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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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FJV    Problem is   5/11/2009 4:54:44 PM
I have done no finite element analisys on any of the planes mentioned, so there's no way of knowing, really.
 
Why is everybody so intent on putting data here for which there is no means of verification and being so c%cksure about it? Why should I believe such stuff on the basis of "Some guy on the internet said so"?
 
 
 
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PierreLeGrand       5/11/2009 5:04:38 PM

I have done no finite element analisys on any of the planes mentioned, so there's no way of knowing, really.

 

Why is everybody so intent on putting data here for which there is no means of verification and being so c%cksure about it? Why should I believe such stuff on the basis of "Some guy on the internet said so"?


 

 


Yes there are WAYS just reading the document provided.
 Dassault aircrafts are stressed at 1.9, this is 1.9 X 9 g, industrial standards are 1.5, on the F-35 this is even lower since thay are all limited structuraly to 9.0 g a Rafale or Mireage 2000 CAN pull more than 9 g, (11 g to be precise) in case of emergency and suffer no eccesive structural stress.
 
  In sone extreme cases this limit was incidentaly passed, the aircrafts was "bent" but restaured to flying conditions later.
 
  The fact that people doesn't know doesn't MEAN facts aren't what they are, it just make them ignorants...
 
  Regards, PlG
 
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Das Kardinal       5/11/2009 7:02:48 PM
How does the pilot cope with 11G maneuvers ? Even though they certainly sustain those for a very short time.
 
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PierreLeGrand       5/11/2009 7:18:57 PM

How does the pilot cope with 11G maneuvers ? Even though they certainly sustain those for a very short time.
  Pilot have been known to cope with more and recover quickly as well as die from g locks at 6 g.
  Physiology is not an exact science but a variable even from a day to the following and the same pilot.
 
  BTW to give you an idea try RedBull racing they take 9 g all day long without g suits.

 
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Bluewings12       5/11/2009 8:00:24 PM
Sustained turns are more dangerous to the pilot than instantaneous ones . Being able to put the aircraft 's nose where the target is very quickly (crab slide) avoids taking the Gs and getting the kill .
The M2000 was and still very good at it but the Rafale is the new benchmark .
 
Cheers .
 
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PierreLeGrand       5/11/2009 8:14:42 PM

Sustained turns are more dangerous to the pilot than instantaneous ones . Being able to put the aircraft 's nose where the target is very quickly (crab slide) avoids taking the Gs and getting the kill .

The M2000 was and still very good at it but the Rafale is the new benchmark .

 

Cheers .




Spot on +1
 
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Bluewings12       5/11/2009 8:45:30 PM
""avoids taking the Gs and getting the kill""
 
Sorry , read : avoids taking the Gs and you get the kill .
 
Cheers .
 
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warpig       5/11/2009 10:59:31 PM




Sustained turns are more dangerous to the pilot than instantaneous ones . Being able to put the aircraft 's nose where the target is very quickly (crab slide) avoids taking the Gs and getting the kill .



The M2000 was and still very good at it but the Rafale is the new benchmark .



 



Cheers .











Spot on +1


 
<sigh!>
 
Actually, a high G onset rate brought about by loading up the jet too quickly even if only for a brief time can be more debilitating than high sustained Gs.  A high G onset rate can bring about a GLOC condition even when the maximum Gs sustained are in what is usually a safe range.

 
 
Quote    Reply

PierreLeGrand    @warpig    5/12/2009 3:08:17 AM
G onset like any other g datas is measured by m/sec2 = g.
 
At Edward AFB its is computed using the following datas:
 
2.300 ft geometric altitude and 32.136 ft/sec2 g value.
 
As everyone writing on the subject should know, gravity varies with altitude but also geographic location with noticeable variations ranging from, 0.26 to - 0.27.
 
  As i have spent some time at BA-102 myself, knows its location (as well as that of the video meeting and aircraft type bases, btw not Dijon-based 5F but 2000DA) I can certify that local g values are within these parameters.
 
  Much the same way, i can safely assume that Maximum load values are perfectly valid in this particular case...
 
  The amount of g pulled here is below the level requiered to cause structural damages to the airframe by at least two units.
 
Regards, PlG
 
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Seagull       5/12/2009 6:24:53 AM

I have done no finite element analisys on any of the planes mentioned, so there's no way of knowing, really.

Why is everybody so intent on putting data here for which there is no means of verification and being so c%cksure about it? Why should I believe such stuff on the basis of "Some guy on the internet said so"?

You choose what you want to believe, who you want to trust. The main necessity here is that no one lacks respect toward others.
 
Claiming absolute negative BS against Rafale because BW and FS have been boring with very positive opinions about Rafale is stupid too.
Insulting the others because "they are wrong while i'm right" is stupid too.
 
