Problems re-lighting engine in mid flight

[MonsterZero]

Hey occasionally I have flameouts when performing radical maneuvers. After that generally I have to eject because I can't re-light the engine.

 

Can somebody teach me the correct procedure for air re-start?

 

Edited February 4, 2016 by MonsterZero

[Nerd1000]

Its pretty simple. Put the aircraft into a dive such that the airspeed indicator is >500 km/h and your mach number is less that 0.8. Set the throttle to idle. now throw the 'in-air restart' switch on the left hand side of the cockpit, aft of and above the gear lever. You should hear a whistling sound and see the engine RPM gauges start to increase. Once you reach idle RPM, advance the throttle a bit and turn off the in air restart switch.

 

Then you can throttle up and pull out of the dive.

[Drag0nWIng]

And remember attention your attitude.

[MonsterZero]

Its pretty simple. Put the aircraft into a dive such that the airspeed indicator is >500 km/h and your mach number is less that 0.8. Set the throttle to idle. now throw the 'in-air restart' switch on the left hand side of the cockpit, aft of and above the gear lever. You should hear a whistling sound and see the engine RPM gauges start to increase. Once you reach idle RPM, advance the throttle a bit and turn off the in air restart switch.

 

Then you can throttle up and pull out of the dive.

 

Ha! I didn't know I have to dive the plane but that makes sense since the turbine will turn freely due to air flow, promoting re-light. Thank you so much.

[Nooch]

You don't need to dive. Actually what matters is the airspeed. Here is a quote from the manual

 

"Engine relight is ensured :at altitudes of 8000 to 10.000m, from air speed of 550km/h up to Mach numbers of 0.9M ; at altitudes below 8000m, from air speed of 450km/h up to Mach numbers of 0.9M."

[Nerd1000]

You don't need to dive. Actually what matters is the airspeed. Here is a quote from the manual

 

"Engine relight is ensured :at altitudes of 8000 to 10.000m, from air speed of 550km/h up to Mach numbers of 0.9M ; at altitudes below 8000m, from air speed of 450km/h up to Mach numbers of 0.9M."

 

Indeed, however without the engine the MiG will lose speed fast if you don't put it into a dive. The important thing is keeping the plane in the target speed range for re-light.

 

Edit:

 

Ha! I didn't know I have to dive the plane but that makes sense since the turbine will turn freely due to air flow, promoting re-light. Thank you so much.

 

The reason for the speed range is that then engine needs to spin freely from the airflow in order to re-light, as the MiG-21's starter motor is useless once you're in the air.

 

There is one other thing you should be careful of: The mid-air relight system uses a bottle of compressed oxygen that is sufficient for 2-4 re-start attempts, depending on how long you leave the switch in the on position. Once that oxygen supply is depleted you won't be able to re-start the engine, so try to conserve it.

Edited February 5, 2016 by Nerd1000

[Kрлe]

Why cant mig use its starter in flight. My friend activated in-air restart switch and than starter switch and mig restarted. Maybe speed was more than 500, dont know.

[ekg]

Why cant mig use its starter in flight. My friend activated in-air restart switch and than starter switch and mig restarted. Maybe speed was more than 500, dont know.

 

I have done this too. Don't remember the speed though. Probably at least 400