cannot reproduce BALT hold oscillating

[SKIPPY 7-7]

When enabling BALT hold aircraft will pitch up and down violently and take some time to stabilize. Dee-doo-dee-doo sound also comes on.
This only happens once, subsequent engagements of BALT hold behave normally.  

[BIGNEWY]

please include a short track replay example, not seeing a problem here. 

Are you settled and trimmed before engaging? 

[Tusky]

I can confirm the behaviour described by the OP. Even if you settle the plane on a levelled flight (VV on the horizon), once you select BALT the plane will pitch up/down violently before dampening out the oscillations and levelling out at the engaged altitude. It is always a gamble...

I'll try to reproduce and attach a track but from my experience, it happens after you've flown for a while (at least that's when I engage A/P).

[BIGNEWY]

please include a track replay example, ensure you are not to slow once in the hold mode

[MarkyMark]

I thought this was my joystick dead zone settings but you’re right, I’ve had the violent swings for no reason as well. 

[Tusky]

Usually this happens well into a mission after several maneuvers have been performed before the A/P is engaged; a tacview file might be more appropriate than a track file.

It still happens and I'll try reproducing it.

Edited January 24, 2023 by Tusky

[rob10]

7 hours ago, Tusky said:

Usually this happens well into a mission after several maneuvers have been performed before the A/P is engaged; a tacview file might be more appropriate than a track file.

It still happens and I'll try reproducing it.

Tacview might be easier for you to provide (I get it, a track file longer in is likely to be corrupted), but as I understand it the devs need a track file to run through their debug software so a Tacview is likely of minimal use to ED.

[Tusky]

hace 9 horas, rob10 dijo:

...but as I understand it the devs need a track file to run through their debug software so a Tacview is likely of minimal use to ED.

Then it's never going to happen. Trackfiles get corrupted after a few minutes of maneouvering...

Hopefully, a member of the dev team will encounter it when flying with the sim. There's not only player's feedback... 

[BIGNEWY]

I use track replays everyday for bug reporting and reproducing. While some tracks can get corrupted many do not. So please if you have a track replay please attach it. 

thanks

[VKing]

Not quite sure if it's the same issue since I haven't seen the oscillations, but altitude hold does indeed not work. Pushing either BALT or RALT hold does not bar the OSBs and gives a master caution.

This seems like it was a controller problem, and should not affect the original issue.

Edited February 14, 2023 by VKing

[Razor18]

Guys, isn't it just the fact, that before pressing BALT, you do not level out the aircraft, and the aircraft just wants to go back to the exact altitude, where you pressed the button while still climbing or descending?... Just a thought...

Edited January 28, 2023 by Razor18

[Tusky]

hace 12 horas, Razor18 dijo:

Guys, isn't it just the fact, that before pressing BALT, you do not level out the aircraft, and the aircraft just wants to go back to the exact altitude, where you pressed the button while still climbing or descending?... Just a thought...

 

I speak for myself and the answer is no: I usually try to level out the aircraft before engaging the A/P. Neverthess, the A/P produces a pronounced and sudden oscillation of a few degrees in the pitch axis.

I'll try reproducing it and load up a track.

Edited January 29, 2023 by Tusky

[Tusky]

Here's a 4:30 minute track:

2xAIM-9X + central tank

- Level flight
- 360° sustained level left turn
- 360° sustained level right turn
- Left break
- Right break
- High alpha left nose up 
- High alpha right nose down
- Level flight, zeroing vertical velocity and maintaining 350kn

As I engage AP (about 4:19) the nose abruptly pitches down (-1100 fpm) and then up again as it oscillates back to level flight.

Is this normal? Am I doing anything wrong?

Test AP.trk

Edited January 30, 2023 by Tusky

[BIGNEWY]

Looks normal to me. 

you level out at the altitude you engaged the AP hold at. 

[Tusky]

hace 2 horas, BIGNEWY dijo:

Looks normal to me. 

you level out at the altitude you engaged the AP hold at. 

True but the point is not the end altitude but the abrupt pitch down movement (down to a vertical velocity of about -1100 ft/min and -3°; don't remember the G) AS I ENGAGE the AP. I do see it if I replay the attached track and I do experience it often in flight (and sometimes it is "seamless").

Is this attitude "jerk" (for lack of better term) a working-as-intended behaviour or a "jerkless" (for lack of a better term) transition to AP should be expected?

Edited February 13, 2023 by Tusky

[BIGNEWY]

I can run it by the team, but if you have any other public evidence it is incorrect please DM me 

thanks

[VKing]

My addendum earlier in the thread appears to have been caused by some slack in my joystick (the precision of the centering required before alt hold activates might be a seperate issue), and should be ignored for this bug.