Trim and autopilot

[rferraz]

Hello–

I got a weird problem with trim and autopilot. I followed the instructions on the video to set real trim for X-Plane–they work great. However, whenever I engage the autopilot, the trim value for X-Plane goes to either -1 or 1 , which causes full deflection of the elevator. The result is that when I leave autopilot. if I forget to reset the trim value, the plane immediatelly stalls or dives, usually resulting in a crash. Any clues about this?

I’m using CLS2Sim 4.9.1 with firmware 352 and hardware GER 1104. X-Plane is 11.20. I’ve tested with default planes and a clean profile and the problem persists.

Thanks,

[ady7970]

Hi – did you ever manage to resolve this? I have similar autopilot issues in X-Plane 11 but others do not…

[sbrunner]

Hi

Can you tell us which plane you are using?
Have you downloaded a profile from the “Profile Cloud”?
http://cloud.brunner-innovation.swiss/

So we can check…

Regards

Stefan Brunner

[ady7970]

Hi Stefan,

For me, it is your C172 profile with the X-Plane 11 C172. Autopilot doesn’t work, the aircraft will be flying straight but the yoke will be hard over to one direction. Here’s a photo so you can see – the aircraft yoke is centred and yet the Brunner yoke is over to the left and trim is -1 as per this post. Disengaging the autopilot results in the aircraft doing a nose-dive.

Regards,

Ady

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[Diego Bürgin]

Hello Ady

If you use the Standard Cessna 172 SP profile from Stefan Brunner and you have changed your plane according to the realistic trim video,
you need to remove the flag from the check-boxes “Don’t set pos in AP mode” in the Autopilot tab.

Can you tell me if you have this flag set in your own profile?

The plane should fly normally now, except that the autopilot tends to oscillate for a moment when changing attitude, for example when capturing height.

Best regards
Diego

[ady7970]

Thanks Diego – I’m just about to completely reinstall my OS and simulators. I’ll try all of this once it’s installed and will report back.

[Author]

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