su27 and F15 em diagrams?

[falcon_120]

Hi, I was looking for some EM charts about the Eagle vs the flanker both

RL or FC3 I don't mind.To better understand how or where are the strenghs of both fighters.

Which is the corner speed for the flanker? I'm not bad at all in dogfighting but even so,I'm

always curious about where should I stay to get the best out of each airframe.

Thanks in advance.

[Ironhand]

Haven't really investigated this in FC3 beyond a few quick flights but, at sea level, with 50% fuel and 4 AAMs onboard:

 

• F-15C Gross weight: 16512 Kg (36403 lbs) 360-370 knots (TAS) 26 degrees/sec Instantaneous turn rate
   
  
• Su-27 Gross weight: 21287 Kg (46930 lbs) 540-550 km/hr (TAS) 28+ degrees/sec ITR
  

 

 

Don't know about the F-15 but a bit over 28 degrees/sec is about right for the Su-27, IIRC. For sustained turn rates, the airspeeds should be a bit lower.

 

 

Rich

[IvanK]

Haven't really investigated this in FC3 beyond a few quick flights but, at sea level, with 50% fuel and 4 AAMs onboard:

 

• F-15C Gross weight: 16512 Kg (36403 lbs) 360-370 knots (TAS) 26 degrees/sec Instantaneous turn rate
  
• Su-27 Gross weight: 21287 Kg (46930 lbs) 540-550 km/hr (TAS) 28+ degrees/sec ITR
  

 

 

Don't know about the F-15 but a bit over 28 degrees/sec is about right for the Su-27, IIRC. For sustained turn rates, the airspeeds should be a bit lower.

Rich

 

Found this lurking on my PC ... unverified source:

 

Edited December 2, 2012 by IvanK

[GGTharos]

ITR is higher than STR for the same airspeed, as it should be.

 

F-15 STR hovers around 21DPS at corner, but in a light F-15 you cannot sustain it because you will be sustaining more than 10g.

 

There are STR diagrams (note that they often appear as sustained g diagrams, but g translates straight into turn rate) for both the F-15 and Su-27 coming right from their operator's manuals.

 

I have not seen ITR diagrams for the F-15, but they are more nice to have than need to have.

 

Generally speaking corner speed depends on configuration and for the F-15 is can range anywhere between 350kt and 450kt. For the Su-27 it is anywhere between 500-800kph. Also you may want to choose best vertical speed or max thrust/power ratio speed instead of best corner. It all depends on your plan, the bandit's plane, etc.

 

For example if a Su-27 can suck an F-15 down low at less than M 0.6, the Su-27 will turn better there.

Edited December 2, 2012 by GGTharos

[IvanK]

As to Instantaneous versus sustained speeds generally speed for max sustained rate will be higher than Instantaneous speed. Attached Fan plot for Mirage 2000 at 15000ft.

 

9G Vc (Max inst Rate) is around 0.65M/320KCAS looking at 23.5 deg sec

 

Max sustained rate (at around 6.5G on the 0 Ps line) occurring at around 0.9M/450KCAS

looking at around 12.5 deg sec

 

[falcon_120]

Thanks a lot to all of you,something like this is what I had in mind.

[IvanK]

Here is a chart of another well known US fighter that illustrates the relationship between Instantaneous and Sustained turn performance. its suitably vague to allow publication at the time.

 

Edited December 2, 2012 by IvanK