Hi all, mates!
It is advisable that since the patch 4.11 each map has its own Ground Level Temperature.
This was done for to model the engine's berhavior regarding the temperature, for a more realistic "complex management" of each plane. Also, the speed and direction of speed of wind may be chosen in the FMB.
So, since 4.11 the atmosphere properties in the "IL2 World" is a bit closer to the the atmosphere of the real World.
But this complex manegement is extended to the plane's Air Speed too:
- The air density decreases with the altitude; so the TAS increases proportionally with the altitude.
- But the density of the air increases the lower the temperature, so the TAS decreases.
- The gradient of temperature, according to International Standard Atmosphere, is -6.5 C per km of altitude.
The calculation of TAS now is a complex task for us,
because all the IAS-TAS conversion tables previous to 4.11, were done for other "IL2 World", where the temperature was 0 C for all maps at any altitude, being those tables unuseful today.
I use a real
E6B Flying Computer (the famous Wizz Wheel) while I'm flying, as well as for to design my missions in the FMB. The E6B calculates the TAS for a given IAS, altitude and outside temperature: all these needed inputs may be read in the respective gauges.
There are several free "E6B emulators" for smart phones: if you are interested , look for them in Play Store.
As far as I could see, the planes try to fly at the planned IAS, up to the limit of their max designed IAS. It can be tested with any plane.
I suggest you the following test:
Fly the Me-262, because its speed gauge indicates IAS (the white needle), and TAS (the yellow needle), with the speed in km/h; fly in different maps but at the same altitude: you'll be noticed about the difference of TAS for each map. The cons of the Me-262 are this plane doesn't have an "Outside Air Temperature" gauge.
Or, alternativelly, fly a B-25J: it has in the bombardier cockpit a temperature gauge, an altimeter and an IAS-TAS gauge. The cons: the altitude is indicated in feet and the air speeds in MPH.
In both cases, for this test purpose, you can design a simple mission with the FMB only ane human pilot, indicating waypoints with reasonable speeds, from take-off up to a given cruising altitude.
Then, Fly the mission hiting de "Autopilot" key, and let the AI to command your plane: you only need read the gauges, and to check if your readings are according to the "E6B calculations".
I hope this comments may help.
S!
