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Clarified: Huey sits on the ground at wrong pitch angle with AFM
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Description

Continuing on from previous report - More details about the issue:

UH1 sits on the ground at a different angle when using AFM, compared to Standard flight model:

Notice pitch angles.

On the top picture, with AFM enabled, you can see the UH1 keeps a nose-flat-on-horizon attitude when landed. This is incorrect and you may also note that the front of the skids are partially clipping under the ground.

On The bottom picture, with AFM disabled, the UH1 lands with the correct 5º-ish nose up attitude. The skids are not clipping, as they are perfectly aligned with the ground surface.

You can observe also, by toggling AFM on and off, that the aircraft will teeter-totter back and forth between these two different positions. These changes are immediate when going from AFM to Standard mode, and take about 1~2 seconds to revert when switching from Standard to AFM

Details

Severity
None
Resolution
Open
Reproducibility
Always
Operating System
Windows 10 x64
Category
Advanced Flight Model
Steps To Reproduce
  • Board UH1 as pilot (any variant)
  • Stay on the ground, engine on/off is optional
  • Go in game settings, and select Advanced Flight Model (or default, whichever isn't selected)
  • Observe how the aircraft shifts to a slightly different position
  • Go back in game settings, repeat the process, reversing your flight model selection.
  • Observe again, the aircraft shifts back to its original stance.
  • Repeat as needed.
Additional Information

Landed pitch angle difference between Advanced and Standard FMs is just under 5º
Zoom in on ADI for better comparison of landed positions between either mode. (picture provided)

On a related note, the UH1 is slightly unstable when landed with AFM on.
It is possible for another player to "nose bump" a landed Huey (while pilot is inside with AFM enabled) such that the aircraft jerks backwards as if receiving an uppercut punch to the chin.

In some occasions, this action may cause destruction of the helicopter.
It explodes violently if the bump is large enough that the tail contacts the ground, killing/incapacitating all aboard and nearby.

Event Timeline

Moach created this task.Jan 12 2023, 1:19 AM
Moach changed Category from General to Advanced Flight Model.
Moach updated the task description. (Show Details)Jan 12 2023, 1:56 AM
Bob_Murphy added a subscriber: Bob_Murphy.

Hey Moach,

thank you for the clarification.
Can you confirm that you have those AFM settings?


Also, do you have any mods enabled and if so, can it be recreated without the mods active?

Thank you.

Best Regards,
Bob Murphy

Also, could you please test it at Pleiku Airbase and let me know where you test?
This where I test and I don't have any issue.
So that issue might not be related to the UH but to the ground you are testing on.

Thank you.

Best Regards,
Bob Murphy

Moach added a comment.Jan 25 2023, 5:26 PM

The initial test I did of this was at Pleiku, at the standard Green Hornets pads on Mike Force (BRO Nation #1 server). The issue is present regardless of landing location.
The pictures posted above were taken at Khe Sahn airbase (A Vietnam Story server)

The only permanently enabled mod I keep is Enhanced Movement , other mods I use only on occasion.´ I will repeat the test with it off and report back

I will also run the test offline and see if this somehow related to multiplayer (weird, but it's ArmA, so who knows?)

Moach added a comment.EditedJan 25 2023, 5:38 PM

Test completed, No mods, Single Player, Scenario Editor Huey set at Pleiku.

Observe: (please allow time for attached .gif to load, ~50MB)

I have also tested various AFM sub-options on and off. There was no difference in behavior on any configuration. Landed pitch is 5º nose-too-low whenever AFM is enabled, regardless of the more specific parameters.

We may now rule out the issue being MP/SP or mod dependent.
Version number is 2.10.149954 (auto-updated through Steam)

Hey Moach,

I finally was able to reproduce it.
It does not seem to be an issue on all UH models but the I was able to reproduce it on the vn_b_air_uh1d_02_07 which seems to be exactly the one you used.
I'll pass on the ticket to our internal specialists.

Best Regards,
Bob Murphy