wip Some AA missile range seems need tweaking.

[riojax]

Happy holidays to all,
I did a very simple DCS missile research, showing very strange behavior:
1. Huge AIM-7M distance regarding other SARH missiles.
2. Huge AIM-9(all variants) distance regarding other short IR missiles.
3. Very small difference between R-27ET/ER and R-27T/R
4. It's strange that the R-77 performance was lower than AIM-120B.
5. Also the SD-10 performance is significant lower than the AIM-120B, too strange.

* Yes, I know that a lot variables was ignored here, like the engine burn rate, missile drag, etc. but this was a simply missile launch in straight line (without any missile maneuver) at 29.92inHg +20ºC launched at 200ft and max plane speed, without wind and also without missile loft.

 

MISSILE    DISTANCE*
--------------------
AIM-54A60  33.10nmi
AIM-54A47  31.75nmi
AIM-54C47  30.70nmi
AIM-120C   15.45mmi
AIM-7M     14.42nmi
AIM-120B   14.40mmi
SD-10      12.50nmi
R-27ER     11.85nmi
R-77       10.62nmi
S-530D     10.60nmi
R-27ET      9.70nmi
R-27R       8.65nmi
R-27T       8.01nmi
AIM-9X      7.92nmi
AIM-9M      7.65nmi
AIM-9L      7.62nmi
AIM-7MH     7.62nmi
RB-74       7.10nmi
PL-5II      6.60nmi
RB-24J      6.05nmi
R-73        5.08nmi
R-550       4.30nmi
R-60M       4.25nmi
R-60        4.22nmi
R-3R        3.95nmi
R-13M1      3.65nmi
R-3S        3.55nmi

Anyway, take that data with a pinch of salt, and think that this message is only to show something strange that must to be reviewed by the developers, probably some behavior will be ok, and other must need some tweaking.

 

P.S. I have a lot of tacview raw files showing this data, if anyone is interested PM me.

Thank you for your time,
Regards.

Edited December 27, 2020 by riojax
typo

[dundun92]

Unfortunately that is not the best way to test missiles, and is not representative of the missiles actual performance, though it is a good effort. The best parameter to compare missiles is the stern WEZ, or max tail chase range. I have done quite a bit of testing, and this doc contains some of the results: https://drive.google.com/file/d/1In3JaNj17IRoTlVFrM3AWy7JLO2OEMcZ/view?usp=sharing

Pay particular attention to the "NEZ" parameter, as i measured it using the stern WEZ.

[riojax]

On 12/28/2020 at 5:42 PM, dundun92 said:

Unfortunately that is not the best way to test missiles, and is not representative of the missiles actual performance, though it is a good effort.

 

With all my respect, but this test was aimed only to test the dV of missiles, and I think that it's a good approximation, of course it can be done better and with less errors, but remember, here we only want analyze the dV.

 

As the test was ~0 AGL and the missile don't maneuver, the CL or other lift/drag variables impact are very minimized, being almost the pure rocket burn impulse. This is the only variable to show and test here, and it seems weird for a lot missiles. I don't have the real data, time and DCS internals knowledge to make a better study, due that I left this to developers as a hint for future missile engine tweaking. Of course this is not aimed to discuss what missile is better or what method is better to do that. That's only a handy list to help to developers where to look regarding only to pure dV fixes.

 

Anyway, thank you for your time and reading.

Edited December 30, 2020 by riojax

[NineLine]

Work continues on missiles, we appreciate the effort, but we look at missiles on a whole, not one part. Thanks!