You're free to choose.
 
Another thing i may want you to believe, since i trust the guy who told me this for obvious reasons :
Dassault has been working a 90hPa "Combat-Edge"-like equipment to make Rafale pilots capable of sustaining 11G so as to increase their survivability in case of emergency as well as for combat. This equipement finally was not adopted because it was not confortable (temperature).
 
The true software limit on Rafale is... 8G (Gs and G-onset are limited to protect the backseater). Once you pull stronger on the stick, you're free up to 11G, but pilots  usually do not exceed 9G, which is usually enough, and already extremely demanding.
 
 The BW claims about 10 to 11G in demonstration surprise me, but i can't deny them.
 
Claiming that new gen aircraft will fail above 9G is stupid, or just jealousy. Why would the Libelle G-suit could help a pilot in sustaining 12G if the aircraft can't do it ?
 
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PierreLeGrand       5/12/2009 6:36:00 AM




I have done no finite element analisys on any of the planes mentioned, so there's no way of knowing, really.



Why is everybody so intent on putting data here for which there is no means of verification and being so c%cksure about it? Why should I believe such stuff on the basis of "Some guy on the internet said so"?



You choose what you want to believe, who you want to trust. The main necessity here is that no one lacks respect toward others.

Claiming absolute negative BS against Rafale because BW and FS have been boring with very positive opinions about Rafale is stupid too.

Insulting the others because "they are wrong while i'm right" is stupid too.

 You're free to choose.

Another thing i may want you to believe, since i trust the guy who told me this for obvious reasons :

Dassault has been working a 90hPa "Combat-Edge"-like equipment to make Rafale pilots capable of sustaining 11G so as to increase their survivability in case of emergency as well as for combat. This equipement finally was not adopted because it was not confortable (temperature).

The true software limit on Rafale is... 8G (Gs and G-onset are limited to protect the backseater). Once you pull stronger on the stick, you're free up to 11G, but pilots  usually do not exceed 9G, which is usually enough, and already extremely demanding.

 The BW claims about 10 to 11G in demonstration surprise me, but i can't deny them.
Claiming that new gen aircraft will fail above 9G is stupid, or just jealousy. Why would the Libelle G-suit could help a pilot in sustaining 12G if the aircraft can't do it ?



+1.
 
This goes some major way to prove that you know your aircraft that little and it's all credit to you, you see i just forgot this little "detail" myself and yet just read the early test flyight report for the tenth time, to my credit i was more into structural loads than the real FCS soft limitations...
 
Regards. PlG
 
 
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warpig       5/12/2009 8:06:17 AM

G onset like any other g datas is measured by m/sec2 = g.

 

At Edward AFB its is computed using the following datas:

 

2.300 ft geometric altitude and 32.136 ft/sec2 g value.

 

As everyone writing on the subject should know, gravity varies with altitude but also geographic location with noticeable variations ranging from, 0.26 to - 0.27.

 

  As i have spent some time at BA-102 myself, knows its location (as well as that of the video meeting and aircraft type bases, btw not Dijon-based 5F but 2000DA) I can certify that local g values are within these parameters.

 

  Much the same way, i can safely assume that Maximum load values are perfectly valid in this particular case...

 

  The amount of g pulled here is below the level requiered to cause structural damages to the airframe by at least two units.

 

Regards, PlG



 
What are you mumbling about?  What is it with BW and apparently you, too, that you two appear driven to try to have some sort of googled-up response to every post, like you are trying to demonstrate you "knew that all along" or something.  By the way, that's an interesting point about how the force of gravity varies over the Earth's surface.  I had forgotten about that fact, but you're absolutely right that it does change slightly.  But if your comment meant that gravitational force experienced here on Earth's surface varies in the range 0.73G to 1.26G, I say that's way off, and I'd bet the fluctuation is more like 0.999G to 1.001G at most.  In any event, it has nothing to do with what I was talking about.
 
G onset rate is the rate at which you change your load factor, i.e., Gs.  For example, yanking the stick back into your lap and piling on 6Gs very quickly, like within a couple tenths of a second, can easily be more likely to cause GLOC than pulling the stick back over the course of a couple seconds and slowly building up to 8Gs.
 
 
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PierreLeGrand    @warpig    5/12/2009 9:12:45 AM
What are you mumbling about?
 
What you obviously dont know coming up with such things as "G onset" which btw is properly spelt as g onset and got your estimates on the changes in hearth gravity widely under what they really are...
 


