View Issue Details

IDProjectCategoryView StatusLast Update
01184DCS: MiG-21Bis openBetaWeaponspublic2022-07-07 21:42
ReporterDSplayer Assigned ToDolphin887  
PrioritynormalSeverityminorReproducibilityalways
Status assignedResolutionopen 
Summary01184: R-3S and R-3R have too high of drag compared to AIM-9B
Description

Problem:
The R-3S and R-3R (which has the same Cx and Cy values as the R-3S) have too high of drag compared to the AIM-9B (the closest contemporary missile) which causes it to not reach the same speed as the AIM-9B.

Even though the Cx_pil value is lower than all the other AIM-9s (0.01 vs 1.88), the Cx_k values are substantially higher for the R-3S and R-3R.

Graphs:

ASL = Above Sea Level and uses the right vertical scale

M = Mach and uses the left vertical scale

All tests launched at the labelled altitude while straight and level with active pause on while at Mach 1.1.

Steps To Reproduce

Use the R-3R or R-3S

TagsNo tags attached.
Attached Files
AIM-9B vs R-3S 6km (1).png (62,390 bytes)   
AIM-9B vs R-3S 6km (1).png (62,390 bytes)   
AIM-9B vs R-3S 12km (1).png (60,370 bytes)   
AIM-9B vs R-3S 12km (1).png (60,370 bytes)   
AIM-9B vs R-3S 500m (1).png (70,205 bytes)   
AIM-9B vs R-3S 500m (1).png (70,205 bytes)   

Activities

Dolphin887

Dolphin887

2022-07-07 12:59

administrator   ~02095

Missiles were tuned long ago with ED, based on documents.
Except for the 12.500m, missiles were not launched at same V0 (approx. difference is +0.1M between AIM-9B and R-3x).
Main difference is in first 3 sec after launch, and its ~0.1M.

Try testing with exactly same Vo.

DSplayer

DSplayer

2022-07-07 21:42

reporter   ~02097

I redid the entire test again while utilizing the same parameters (launched at Mach 1.1, Active Pause, Same Aircraft). Even though they were launched at the same speed, the Tacview telemetry export has varied to V0 so I've decided to include the trk and Tacview file itself. This type of test, of course, doesn't really test induced drag since they're being launched in a straight line and the R-3S's code has larger Cy values.

AIM-9B vs R-3S 500m.png (68,566 bytes)   
AIM-9B vs R-3S 500m.png (68,566 bytes)   
AIM-9B vs R-3S 6km.png (70,143 bytes)   
AIM-9B vs R-3S 6km.png (70,143 bytes)   
AIM-9B vs R-3S 12km.png (66,003 bytes)   
AIM-9B vs R-3S 12km.png (66,003 bytes)   
TestingR3Svs9B-II.trk (62,941 bytes)

Issue History

Date Modified Username Field Change
2022-07-06 02:31 DSplayer New Issue
2022-07-06 02:31 DSplayer File Added: AIM-9B vs R-3S 6km (1).png
2022-07-06 02:31 DSplayer File Added: AIM-9B vs R-3S 12km (1).png
2022-07-06 02:31 DSplayer File Added: AIM-9B vs R-3S 500m (1).png
2022-07-07 12:56 Dolphin887 Assigned To => Dolphin887
2022-07-07 12:56 Dolphin887 Status new => assigned
2022-07-07 12:59 Dolphin887 Status assigned => feedback
2022-07-07 12:59 Dolphin887 Note Added: 0002095
2022-07-07 21:42 DSplayer Note Added: 0002097
2022-07-07 21:42 DSplayer File Added: AIM-9B vs R-3S 500m.png
2022-07-07 21:42 DSplayer File Added: AIM-9B vs R-3S 6km.png
2022-07-07 21:42 DSplayer File Added: AIM-9B vs R-3S 12km.png
2022-07-07 21:42 DSplayer File Added: TestingR3Svs9B-II.trk
2022-07-07 21:42 DSplayer File Added: Tacview-20220707-142346-DCS-WhitepaperTesterR-3S-II.zip.acmi
2022-07-07 21:42 DSplayer Status feedback => assigned