TomH
Posts: 950
Joined: Thu May 27, 1999 4:13 am

Mig-25/31 Top Speed

Fri Jun 01, 2001 8:44 pm

Forum members are quick to point out that the MiG-25 and possibly the MiG-31 have the highest top speed of any operational fighter. Speeds close to Mach 3 are often claimed for these aircraft.

It is noteworthy that they are powered not by turbofans, but by Tumansky water-injected turbojets. To my knowledge, no recent Wesern fighters have tubojets or for that matter, water injection.

A couple of questions:

1. Is the powerplant technology on these aircraft the reason for their unmatched speed in an operational fighter? If so, why is it better than the more common turbofan? Did Tumansky develop a means to reduce or eliminate contrail generation, a feature likely to increase the aircraft's survivability?

2. The USA did not field the B-70 bomber in operational service. It was this aircraft that reportedly led to the development of the MiG-25. Why did Russia continue with operational deployment of an aircraft that possesses great top speed, but likely is lacking in the ability to engage in maneuvering air combat?

3. Regarding external weapons carriage by these aircraft. At very high speed, thermal limitations on the airframe must be respected, and the effects on weaponry must also be calculated. The performance of IR weapons in particular is likely to suffer in an elevated temperature invironment. Also, the increased drag on a missile at Mach 2.5+ would lessen the launch speed differential from the carrying platform unless a tremendously large booster were used. I pose these problems to question the ability of the MiG-25 to engage targets at its designed Mach limit. Any answers?

TomH
 
LY744
Posts: 5185
Joined: Sat Feb 03, 2001 11:55 pm

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 1:32 am

The MiG-25 is a great reconaicense (sp?) a/c, so that might be the reason they didn't cancel the program. The Foxbat could also be used to intercept conventional bombers like the B-52. Besides, the USSR liked setting world records.

I think the missiles on the MiG-25 are placed under the fuselage in a special semi-hidden compartment (it doesn't have any doors or anything, it keeps most of the missiles inside the fuselage).

LY744.

Pacifism only works if EVERYBODY practices it
 
flight152
Posts: 3221
Joined: Fri Nov 24, 2000 8:04 am

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 5:03 am

One of the reasons for the Mig-25 devolpment was the mach 3 A-12 which became the SR-71. The Mig-25 was too slow and could not touch it. All missiles were to be kept externally on [4] pylons under the wings.
 
flight152
Posts: 3221
Joined: Fri Nov 24, 2000 8:04 am

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 5:12 am

ooooh, also just wanted to say that the Mig-25 mach 3 performence was limited to minutes!
 
Fly-by-pilot
Posts: 180
Joined: Mon Sep 04, 2000 10:45 am

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 7:16 am

I am pretty sure the Harrier uses alcohol/water injection.
 
TomH
Posts: 950
Joined: Thu May 27, 1999 4:13 am

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 10:54 am

FlyBy,
I thought you were correct with the Harrier's Pegasus engine. But I checked my 1973 Jane's and they get into the Pegasus in detail. Still, I can't find mention of water injection in that tome. I'll look some more, as the Harrier sure would be a sensible candidate for water injection.
TomH
 
fireblade
Posts: 515
Joined: Sun Feb 05, 2006 10:13 am

RE: Mig-25/31 Top Speed

Sat Jun 02, 2001 6:56 pm

I'm not fan of these two aircraft but keep in mind
that mig-31 has the ZASLON the most powerfull radar
and the radars of four mig-31 work togather so they
could cover an area of 400sq km .With 4 mig 31 who need AWACS?
 
TomH
Posts: 950
Joined: Thu May 27, 1999 4:13 am

RE: Mig-25/31 Top Speed

Sun Jun 03, 2001 5:02 am

Fireblade,

Wow, that's really interesting. So the MiG-31 radars link-up in some manner to provide a wider area coverage? I assume this is data-linked to a ground station for analysis and force control.

Regarding AWACS. How much loiter time do you think a MiG-31 has?

TomH
 
Fly-by-pilot
Posts: 180
Joined: Mon Sep 04, 2000 10:45 am

RE: Mig-25/31 Top Speed

Sun Jun 03, 2001 5:56 am

Hmmm, linking 4 planes together, sounds familiar. Could there of been some technology exange between Iran and USSR. Anyways, the F22 will take this ability to the next level. Russian fighters are awsome machines but they dont stack up against any comparable US weapon system.
 
BarfBag
Posts: 2384
Joined: Fri Mar 30, 2001 7:13 am

RE: Mig-25/31 Top Speed

Sat Jun 09, 2001 2:16 am

The engines of the MiG-25 are redlined at just over Mach 2.8 I think. They overspeed if the pilot tries to go any faster than that. As far as the SR71 vs MiG25 thing goes, check out http://siafdu.tripod.com/foxbat.html .

The Syrians or Egyptians flew a Foxbat over Israel that was clocked at Mach 3.3 but both engines burned out by the time the pilot landed in Egypt.

India has also used Foxbats from its Trisonics squadron for recce missions over Pakistan. http://siafdu.tripod.com/recce1.html

 
TomH
Posts: 950
Joined: Thu May 27, 1999 4:13 am

RE: Mig-25/31 Top Speed

Sat Jun 09, 2001 9:31 am

Barf,

"As far as the SR71 vs MiG25 thing goes,"
If you are replying to my original post, be advised I never said a thing about the subject above. Perhaps you were looking at a different post?

TomH
 
BarfBag
Posts: 2384
Joined: Fri Mar 30, 2001 7:13 am

RE: Mig-25/31 Top Speed

Sat Jun 09, 2001 1:26 pm

TomH,
Yeah, I guess I must have been reading one post too many. I didnt really read youre post right before my response; I just remembered an article about the Foxbat I read recently & remembered this question so I made a general response. thanks
 
Guest

RE: Mig-25/31 Top Speed

Wed Jun 13, 2001 2:16 am

Mig-31 top speed is Mach 3.4
Mig-25 top speed is 3010 km/h.


Regards,


BBC_CCCP
RUS AF RULES!!!

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