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Subject: Dogfight tricks ...
Bluewings12    4/22/2009 6:07:56 PM
A M2000-5 Pilot here in Dijon ~a friend of mine~ told me that He and his aircraft can leave any other following aircraft in the dust with one pass . When I asked "any aircraft ?" , he said yes and he directed me to that video : h*tp://www.dailymotion.com/video/x3424v_french-air-force-mirage-20005_shortfilms He said to me , check from 1:12 to 1:28 . He explained to me that the Mirage is diving instantly nose first with a negative 4Gs plunge , followed by a 6g plate then followed by an 11g 180deg turn , the end speed is close to 300 knots . He said to me , "imagine where the bugger who is following you ends up ? NOWHERE !" To start with , 99% of the Pilots will not plunge nose first but will make a roll to dive "against the Gs" . There are 3 reasons to do so : #1 to avoid the "red-out" , # the FBW is not at ease , #3 you need a delta wing . When I asked him how he could turn the situation to his advantage , his answer was simple : "keep turning high Gs left or right , depends where he went and you 'll end up behind him , if he goes vertical go vertical too , he will ALSO be in front of you" Please , post some other nice videos of good dogfight tricks :-) Cheers .
 
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warpig       4/26/2009 6:49:51 PM
I flat out do not believe M2000-5 pilots are taught to pull 11Gs ever.  Some aircraft can not provide more Gs than their electronic flight control system will allow, e.g., the F-16 is limited to 9Gs by the FCS, regardless of how big an input is demanded by the pilot on the stick.  Many aircraft flat out are not designed to be able to ever provide that many Gs to begin with (the MiG-25/31 family flat out can never pull more than abut 5Gs, period),  Some jets can give you that many Gs if the pilot commands it, e.g., the F-15 will try to give you a certain amount of G per inch of stick movement, I think it's something like 1G for every one-half inch, and so the more you pull the more you are commanding the aircraft to do, and if you're in the right part of your flight envelope you can develop beyond 9Gs.  Few fighters at all are actually capable of delivering as many as 9G, and even then it is usually only where you are at your highest q (dynamic pressure), like around M0.95 and down on the deck.  Many aircraft considered quite manueverable, like the F-18 and the Su-27, for example, are not 9G-capable aircraft.  I admit I do not know the specifics of the M2000 FCS, and so maybe it is physically possible to actually command more than 7.5, 8, 8.5, maybe even 9G, but frankly I doubt it.  However, even if it is physically possible, I think it's extremely likely that it is placarded at no more than 9G for flight safety reasons, and intentionally over-G'ing the airframe in peacetime, even during air combat manuevering training, is undoubtedly a career-threatening move (and at a minimum sure to draw some disciplinary action).  The F-15 has a maximum G indicator in the tail section by the stabilator actuators that registers the peak G put on the airframe.  I have heard that an Israeli pilot once put 12Gs (peak, and undoubtedly only for a very brief time) on his jet while avoiding a Syrian SAM.  The aircraft held together and the pilot made it back to base, but he bent the airplane and it was out of service and had to be repaired.  It might be possible to pull 11Gs under a specific set of conditions, but I do not believe that 11G manuevers are practiced nor considered acceptable in anything other than an actual combat situation.
 
 
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warpig       4/26/2009 6:53:07 PM
And of course, all that is assuming the pilot manages to stay conscious and not just end up as a lawn dart.
 
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gf0012-aust       4/26/2009 6:57:22 PM

I flat out do not believe M2000-5 pilots are taught to pull 11Gs ever.  Some aircraft can not provide more Gs than their electronic flight control system will allow
Can't see it happening either.  The Frame Stress Alert would be singing like a canary - and doing it sustained would result in a broken or possibly compromised aircraft and the aircraft being pulled in for x-rays. 

thats not to say that aircraft can't do it under limited proscribed conditions (eg wartime) - but regularly?  I have a doubt.

 

 
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gf0012-aust       4/26/2009 7:00:19 PM

And of course, all that is assuming the pilot manages to stay conscious and not just end up as a lawn dart.
which does beg the question, because there aren't too my suits in service that can keep the pilot from being non compis mentis after 9.5g

I could be wrong, but I thought the only ones that were able to keep the pilots alert and functional at 9.5 were UK, US and Sweden 
 
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french stratege       4/26/2009 7:16:14 PM
Well you are faulty GF0012
It is known M2000 is probably the only fighter (whith Rafale) which can do 11 g within structural limit (and more than the standard FBW limit of 270 ° role rate) by overriding the 9 g limit of FBW if pilot require it
Structural limit is an amazing 12g but of course with limited fuel remaining ...
Just google 11 g mirage 2000
Now I don't know if it done often since it is quite dangerous...
 