But if your comment meant that gravitational force experienced here on Earth's surface varies in the range 0.73G to 1.26G,
 
 
 

 
These are the values used at the USAF flight Testing Center of Edward AFB and the French EPNER, if you know better than they do please apply for the position of director of flight testing Ops they'll send you a checque immediatly for travel expenses.
 
  Next:
 
 You could do with computing the variables due to your testing altitude, Heading and Speed at normal load factor.
 
  Then only could you have a proper idea of what your g onset value is.
 
 
 
 In any event, it has nothing to do with what I was talking about.
 
It has everything to do with what you where talking about being the proper way to calculate any g datas including onsets.
 
 
 
G onset rate is the rate at which you change your load factor, i.e., Gs.
 
You insist in spelling it wrongly and trying to lecture people who are well aware of what g onset is as well as knowing what you don't know about gs...
 
So please try again: How to compute g onset: m/sec2 = g.
 
And if you whant to be very precise about it you WILL use the local geometric altitude, g values, heading, speed  because it variates enough from one geolocation to the other as  to make such a difference at every levels (including design) that lifes can be put at risk.
 
Aeronautic is as much as possible a precise science and next chaper is about effect of heading on drag coefficient.
 
So please do not serve me g onsets as my little resume m/sec2 = g. (very much simplified i'm afraid) is all you need to do to compute it at your level.
 
  Source is:
 
Technical Information Handbook.
 
Air Force Flight Test Center, Edward Air Force Base Edition 2000 updated 2003. 
 
I think it is available for public use these days.
 
Regards, PlG
 
 
 
 
 
 
 
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StevoJH       5/12/2009 9:16:35 AM




G onset like any other g datas is measured by m/sec2 = g.



 



At Edward AFB its is computed using the following datas:



 



2.300 ft geometric altitude and 32.136 ft/sec2 g value.



 



As everyone writing on the subject should know, gravity varies with altitude but also geographic location with noticeable variations ranging from, 0.26 to - 0.27.



 



  As i have spent some time at BA-102 myself, knows its location (as well as that of the video meeting and aircraft type bases, btw not Dijon-based 5F but 2000DA) I can certify that local g values are within these parameters.



 



  Much the same way, i can safely assume that Maximum load values are perfectly valid in this particular case...



 



  The amount of g pulled here is below the level requiered to cause structural damages to the airframe by at least two units.



 



Regards, PlG








 

What are you mumbling about?  What is it with BW and apparently you, too, that you two appear driven to try to have some sort of googled-up response to every post, like you are trying to demonstrate you "knew that all along" or something.  By the way, that's an interesting point about how the force of gravity varies over the Earth's surface.  I had forgotten about that fact, but you're absolutely right that it does change slightly.  But if your comment meant that gravitational force experienced here on Earth's surface varies in the range 0.73G to 1.26G, I say that's way off, and I'd bet the fluctuation is more like 0.999G to 1.001G at most.  In any event, it has nothing to do with what I was talking about.

 

G onset rate is the rate at which you change your load factor, i.e., Gs.  For example, yanking the stick back into your lap and piling on 6Gs very quickly, like within a couple tenths of a second, can easily be more likely to cause GLOC than pulling the stick back over the course of a couple seconds and slowly building up to 8Gs.

 

Can't we just say that 1G = 9.8m/sec^2 and be done with it? The variation would be miniscule anyway.
 
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PierreLeGrand    StevoJH    5/12/2009 9:38:42 AM
You are right!
 
 My quote on known location was VERY sarcastic; meaning it "happened on hearth".
 
I know what our aircrafts Max Load Factor are since Mirage III and FCS soft/hard limits since Mirage 2000 and I can tell you that to world's standards they are built like bricks.
 
High g doesn't only occur in a controled way sometimes aircraft goes out of control and values of up to 30 g have been recorded in many occasion, in all axis with different result depending on the axis, altitude and of course aircraft.
 
The best example i can give to you is the USN A4 Skyhawk which leading edge slats could open independently, sometime creating a roll movement with a g onset (recorded) of 30 g, one guys was lucky enough to recover from the black out and brought it RTB with most rivets poped out from the wings, i am not sure it flew again though...
 
 So it came to no surprise to me that some jockey could pull 11 g in an instantaneous turn and go away with it when he signed off the aircraft to the techies.
 
This would be the main problem with AdA, there are stress "witnesses" if i can say so, if an aircraft goes above the limit the ground crew will know it at the post-flight visit, whatever the pilot does about it, even without looking at the flight recorder, and they don't like when their machines come back home all bent.
 
What i was demonstrating there was that  the g values of 11 were totaly possible physicaly and operationaly since we are looking at 11 g vs a Maximum Load Factor 1.9, I don't see where the problem would be with the aircraft structural fatigue.
 
Regards, PlG
 
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