Inspired by another post here about possible speed gauge error I made a little test.
I created a mission in FMB, where I let 2 AI planes fly next to each other for some miles. One was a 109E-4 and the other a Spit 1 and they were programmed to go at 300 kph at 500 meters.
I measured the time it took for them to travel 20 km and I checked their speed gaugets (AI on).
Observation 1: The 109E-4 outran the Spit on every try No idea why they did not match speed since I used exactly the same settings on them.
Observation 2:
The airspeed gauge on the 109 red 310 kph, but the calculation gave me 325 kph=a difference of about 5%
The spits gauge showd 170 mph=273 kph, but the calculations gave me 316 kph=a difference of about 15%
I'm aware that I'm comparing IAS and ground speed here, but the difference at 500 meters should not be this big, right?
Compare theese results with Cambers table

Coincidence?
/m
Quote:
Originally Posted by camber
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