alot of engine flameout and 80% unable to relight

[Bremspropeller]

1 hour ago, Super727 said:

Hi,

I found that when flying supersonic, do NOT reduce the throttle when above Mach 1.4.  To reduce speed, deploy the airbrakes and leave the throttles at full afterburner until slowing to less than Mach 1.4.   Once you are below Mach 1.4 you can SLOWLY reduce the throttles to further decelerate.  

Also try not to fly above 50.000 feet.  The engine may stall when above this altitude.

Have you tried going Buster (full dry)? The engine's RPM shouldn't change when *just* coming out of burner and that should include Survitesse (~500RPM increase that happens at that speed).

[gulredrel]

6 hours ago, Bremspropeller said:

Have you tried going Buster (full dry)? The engine's RPM shouldn't change when *just* coming out of burner and that should include Survitesse (~500RPM increase that happens at that speed).

I also had no problem doing this. Going out of AB detent but leaving throttle at MIL is okay to decelerate below M1.4, so the RPM in MIL than lowers to 8400 rpm automatically and from there on, you can reduce further.

[Riesling]

Hello,

Thanks for the advice.

I guess the intake cones are automatically open while in supersonic flight. If you fully reduce the throttle, it will disturb the turbofan fuel/air ratio, and stall the engine. 

Key word of MF1 is : smooth  

The official ceiling altitude of MF1 is 52000 feet with a max ceiling altitude at 60700 feet (18500m) [1] . But those performance charts are given to an empy wings confifuration (configuration lisse) . By the way, the engine should not stall at 50k feet in normal flight operation. 

[1] Source: https://www.dassault-aviation.com/en/passion/aircraft/military-dassault-aircraft/mirage-f1/

 

Edited August 21, 2022 by Riesling

[Mumby]

On 8/12/2022 at 8:12 AM, MarkP said:

guys just to confirm, its idle, not cutoff, am i right?

 

Problem is the required airspeed. According to the document its 500kts below 10k which is effectively close to Mach 1. I cant believe that this it correct, way too fast, is it?!

I thought it was cut off (use the cutoff switch) not idle.