Su flight model please
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you have a missing installed thrust value? and engine type not present in the in the config provided.
Talk more on ts later today mate
CheersAre you refering to the 70k feet entries for full mill ??
Theres no “engine type” entry ??? -
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F-18c uses Advanced Flight Moddel
Migs Su EF etc use the “old” standard FM
……Shad
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Those lines doesn’t do anything, it’s just notes.
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This I did know mAX thanks for pointing it out.
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I used the thrust tables supplied by Arty with reference to improvements/current specs for the Su-30mkk/mki.
Edit If you see any radical errors let us know.I do not know what method / aspect was choosen to extapolate the curves where was no data available.
Alt 10000
13260 12750 12750 13005 13515 14025 14407.5 14662.5 14662.5 14000 13000 10000 90000Ninety thousand…? I know at 10k feet Su-27 never reach M2.5.
I not not understand how you interpolated the available RL curves into original alt breakpoints. Why didn’t you change the alt breakpoint according to RL data an let exe interpolate the between the RL thrust curves?
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Your values comparing with RL data with some exrapolation to 0 speed.
At sea level your thrust is a bit above the RL curve.
On 6,09 km your thrust is bigger than on 5 km in RL.
On 10,97 km your thrust is bigger than on 11 km in RL. Not too much just a little bit.
I recommend to use as breapoint the RL altitude data. Set as many mach breakpoint as many required to linearization. With Excal is not too hard issue to copy the RL curve. On lower alt of cource the speed limited by air density and drag. Where RL curves ends I recommend to use constant thrust, the last available data.
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Here is an Excel table.
http://www.mediafire.com/?vtftvf9pnqzqvx8
I made the RPM 100 (mil thrust) data and as a template Full AB is almost done, one or two more data line should be added.
For AB thrust I have no idea where should be the 0 level. In this table this value is 80000 feet, the last altitude breakpoint. -
I do not know what method / aspect was choosen to extapolate the curves where was no data available.
Alt 10000
13260 12750 12750 13005 13515 14025 14407.5 14662.5 14662.5 14000 13000 10000 90000Ninety thousand…? I know at 10k feet Su-27 never reach M2.5.
I not not understand how you interpolated the available RL curves into original alt breakpoints. Why didn’t you change the alt breakpoint according to RL data an let exe interpolate the between the RL thrust curves?
Minor typo in a area of no consequence, but thanks for spoting it.
Most of what I did was graphical as exact numbers are are of disputable importance in this situation where Thrust data for most other Airframes Stand Flight Models are allso above rated output. Compare MKK new to old @ Mil thrust 18615/18474.8 & AB 39525/38663.3
Yes I have used factor for increased performance above AL-31f rated figures. Remember the MKK is a Chinese export version.
Even look at the F-16 AFM Thrust data eg Mil 31000lb @ sea level/mach1.2 , & AB of 42000.0 lb ???More on that latter, I got to go fly, there waiting on me ……Shad
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I do not know what engines have the MKK or MKIs. For me Su-27 is important, therefore I stick to original curves.
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I do not know what engines have the MKK or MKIs. For me Su-27 is important, therefore I stick to original curves.
MKI Engine = AL31F
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I was not 100% accurate. I know the AL-31F as a designation, but we do not have thrust curves. If anything was changed in air inlet control…
I will check how it looks other 4th gen. figter thrust curve in BMS4 to get some data what should be done with RPM 70 for Su-27, then I can make comparsion flights with my thrust data by using Tacview.
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Keep stepping on a rake
FM Su-27 in the BMS is completely incorrect. -
My skills and knowledge ends at thrust modeling.
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@OSD:
Keep stepping on a rake
FM Su-27 in the BMS is completely incorrect.Please share the correct values
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aerodynamic data for Su-27 classified
what is in the public domain, is sufficient to construct the trajectory model
read РЛЭ Су-27 книга 1 and РЛЭ книга 2 and many many calculations -
read РЛЭ Су-27 книга 1 and РЛЭ книга 2 and many many calculations
Please translate the docs …
or
Build a good Su-27 AFM model and propose it for implementation …
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Please translate the docs …
or
Build a good Su-27 AFM model and propose it for implementation …
It’s fantastic
I have spoken only of a simple FM
For the advanced model, you will not find data on the network
You can contact with ЦАГИ http://www.tsagi.ru/rus/, this is a joke -
So far I’m happy with the low alt thrust characteristics with top speed at a max of 1.2 mach, still slower then the F-16 or F-15.
However:
Top speed @ altitude creeps up too 2.5mach which is above what it should be (2.0).
I’m looking at drag data and seeing values for Mach 2.5 that seem way to low.
Spent the last few days reserching “drag” & can still see no good reason for this deviation in the CD table.
Even a quick look at F-15/F14/F16/Mig-23/Mig-29/EF tells me it can’t be right.I will try projected values for the mach 2.5 breakpoint to stabilize top speed back to mach 2.0
But other then that its now flying with greater predictability & responsiveness.
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I do not know the drag values, therefore for jets I’m to careful to touch them. In combat the subsonic and max. M1.4 range is important. Even with partially armed fighters rarely fly faster then M1.4.
(As I know generally a typical 4th gen, supersonic capable fighter - except MiG-25, but it is not 4th gen. - spend less than 2% of total lifetime in supersonic range.)