MiG-29's BFM characteristics / doubts - Page 20 - ED Forums
 


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Old 08-06-2020, 05:09 PM   #191
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Originally Posted by Airhunter View Post
Go figure. Anyone thinking the FC3 "PFM" flight models are anywhere close to the real thing are kidding themselves. They are good for producing certain numbers like turn rate, radius and thrust to weight ratio but that's mostly it.
https://www.digitalcombatsimulator.c...pport/faq/505/
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Old 08-07-2020, 12:14 AM   #192
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Old 08-07-2020, 01:56 PM   #193
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The realism of a PFM is not depend from the system modeling
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Old 08-07-2020, 01:56 PM   #194
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The realism of a PFM is depend from the system modeling
English please.
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Old 08-07-2020, 02:01 PM   #195
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The realism of a PFM is NOT depend from the system modeling
My english level is adequate for this forum, but my German is much better
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Old 08-09-2020, 01:25 PM   #196
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Don't know if I am late to the party, but regarding the turn rates and radii: I did some extensive research on the topic and it turns out that in a coordinated turn (no side slips), that has no altitude changes and with constant speed the aircraft will have smallest turn radius (TR) and highest rate of turn (RT) at the lowest speed possible. This is determined by the maximum coefficient of lift (CoL) the lift surfaces can produce, which in turn is directly connected to the maximum angle of attack (AoA) - basically just before stalling.

The slower you fly the tighter the turn and there fore the higher the turn rate.
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Old 08-09-2020, 01:35 PM   #197
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Originally Posted by Cmptohocah View Post
Don't know if I am late to the party, but regarding the turn rates and radii: I did some extensive research on the topic and it turns out that in a coordinated turn (no side slips), that has no altitude changes and with constant speed the aircraft will have smallest turn radius (TR) and highest rate of turn (RT) at the lowest speed possible. This is determined by the maximum coefficient of lift (CoL) the lift surfaces can produce, which in turn is directly connected to the maximum angle of attack (AoA) - basically just before stalling.

The slower you fly the tighter the turn and there fore the higher the turn rate.
Thank you for your time Cmptohocah.

I'm trying to know the real life values on the data below; I've been in the russian DCS forum, but its not easy.
Can you confirm if the data below sounds more or less plausible ?

MiG-29A
maximum ITR: 28 deg/sec
maximum STR: 22 deg/sec
minimum Turn radius: 300 meters at 450 km/h

Su-27
maximum ITR: 30+ deg/sec
maximum STR: 22 deg/sec
minimum Turn radius: 355 meters at 350 km/h
Pitch rate: lower than the MiG-29's (if not using Direct Control)


From:

post #1
https://www.team-bhp.com/forum/comme...-rests-us.html

slide #34
https://www.slideshare.net/mishanbgd...-su27-19577861
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Old 08-09-2020, 09:32 PM   #198
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Quote:
Originally Posted by Top Jockey View Post
Thank you for your time Cmptohocah.

I'm trying to know the real life values on the data below; I've been in the russian DCS forum, but its not easy.
Can you confirm if the data below sounds more or less plausible ?

MiG-29A
maximum ITR: 28 deg/sec
maximum STR: 22 deg/sec
minimum Turn radius: 300 meters at 450 km/h

...
I am on holidays at the moment, so I don't have access to DCS, but what I can confirm regarding MiG-29S turn performance (from memory) is:
  • at 60 degrees of bank it pulls 2G and has almost identical measured turn rate as the theoretical value, so at least for this bank angle the performance is as expected - fight tests confirmed
  • at full after-burner (AB) and carrying 2xR-27, 4xR-73, central fuel tank and 100% fuel load, the maximum sustained turn rate happens somewhere between 500 and 450km/h and the pulled G's are somewhere around 6-7. There is some degree of variation due to difficulty of maintaining the constant AoA/Gs, but this might be also a limitation of my control hardware.

    Flight conditions: standard atmospheric pressure, standard DCS temperature, below 50m MSL altitude (IAS/TAS can be considered same) and clean configuration (no flaps).
Once I am back form holidays, I do some more flight testing and post detailed results regarding the Sustained Turn Rate.

When it comes to Instantaneous Turn Rate, I had big difficulties measuring it since the maximum AoA for the MiG-29S seems to be somewhere between 22 and 25 degrees, but I will give it another try.
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Last edited by Cmptohocah; 08-09-2020 at 09:39 PM. Reason: Additional info
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Old 08-09-2020, 11:29 PM   #199
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Quote:
Originally Posted by Flаnker View Post
Review of the real pilot of the MiG-29 flight model in the DCS

Quick translation: there are many discrepancies in the DCS flight model with the real MiG29. The MiG-29 is one of the easiest aircraft to fly and land. Landing on the MiG29 is easier than on a modern Airbus
Thats not the whole truth. In a later post, he said that these discrepancies are a result of flight sim hardware not being able to replicate the feel real life Mig-29 flight controls, both in deflection and force.
FWIW I have no problems landing the Mig-29 owed to my stick extension and heavy spring set. But I see how people with lower grade hardware (presumably like the guy who wrote the post) have lots of difficulties, as the Mig-29 is insanely sensitive in pitch.
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Last edited by sLYFa; 08-09-2020 at 11:31 PM.
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Old 08-10-2020, 02:46 AM   #200
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Originally Posted by sLYFa View Post
Thats not the whole truth. In a later post, he said that these discrepancies are a result of flight sim hardware not being able to replicate the feel real life Mig-29 flight controls, both in deflection and force.
Thanx a lot for posting this essential piece of additional info.
No problem in landing the MiG-29 here either.
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