log is here if you would like to take a look http://www.filedropper.com/2018-09-1517-27-39

1 Like