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IDProjectCategoryView StatusDate SubmittedLast Update
01139DCS: MiG-21Bis openBetaFlight Model Humanpublic2021-06-14 12:312023-08-17 07:05
ReporterRavenus Assigned To 
PriorityhighSeveritymajorReproducibilityalways
Status newResolutionopen 
Summary01139: Sustained G-Loads & Sustained turn rate overperformance mainly at mach <0.5
Description

Issue is presented in the following forum Post :
https://forums.eagle.ru/topic/228156-new-stability-patch-ufo/page/4/#comments

Sustained load factor when comparing to VN charts from the Mig 21 75A manuals and Mig 21bis pilot operating procedures show a discrepancy of up to 0.5G of overperformance below mach 0.5. There is also slight overperformance above it but not sure if it´s in margin of error.

Furthermore, I believe this is also tied in with the very questionable turn rate of 13.5-14 degrees per second at Mach 0.3 while the sustained turn rate at mach 0.7- 0.8 is around 12.7 .

When comparing this with VN diagram at 0.32, the mig 21 is sutaining at around 2.8 G. At this speed and G load, the mig 21bis should be stalling or on the verge of, as per VN diagram.

Steps To Reproduce

Sustained turn rate at alt 1000m with 2 R3S missiles and at 7500 KG weight. Only 1st stage Afterburner.

Comparison with aircraft performance tool https://dcs.silver.ru and ingame performances analysis.

TagsNo tags attached.

Activities

Ravenus

Ravenus

2021-06-14 12:33

reporter   ~02024

MiG-21_DCS_7500_gross_weight_400_km_per_hour_G-load_fusion.thumb.jpg.a31540d8603b3470eb07fa94b7644baa.jpg (169,195 bytes)   
MiG-21_DCS_7500_gross_weight_400_km_per_hour_G-load_fusion.thumb.jpg.a31540d8603b3470eb07fa94b7644baa.jpg (169,195 bytes)   
VN diagram.png (270,281 bytes)   
VN diagram.png (270,281 bytes)   
50101f5b658748e0.jpg.440f9e53f50af78d9cb4899e706c8741.jpg (63,495 bytes)   
50101f5b658748e0.jpg.440f9e53f50af78d9cb4899e706c8741.jpg (63,495 bytes)   
chart2ddurm.png (605,521 bytes)   
chart2ddurm.png (605,521 bytes)   
Ravenus

Ravenus

2021-06-15 10:01

reporter   ~02025

Please ignore the following image as it is unrelated to the FM issue at the moment. 50101f5b658748e0.jpg.440f9e53f50af78d9cb4899e706c8741.jpg
Karasik

Karasik

2023-08-17 07:05

reporter   ~02202

Will it be fixed?

image.png.826f6a7851d8322dc7e1b3b6c2e76662.png (476,402 bytes)   
image.png.826f6a7851d8322dc7e1b3b6c2e76662.png (476,402 bytes)   

Issue History

Date Modified Username Field Change
2021-06-14 12:31 Ravenus New Issue
2021-06-14 12:33 Ravenus Note Added: 0002024
2021-06-14 12:33 Ravenus File Added: MiG-21_DCS_7500_gross_weight_400_km_per_hour_G-load_fusion.thumb.jpg.a31540d8603b3470eb07fa94b7644baa.jpg
2021-06-14 12:33 Ravenus File Added: VN diagram.png
2021-06-14 12:33 Ravenus File Added: 50101f5b658748e0.jpg.440f9e53f50af78d9cb4899e706c8741.jpg
2021-06-14 12:33 Ravenus File Added: chart2ddurm.png
2021-06-15 10:01 Ravenus Note Added: 0002025
2023-08-17 07:05 Karasik Note Added: 0002202
2023-08-17 07:05 Karasik File Added: image.png.826f6a7851d8322dc7e1b3b6c2e76662.png