Have you ever heard a higher altitude with the bis 75AP?

In Hungary, 1988. 05. 23, Lt. Col György Dózsa test pilot during an after-major overhaul test flight (the high altitude test) reached the 19500m level with the bort No.1889 plane.

The 75AP's official ceiling height is ~17000m.

Have you ever heard a hight altitude with this version than this? Do you have info about the serbian, croatian, polish, ex-soviet air forces experience?

(In the very first era, 1961-62, during the service entry test flights there were 23000m and Mach 2.35 with the MiG-21F-13 in the Hungarian airspace. But the F-13 and the PF were much lighter and cleaner version, than the bis).

2 days ago I tried a mission with 3 fuel tanks. I climbed to 14.500m. To save fuel I don't use afterburner below 8000m, that's the best result personally.

I guess I should take less fuel, maybe 1 center drop tank.

In Hungary, 1988. 05. 23, Lt. Col György Dózsa test pilot during an after-major overhaul test flight (the high altitude test) reached the 19500m level with the bort No.1889 plane.

The 75AP's official ceiling height is ~17000m.

 

Have you ever heard a hight altitude with this version than this? Do you have info about the serbian, croatian, polish, ex-soviet air forces experience?

 

(In the very first era, 1961-62, during the service entry test flights there were 23000m and Mach 2.35 with the MiG-21F-13 in the Hungarian airspace. But the F-13 and the PF were much lighter and cleaner version, than the bis).

Finnish testpilots made flights often over 20 000m (usually 18 000m) and Jyrki Laukkanen had own record to reach 21 300m altitude. And some info is about 2.05 Mach at 22 500m. This with Mig-21F-13.

That wouldn't work in DCS where the AoA is ridiculous at high altitudes.

I usually get a flameout somewhere after 21 500 meters...

And those altitudes aren't difficult to achieve, if you fly a profile by the book.

If you go that high, can you go over mach 1 without the afterburner?

Best way to try new altitude records is to climb to 10000 meters first. Once there, accelerate to Mach 1.8 or thereabouts then start climbing while maintaining that speed.

The result:

So there I was at 65616ft, or 20000m, as you prefer...

Intercept profile by the book: Accelerate after start to reach 950 km/h TAS by 1000 m. Maintain TAS until 10,000 m. Accelerate to 1200 km/h IAS and maintain until M1.9, which is then used for the rest of the climb.

The acceleration at 10,000 feels slow as molasses initially, but once past 1000 km/h the engine can breathe happily again and things start happening.

Reheat from the get-go.

Cheers,

/Fred

Just did a quick test, managed to climb up to 21 406m according to SARPP. I need to save more fuel though, had to land in someone's garden. That landing gear is surprisingly tough.

I usually get a flameout somewhere after 21 500 meters...

The same thing happened to me, I couldn't restart it until I got much lower.

Can you guys try testing altitude by flying to about 6 or 7km on mil power. Level off and accelerate until high mach then start the climb?

What I normally do is climb to about 8,000m, accelerate, climb to 12,000m, accelerate to m2.05, then pitch for a 45* climb. You can get it up to about 25,000m or so if I remember correctly. Don't worry about fuel, you don't burn anything really at those altitudes, and your engine will flame out anyway because of the altitude.

The F-4 that climbed to 95,000ft or whatever accelerated to max speed at 25,000ft, then pitched for 45* so that's what I based my trial on.

EDIT: Re-tried this method to see if I remembered correct or not. It goes pretty high. 88,662ft (27,024m)

This is for a fun, max zoom-climb though. I'm not sure the actual max cruising altitudes, but the best altitude for maximum speed is about 12,350m according to my experiences.

What I normally do is climb to about 8,000m, accelerate, climb to 12,000m, accelerate to m2.05, then pitch for a 45* climb. You can get it up to about 25,000m or so if I remember correctly. Don't worry about fuel, you don't burn anything really at those altitudes, and your engine will flame out anyway because of the altitude.

 

The F-4 that climbed to 95,000ft or whatever accelerated to max speed at 25,000ft, then pitched for 45* so that's what I based my trial on.

 

 

EDIT: Re-tried this method to see if I remembered correct or not. It goes pretty high. 88,662ft (27,024m)

 

 

 

This is for a fun, max zoom-climb though. I'm not sure the actual max cruising altitudes, but the best altitude for maximum speed is about 12,350m according to my experiences.

If you took a total of 6 A-A missiles with 1 large drop tank.

Carry the tank to 5km, then release it and only used mil power from there on out, how high can you get the 21?

If you took a total of 6 A-A missiles with 1 large drop tank.

 

Carry the tank to 5km, then release it and only used mil power from there on out, how high can you get the 21?

You could pretty easily carry the drop tank to 12,000m, I've done it before, it just takes forever.

I haven't tested your configuration, but I would assume the max zoom climb to be around 20,000m, max cruise around 14,000m, and max mach around 11,000m

I've been doing a couple of high climbs on the VA server in December. Not really zooming at the end, but the AoA gets really high at that altitude. Actually trying to deal with the AoA may have caused me to do a few inadvertent zooms...

I went with the bare 21, no external tanks. Afterburner continuously on from take-off, climb around 700 km/h until 8000 to 10000 m (before M0.9 would be best I think) then shallow dive to go supersonic (at least M1.2) and continue climb until it goes no further. It's pretty easy.

Screenshot shows me descending shortly after flame-out at 23430 m. More than half the fuel left for a leisurely flight home after restarting the engine below 10000 m.

My best is exactly 25000 m. That is with 4 missiles...

15000 m, Mach 2.05 - Zoom climb. I actually got higher as you can tell from the vs gauge...

http://udba.org/dcs/Screen_141115_003555.jpg

25300 is my personal best for now. :pilotfly:

Note that the engine flames out at some 22km, so the trick is having as much vertical speed as possible at that point.

On my first run, I got to 22,700m!

My altitude record in the 21 is somewhere around 90,000ft. Procedure: climb to 14km (clean configuration), accelerate to ~ Mach 2.1 (the lighter the better) switch on second reheat stage (emergency afterburner), point the nose upwards and soar towards the stars =)

That doesn't sound right. The second reheat stage doesn't (or rather, shouldn't) work above 4000m AGL. At least - that's how i remember it should be, and I'd never been able to activate it above said altitude.

Yeah, 2nd stage reheat doesn't even engage above 4km, and will shut itself off automagically if you climb past 4km with it on.

If you go that high, can you go over mach 1 without the afterburner?

I dont have the Mig (yet!) but that should not be possible (unless you are in a dive).

I haven’t tested this fully myself, but if you are going for altitude records in the sim, I know you can fire the RATO’s whilst airborne. I wonder if firing these just before the top of climb would give you an edge. It may well be that the drag of the RATO’s would be counteractive to the climb or the building of speed.

I dont have the Mig (yet!) but that should not be possible (unless you are in a dive).

Above about 55,000ft you're practically always above mach 1. I was stalled at 88,000ft still going over Mach 1. Air density is so low up there that you just don't slow down, and you need a massive TAS in order to keep control of the aircraft.