Rare stall behavior

[Albers]

Hi everyone,

 

I was practicing some aerobatics at low speed with the F-16C when I found a rare stall behavior in the flight envelope.

 

It is an induced situation in which the plane falls flat with zero speed in HUD while rolling from side to side. I have tried to recover the F-16C from this state playing with throttle (from IDLE to full AB), full pitch, raw, roll or even different fuel loads without success. The only way I have managed to regain control has been using the manual pitch override switch while keeping full stick ahead for some seconds. Otherwise everything ends with ejection and aircraft loss.

 

I experienced this phenomenon for the first time last December in version 2.5.5.41371 but it still occurs in version 2.5.5.41962.

 

I have attached a .trk file in which I reproduce the issue. You can use the option take control and try yourself. Probably a slight increase of pitch authority at slow speed could solve it.

 

Cheers

f16_flat_v2_5_5_41371.trk

[mvsgas]

Sound like normal and intended behavior. That is the sole purpose of the manual pitch override switch.

 

Some examples of the MPO being use after departure

video is set to 6:20, just hit play.

 

This is a direct PDF link to Semper viper, CODE One magazine. Page 10 has a good article about it. Keep in mind this is on old F-16, some of the details will not apply to the DCS F-16

https://www.codeonemagazine.com/images/C1_SemperViper_1_1271449318_9999.pdf

Edited January 24, 2020 by mvsgas
spelling

[BIGNEWY]

Hi Albers,

 

welcome to the forum,

 

thanks your track shows this unrecoverable stall very well in open beta.

 

We do have some flight model tweaks coming in a future patch, when I test the track in our internal build I can recover from the stall.

 

thank you

Edited January 24, 2020 by BIGNEWY

[Albers]

Hi,

 

Thank you for your quick and precise replies.

 

BIGNEWY, glad to know that you are tweaking the flight model in a future patch and you can recover the aircraft in your internal build. Congratulations on the DCS F-16C, I am really enjoying it.

 

msvgas, your video is very interesting as well as the documention regarding deep stalls and manual pitch override in F-16C. Excellent input.

 

Cheers

[BIGNEWY]

Hi,

 

Thank you for your quick and precise replies.

 

BIGNEWY, glad to know that you are tweaking the flight model in a future patch and you can recover the aircraft in your internal build. Congratulations on the DCS F-16C, I am really enjoying it.

 

msvgas, your video is very interesting as well as the documention regarding deep stalls and manual pitch override in F-16C. Excellent input.

 

Cheers

 

Thanks for the kind words, good to hear you are enjoying it.