 
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gf0012-aust       4/26/2009 7:28:25 PM

Well you are faulty GF0012

It is known M2000 is probably the only fighter (whith Rafale) which can do 11 g within structural limit (and more than the standard FBW limit of 270 ° role rate) by overriding the 9 g limit of FBW if pilot require it

Structural limit is an amazing 12g but of course with limited fuel remaining ...

Just google 11 g mirage 2000

Now I don't know if it done often since it is quite dangerous...

 
I would like to see some citations.  As I said, as a special event (wartime) where limitations to action are off, I don't doubt that its possible to achieve. But to say thats its regular training behaviour I think is being somewhat cavalier.  
btw, it's not just a matter of turning off FBW, the Frame Stress Alert is (usually) separate.
I'm curious because (esp) with deltas, at 9+G the wing loading and stresses would be enormous.
 

 
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french stratege       4/26/2009 7:31:27 PM
Delta wing has advantage to be more robust than conventional wings
Now, I can not confirm for the manoeuver BW think about but I think it is credible.
 
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RockyMTNClimber    Stuff on the airframe...   4/26/2009 7:35:39 PM



And of course, all that is assuming the pilot manages to stay conscious and not just end up as a lawn dart.



which does beg the question, because there aren't too my suits in service that can keep the pilot from being non compis mentis after 9.5g




I could be wrong, but I thought the only ones that were able to keep the pilots alert and functional at 9.5 were UK, US and Sweden 


Put a 250lb appendage on the airframe at 11gs it becomes 2750lb (that is about the weight of a pylon and an empty fuel tank or most of a ECM pod). One can imagine the effect that would have upon the balance and controlability (recoverability). That means 11gs is a stunt except in as an absolute desperation manuver (one the pilot likely won't live through since he has already screwed up to get there).
 
Simply put, an aircraft in air to air combat mode & isn't able to sustain an 11g turn even if the pilot could, which he can't.
 
Check Six
 
Rocky
 
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sentinel28a       4/27/2009 2:45:38 PM
I believe Randy Cunningham in Vietnam put 12Gs on his F-4J trying to evade a MiG-17.  He survived, of course, and got back to the carrier, but the main spar of the F-4 was cracked and the aircraft didn't fly again that cruise--it had to be virtually rebuilt.  It should be noted that Cunningham had dropped his tanks by that time and was flying more or less clean, with only Sidewinder pylons left on the wings.
 
So yes, it's entirely possible that a Mirage 2000 or a Rafale could take 11Gs in a turn, but it would damage the aircraft.  Like Rocky said, it's a Last Best Move when everything else has failed and the MiG on your butt is getting ready to ventilate it.  I think Bluewings is correct that this would be a defense against a guns pass, but even then, the bad guy hopefully doesn't take it into the vertical and drop back down onto the Mirage's six.  He would have a heck of a time trying to reacquire though, so it's better than nothing.
 
No question it's an impressive manuever. 
 
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Bluewings12       4/27/2009 4:33:28 PM
I did not know that I was going to start such a discussion . Since I posted the video , I feel "oblige" to correct some posters ~including FrenchStratege~ . The M2000 's FBW seems to have 4 settings :
#1) 5G with heavy load (5.5g ultimate)
#2) 7g with supersonic wing fuel tanks and A2A missiles (7.5g ultimate)
#3) 9g with central fuel tank and A2A missiles (11g ultimate)
#4) 11g with A2A missiles only if asked by the pilot (13.5g ultimate) 
The different settings are chosen by the onboard computer who knows what the aircraft load is , obviously .
Since the Mirage serie exists (more than 40 years) , Dassault did not loose a single aircraft because of a FBW problem and I am telling the truth .

A clean M2000 (or with A2A missiles) has no problem to pull 11gs during a display ... Btw , the FBW allow a negative 3g , 4g ultimate (to protect the pilot 's brain) .
French aircrafts are not the only ones to pull 10gs or more , far from it . It is why I am surprised to see so many non-believers !?
 
Cheers .
 
 
 

 
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