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[Alfie Noakes]

Lots of excellent work done at https://www.sas1946.com/main/index.php/topic,57254.msg632778.html#new

I'm particularly interested in the Fokker D VII fix.....

"Fokker D.VII gets the jitters above 150km/h......       Wing Polares wrong, lift coefficient way too high...........   Reduce Wing Polares Lift coefficient from 0.23 to 0.13"

Would some kind soul tell me, in simple terms what Polares is/are

I googled it but all I got was Stars, Missiles and Gay slang......

Cheers

Alfie

[P51vsFw190]

I’m gonna take a shot in the dark here and say that this refers to polar curve. A polar curve is a graph which contrasts the sink rate of an aircraft with its horizontal speed. I think it is basically a way to graph glide ratio......I think.

Look up Polar Curve (Aerodynamics) and you should find a better explanation than I can give.


James

[Alfie Noakes]

Crikey that was quick !

I'll do some research on  Polar Curve (Aerodynamics) when I'm back from work......

The new Fokker D VII is marvelous BTW 

Cheers

Alfie

[P51vsFw190]

You have a great day Alfie.

Enjoy!


James

[SAS~Storebror]

Apart from what James said (which is absolutely correct), "Polares" is a reference to a flight model section in IL-2 called that name.
You can see what some of the values in that Flight Model section do here:
https://www.sas1946.com/main/index.php/topic,164.msg85693.html#msg85693

In case of the D.VII, the value "Cy0_0" was set to "0.23" which moves the whole wing's lift curve up a lot.
BAT Angels High Service Pack 2 reduces that value to "0.13" for the D.VII and everything flies sweet again.

Best regards - Mike

[vpmedia]

Fokker D.VII gets the jitters above 150km/h...

Iirc turning off 'flutter effect' in the difficulty options helps too.

[SAS~Storebror]

Not in this case as the flutter effect will happen when speed is above vmax only, which would be 186.