Quote:
Originally Posted by ZaltysZ
IAS will be equal to TAS at sea level only at certain air pressure and temperature. If present conditions are different (like you are flying on hotter/colder day), TAS and IAS will be different even if you are almost "surfing" the waves in your plane.
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Yes thats right but I don't have the time and skill to calculate them

My point was that it seems like there is quite a big difference between the speed gauge in the spit and 109. Countless posts on this forum complain about the spit is going too slow in level flight and most of them draw this conclution from the speed gauge alone. I'm not saying they are wrong, but reading the speed gauges gives the impression that a 109 is travelling much faster than a spit, even if they are flying side by side.