Bf109 test data

[klem]

Originally Posted by Kurfürst

BTW how do you measure TAS?

There are two ways I use.

One is to take the CoD C# Parameter Z_VelocityTAS for TAS which I have been doing because I was finding the calculated value to be fair bit off the game parameter (which I have now fixed and is very close to game paramater now, see second method below).

The second method is to calculate from the IAS (I_VelocityIAS), converting through Pressure Altitude, i.e. adjusted from actual baro pressure to Standard Day Pressure and then to Density Altitude which adjusts it again taking into account actual Temperature vs Standard Day Temp.

Formulas are here:
http://williams.best.vwh.net/avform.htm#Altimetry

See "Relationship of pressure and indicated altitude:" for Pressure Altitude
and
"Relationship of pressure and density altitude:" for Density Altitude.

My full method is here:
http://forum.1cpublishing.eu/showpos...6&postcount=10

.....although I have tweaked the .cs file since then simply to correct the calculated TAS. I'll try to replace the zip file over the weekend. I'm currently working on a Bf109 set.

Beware of the indicated airspeed C#parameter Z_VelocityIAS as it seems to be wrong and far too close to Z_VelocityTAS even at altitude.