Aircraft Starts Flipping/Spinning Midair

[Regis9]

Hello, my last two attempted flights have ended the same way, with the aircraft suddenly becoming uncontrollable and flipping/spinning in place (ie not any kind of real world stall/spin behaviour). Both times i was climbing out of KRNO. I have saved .flt files for both instances, I'm not sure what other information I can provide. In both cases the aircraft was climbing steadily under the control of the autopilot and out of nowhere this happened.

Thanks

[KenG]

Devs may be able to respond better, but my experience is the airplane does not react well to being loaded midflight.

[Regis9]

Thanks, i wasn’t loading a flight, I just meant that I saved the .flt files after the issue occurred in case it was helpful in the investigation. I started the flight from the ground.

[wells]

I have seen some oddities the first time a new aircraft is loaded. Usually, problems with controls or lighting. I have not seen this problem, but maybe try shutting down P3D and restarting it with a different default aircraft. Then, select the KA and go from there.

[Regis9]

I tried a reinstall and have been able to climb to FL260 without the issue so hopefully whatever gremlin I was encountering has been dealt with, will report back if it recurs.

[freeze1058]

Hi,

after many successful flights I ran into subjected issue climbing through approx. FL100. The aircraft suddenly increased climb to +8000 FPM, then went into a kind of spinning (more extreme than a classic stall). Couldn't get into back to control until crashing ground.

Did more please experience issues in the mean time?

My only vague idea is a sudden unrealistic change of winds from ActiveSky or other weather engines that the aircraft cannot handle.

Cheers,

Stefan

[Raptor]

What was the aircraft loadout?

[freeze1058]

Hi,

I was just able to reproduce the issue with same route and historic weather from ActiveSky.

Flightplan: ENVA OSMU1B OSMUM Z286 KEKOD EVNAN EVNA1M ENSG

METAR: ENVA 232020Z 29022KT 7000 -RA SCT016 BKN025 03/01 Q1004 TEMPO 27022G35KT SHRA BKN014CB RMK WIND 670FT 30022G33KT

The OSMU1B Rwy 27 SID features tight turns:

sid.jpg (54.19 KiB) Viewed 2254 times

At FL120 the wind was already at gusty 64 kts. In combination with the steep heading change, the airspeed appeared very volatile. The FLC mode started chasing by extreme vertical speed adjustments, first up to +8000 fpm then into steep descend:

p3d.jpg (48.07 KiB) Viewed 2254 times

I was only able to stabilize the aircraft by disengaging autopilot and manually adjusting pitch.

After the stabilizing and turning on autopilot & FLC mode again I ran into same situation upon next turn at VA802. During turn the aircraft did not adjust the vertical speed at all. Once back in level flight, it rapidly increased climb and so on...

This is the aircraft loading I used for all my previous flights without issues:

mvams.jpg (82.34 KiB) Viewed 2252 times

In the end it appeared the turns in combination with strong winds was just "too much" for the aircraft to maintain track and climb.



Question is how a real King Air would react?

Regards,

Stefan

[meese91]

I've had this happen once as well on climbout, in the FL100-FL150 region. No data to bring to the table, really, other than I think that was the last time I ever used the FLC mode. Not because I particularly suspected it of being the culprit, but because the porpoising it produces had annoyed me just before the event and led me to find out about climbing at 6-7° pitch. The event itself was the aircraft rotating at a high rate around it's lateral axis, possibly with some roll/yaw as well. The GS went to about zero and the vertical rates flew between several thousands up and down, however the net altitude loss was at something like 300-500fpm.

I once had a similar event in the FSLabs 320, at least two years ago now I'd say, and in both cases it feels like whatever part of the aircraft's software is running outside the sim partially or fully stops talking with the sim? I'm not too worried about it, but it's interesting to see several experiences on it already.

[B747F]

More than once this happened I had been once in vertical speed descent the other flight change holding ias.

[chevelle505]

Just finally happened to me yesterday. Ive gotta say, its a nice flying airplane overall but the dynamics feel more like a j3 cub in rough weather. It doesnt handle wind well at all.

[freeze1058]

Hi development team,

I just completed a flight with moderate cloud turbulence in climb. Speed jumped approx. +/-5 knots. Autopilot was in FLC change mode to hold 160 knots. Upon entering the turbulence the aircraft started heavy vertical adjustments between +3000 fpm and +0 fpm trying to chase the selected speed.

I wouldn't want to be a passenger on this flight because the adjustments appeared heavy and sudden.

Have any update to the flight model or FD/autopilot logic been made up to version 1.1.28?

Cheers,

Stefan

PS. Again, this is based on a "feeling of unstability". I did not yet do the flight mentioned above again where the aircraft completely became uncontrollable and crashed.

[doodlebug]

which version please?

[Taguilo]

Guys,

Do not use FLC with strong turbulence, when IAS variations are pronounced. Change to VS and let the aircraft ride the bumps.
Beware effect is most notable with low frame rates (below 18 fps) and also if using ActiveSky, sometime it injects too much up/down drafts; if that's the case then lower turbulence effect slider if planning to fly with bad weather.

Tomas

[wells]

I have not been able to reproduce this spinning out of control. If this happens, try hitting the slew key twice ( Y key by default ). That should stop the spinning and then you can recover the attitude manually.