Mirage disintegrated while pursuing maximum level speed at 45,000' altitude - ED Forums
 


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Old 09-17-2018, 01:02 AM   #1
Pzkfw
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Default Mirage disintegrated while pursuing maximum level speed at 45,000' altitude

I just attempted to max the speed in the Mirage at 45k alt. The aircraft reached mach 2.3 and continued to slowly accelerate... eventually, the left wing ripped off. No aerobatics were done, this was in level flight. My understanding is that the Mirage's maximum speed is mach 2.2.

Is this a feature or a bug?
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Old 09-17-2018, 03:26 AM   #2
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Quote:
Originally Posted by Pzkfw View Post
I just attempted to max the speed in the Mirage at 45k alt. The aircraft reached mach 2.3 and continued to slowly accelerate... eventually, the left wing ripped off. No aerobatics were done, this was in level flight. My understanding is that the Mirage's maximum speed is mach 2.2.

Is this a feature or a bug?
The maximum allowed speed is officially 750kt CAS (safety margin).
It is known to have tested without issue up to 800kt.

In ISA conditions your M2.3 at 45 000ft would be 843kt.

I think we can call that a feature

But climb 10 000ft more and you will be only doing 702kt. Should be OK.
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Old 09-17-2018, 09:03 AM   #3
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Old 09-17-2018, 10:17 AM   #4
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I read that in the Mirage IV, the airframe would start to cook passing the max allowed airspeed (Mach 2.2 like the Mirage 2000). The pilot would experience a burning smell and even see smoke in the cockpit at Mach 2.5. It's very likely that the same thing would happen in the Mirage 2000, instead of its wings ripping out. But hey that's just my educated guess.
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Old 09-17-2018, 10:24 PM   #5
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Originally Posted by Axelerator View Post
I read that in the Mirage IV, the airframe would start to cook passing the max allowed airspeed (Mach 2.2 like the Mirage 2000). The pilot would experience a burning smell and even see smoke in the cockpit at Mach 2.5. It's very likely that the same thing would happen in the Mirage 2000, instead of its wings ripping out. But hey that's just my educated guess.
You’re probably right. But how would you simulate the burning smell in DCS ?
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Old 10-08-2018, 04:46 PM   #6
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But did your parachute work?
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Old 10-08-2018, 05:15 PM   #7
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Quote:
Originally Posted by jojo View Post
The maximum allowed speed is officially 750kt CAS (safety margin).
It is known to have tested without issue up to 800kt.

In ISA conditions your M2.3 at 45 000ft would be 843kt.

I think we can call that a feature

But climb 10 000ft more and you will be only doing 702kt. Should be OK.
Forgive my ignorance but why are aircraft structural limits in terms of calibrated airspeed? Wouldn't indicated airspeed make more sense since that's a more direct measure of how much air is hitting the airframe in a given time, and so a better measure of the stress on the airframe?
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Old 10-09-2018, 07:58 AM   #8
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In fact, the real limit for a supersonic aircraft is temperature.
These speeds are just guidelines for the pilot, and the Mirage HUD display CAS.

Have you looked for the definition of Calibrated Air Speed ?
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Old 10-09-2018, 08:06 AM   #9
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Quote:
Originally Posted by The Integrator View Post
Forgive my ignorance but why are aircraft structural limits in terms of calibrated airspeed? Wouldn't indicated airspeed make more sense...
Calibrated airspeed is the same as Indicated airspeed but corrected for position error (it’s “true indicated airspeed” if you will). You’re right that that is the number you should be looking for with regards to structural limits...
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Old 10-09-2018, 08:47 AM   #10
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I suppose you could simulate the burning smell by having a peripheral that sets fire to your gaming seat when certain parameters are met?

It'd be far more realistic, so why not?
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