[BUG] Weird high AoA departure mode

Hi all,

I really enjoy your last update especially on FM change. However, if you guys have time it would be nice if you can investigate this type of departure.

The procedure is as follow

- slowly decel in level-ish flight until a stick is at full aft. (Slight afterburner is needed to maintain a level flight)

- with stick aft, aileron neutral wing rock is not significant.

- Apply full burner, and adjust pitch to maintain 30-40 deg pitch.

- The aircraft will wing-rock, nose slice and then depart while maintaining a positive climb profile.

- Roll SAS on/off does no influence.

ADMIN EDIT: The BUG part seems related to the roll out of stall departure without yaw or roll input (see video below) - the rest seems ok. [ironMike]

Here is the tacview :

Tacview-20190707-041006-DCS.trk

Hi all,

 

I really enjoy your last update especially on FM change. However, if you guys have time it would be nice if you can investigate this type of departure.

 

The procedure is as follow

- slowly decel in level-ish flight until a stick is at full aft. (Slight afterburner is needed to maintain a level flight)

- with stick aft, aileron neutral wing rock is not significant.

- Apply full burner, and adjust pitch to maintain 30-40 deg pitch.

- The aircraft will wing-rock, nose slice and then depart while maintaining a positive climb profile.

- Roll SAS on/off does no influence.

 

Here is the tacview :

Hi, the video is not available, could you re-upload it please? Thank you.

My apology. I forgot to set it to the public type. This should be fine now.

Without knowing the actual weight and loadout it's difficult to judge where the problem is. This departure doesn't seem impossible for e.g. a low weight config.

My apology. I forgot to set it to the public type. This should be fine now.

 

Ok, this looks like a classic stall, but really hard to say anything about the reasons and how it was induced, as that is not shown and also the telemetry data is missing (so it is hard to make assumptions about speed etc).

Was this a one off, or does this occur every time? If the latter, could you show us a simple video of you taking off, please and prior to that, show loadout and zoom in on your trim setting.

This looks like an abnormallly high trim setting prior take off, just from the hip.

This looks like an abnormallly high trim setting prior take off, just from the hip.

Is there a difference in max horizontal stabilizer deflection angle between e.g. full nose up and nose down trim on the F-14?

Ok, this looks like a classic stall, but really hard to say anything about the reasons and how it was induced, as that is not shown and also the telemetry data is missing (so it is hard to make assumptions about speed etc).

 

Was this a one off, or does this occur every time? If the latter, could you show us a simple video of you taking off, please and prior to that, show loadout and zoom in on your trim setting.

 

This looks like an abnormallly high trim setting prior take off, just from the hip.

Departure occur quite consistent at least for the following config

: Clean with no pylon

: Full internal fuel

: Speedbrake extend or retracted

: Maneuver flap slat auto

: Wing sweep auto.

: Spawn mid air

Most of the time I spawn mid-air when this behavior is observed. I will try hot spawn and see if they have any influence.

PS. Does HB still export the flight telemetry data like the previous build? ie F14FMLog.csv

Here is the video I recorded in flight.

While I don't notice an abnormal climb, this does indeed look strange.

The F-14 is more or less stable at 35° AoA but departs as soon as the AoA is considerable decreased.

Departure occur quite consistent at least for the following config

: Clean with no pylon

: Full internal fuel

: Speedbrake extend or retracted

: Maneuver flap slat auto

: Wing sweep auto.

: Spawn mid air

 

Most of the time I spawn mid-air when this behavior is observed. I will try hot spawn and see if they have any influence.

 

PS. Does HB still export the flight telemetry data like the previous build? ie F14FMLog.csv

 

Here is the video I recorded in flight.

There is nothing really abnormal I see from the video? You are basically keeping it at the edge of a stall. What would be interesting to see is how you got there. Additionally it would be good to see your flaps and maneuver flaps settings or indicator. the maneuver flaps at this point will aid the stall, you might need to retract them manually to gain enough speed to get her stable again. (also unless you let go of the stick, this behaviour will continue of course. you keep pulling it aft) Lastly, if this happens on spawn, maybe the spawn speed is too slow?

Ok my apologies, we all rewatched your video and thought of the induced roll out of the stall being suspicious. The rest seems fine. We will investigate this further. Thank you again for reporting it and putting together all this valuable material, it is much appreciated!

Glad to see you guys spot the issue. Looking forward to the future update.