![]() ![]() So I've been having climb performance issues and I came to the forums to determine what may be wrong. So I don't really see anything unrealistic about the temperatures you're observing. ![]() That's about 280 knots IAS at that altitude - sounds about right. That gives you a ram rise of 18 degrees, corresponding to about 370 knots TAS according to the formula above. Assuming the ISA lapse rate, the SAT at that altitude should be -10 degrees. Let's take your data point of +8 degrees (I assume this is TAT) at 16,000 ft. If the temperature seems to increase as you climb further, that may simply be due to the fact that you're accelerating as you pass 10,000 ft. An SAT of +2 at 10,000 ft also sounds about right - at the standard ISA lapse rate of 1.98 degrees per 1,000 ft, that corresponds to +22 degrees at sea level. Since your TAT is +12 and your SAT is +2, you've got a ram rise of 10 degrees, which corresponds to a TAS of around 280 knots - that seems about right. The FSUIPC documentation for the variable 34A8 calls it the "ambient temperature" - I assume this means SAT. Wikipedia has more details: An approximate formula for the ram rise is TAS^2/87^2. The difference between SAT and TAT is called the ram rise. TAT is equal to SAT only if you are stationary (zero knots). ![]() Also, for the same SAT, TAT changes with airspeed. As others have pointed out, the TAT (total air temperature) is higher than the SAT (static air temperature) because of adiabatic compression (mainly). ![]()
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