[PeterD]

Unless they are supposed to act like this, I think there is a problem with the MiG-15 auto-airbrake.

I was testing a high altitude (8000m) intercept mission
on the Korea map and the airbrakes were randomly deploying at speeds as slow as 655kph. I was just cruising along when all of a sudden they deployed.

Even when I tested the mission on autopilot, the AI would deploy the airbrakes at these lower speeds.

Below is a very small test mission so you can see it for yourself. When the mission starts, just hit your autopilot command. When the plane reaches 655kph, the airbrakes will deploy.


[MAIN]
MAP 3BG_KTO/load.ini
TIME 12.0
CloudType 0
CloudHeight 1000.0
player IJA_F_S_105z00
army 2
playerNum 0
[Wing]
IJA_F_S_105z00
[IJA_F_S_105z00]
Planes 1
Skill 2
Class air.Mig_15bis
Fuel 75
weapons default
[IJA_F_S_105z00_Way]
NORMFLY 197654.29 473792.57 8000.00 800.00 &0
NORMFLY 300169.01 354314.98 8000.00 800.00 &0
[NStationary]
[Buildings]
[Bridge]
[House]

Now, I can put the F-86 at the same altitude (8000m) and it will run at 810kph and not break up. So, I think that alone should tell you that the auto-airbrake implementation is incorrect. I hope you can follow what I am trying to say in this example, as I am not an aeronautical expert. However, I believe this is the correct assumption.

My guess is that using the mach number as the trigger for the auto-airbrake is not the way to go.

Below is the same test mission, but now with the F-86 as the Player plane. When the mission starts, just hit your autopilot command. You will see that the F-86 will reach a max speed of 810kph at that altitude (8000m). Compare this to the max speed of the MiG-15 before the auto airbrake deploys (655kph). Obviously there is something wrong.


[MAIN]
MAP 3BG_KTO/load.ini
TIME 12.0
CloudType 0
CloudHeight 1000.0
player 8AF_361FG_376FS00
army 1
playerNum 0
[Wing]
IJA_F_S_105z00
8AF_361FG_376FS00
[IJA_F_S_105z00]
Planes 1
Skill 2
Class air.Mig_15bis
Fuel 75
weapons default
[IJA_F_S_105z00_Way]
NORMFLY 197654.29 473792.57 8000.00 800.00 &0
NORMFLY 300169.01 354314.98 8000.00 800.00 &0
[8AF_361FG_376FS00]
Planes 1
Skill 2
Class air.F_86A5
Fuel 75
weapons default
[8AF_361FG_376FS00_Way]
NORMFLY 214248.40 490017.93 8000.00 975.00 &0
NORMFLY 439928.29 257331.63 8000.00 975.00 &0
[NStationary]
[Buildings]
[Bridge]
[House]


Aviar

The MiG calculates when to pop the airbrakes as follows:

Reads the vectorFlow from the FM, whatever that is
calculates the square root of the length of vflow, let's call this "A"
and finally,

mach_number = (A / current_atmospheric_sonic_speed_at_current_altitude)
if mach_number > 0.91, pop the airbrakes.

Have you tried ANY other map? in my tests in Crimea it worked allright