Inconsistent drag modelling between R-27R(T) and R-27ER(ET). One of the two is not performing correctly.

[Max1mus]

All the information below is public and posted by ED.

The R-27R in DCS has a 20% energy reserve compared to EDs real-life Su-27 DLZ simulator at all altitudes. The R-27ER does not. It is noticable that the difference between the graph from the manual and the DLZ in the real Su-27 is always 20%, no matter which R-27 variant or what altitude.

What this means is that either all the documents are wrong, and the DCS R-27R is overperforming by about 10%, or the R-27ER is underperforming by about 10%. I could not find the DLZ values for 5 and 10km for the R-27ER, but the difference between the diagram and DCS is the biggest at low altitude.

 

Hit condition is target speed+150 m/s.



Uncut version of the documents below:
 

Spoiler

Tracks:
ER_ingame_1km.trk
R_ingame_1km.trk
R_ingame_10km.trk

DLZ simulator proof:

Spoiler

R-27ER 1km:

R-27R 1km:


R-27R 10km:

 

Edited July 9, 2021 by Max1mus