So I decided to do some top speed and acceleration tests in DCS with the Su-27 and F-15 in a clean configuration. I expected to find the F-15 faster at all altitudes, as virtually every source including the dcs encyclopedia states the F-15 is faster at sea level and at high alt. Here are the results I got:
auto pilot was used to keep aircraft level
SL: 797knots both aircraft
1000ft- 806knots F-15 810knots-Su27
10000ft- 918knots F-15 920knots Su-27
20000ft- 1040 F-15 Su-27- 1050
30000ft- 1280 F-15 Su-27 -1135
trend continues above 30k, with f-15 remaining much faster, but i cant remember all the data lol
Acceleration tests on the other hand were as i expected: F-15 wins even when top speeds are close. Being faster to speed right except for the the last couple of knots before max. At alts where it is also faster, it simply leaves the flanker floundering behind. Not surprising since it has a better T/W ratio.
I think it is very odd that the F-15 is practically neck and neck with the 27 up to 30k, particularly at sea level, where it is often quoted as being faster. Does anyone know anything about this? I put very high stock in ED's FM's, although all sims are subject to error. What is going on here.