chn6 Posted November 17, 2014 Share Posted November 17, 2014 (edited) I love DCS MiG-21Bis very much, he is better than all known flight simulation software is more outstanding, so I hope to perfect. In testing the stall and spin, I found MiG-21 in the stall after entering the spin, can be supersonic and finally explosion. I provide the attached Tacview file acmi. MiG-21Bis_FMbug.txt.rar Edited March 12, 2015 by Cobra847 [sIGPIC]http://forums.eagle.ru/signaturepics/sigpic87046_1.gif[/sIGPIC] Link to comment Share on other sites More sharing options...
Art-J Posted November 17, 2014 Share Posted November 17, 2014 Noticed the same a couple of times, when testing airplane handling in spins. It seems that MiG's flight model doesn't like flat spins, it sometimes goes crazy and accelerates the plane to supersonic speeds much faster than emergency afterburner :D. Next, before you know it, BOOOM happens. Not a big deal for me, because you usually don't spin the MiG in normal combat anyway, but this peculiar behaviour might need to be looked into somewhere in the future. i7 9700K @ stock speed, single GTX1070, 32 gigs of RAM, TH Warthog, MFG Crosswind, Win10. Link to comment Share on other sites More sharing options...
MTFDarkEagle Posted November 17, 2014 Share Posted November 17, 2014 ... it sometimes goes crazy and accelerates the plane to supersonic speeds much faster than emergency afterburner :D. Next, before you know it, BOOOM happens. Ah!! I'm not the only one encountering this!! :P Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread Link to comment Share on other sites More sharing options...
Dolphin887 Posted November 17, 2014 Share Posted November 17, 2014 Noted. Will check. However, consider: - object in a free fall from e.g. 6000m will reach ~340 m/s terminal velocity (we are ignoring the impact of drag in this case). So the terminal velocity in case of 21 spin will inevitably be very high, but i will check that drag is calculated correctly. Power through superb knowledge, training and teamwork. [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
MTFDarkEagle Posted November 17, 2014 Share Posted November 17, 2014 Noted. Will check. However, consider: - object in a free fall from e.g. 6000m will reach ~340 m/s terminal velocity (we are ignoring the impact of drag in this case). So the terminal velocity in case of 21 spin will inevitably be very high, but i will check that drag is calculated correctly. Ta. I have a track file where it happened what I quoted above, from an older version (1.2.10 if I recall correctly). If you want I can upload it. It's basically when pulling a lot of AOA, it goes out of limits, and if you keep the stick back the aircraft will dramatically accelerate up to and through mach 1 (followed by the aircraft blowing up). Lukas - "TIN TIN" - 9th Shrek Air Strike Squadron TIN TIN's Cockpit thread Link to comment Share on other sites More sharing options...
eekz Posted November 17, 2014 Share Posted November 17, 2014 (edited) I also want to mention that MiGs stall behavior is odd. See attached track.mig21_aoa.trk Edited November 17, 2014 by eekz Куплю B-17, можно B-24. B-29 не предлагать! Burning Skies =Burning Skies= @ Facebook Link to comment Share on other sites More sharing options...
iFoxRomeo Posted November 17, 2014 Share Posted November 17, 2014 I had one happening with 1.2.10 one month ago. Fox Spoiler PC Specs: Ryzen 9 5900X, 3080ti, 64GB RAM, Oculus Quest 3 Link to comment Share on other sites More sharing options...
chn6 Posted November 18, 2014 Author Share Posted November 18, 2014 THX all, thank you Dolphin887! DCS MiG-21Bis is the best one for not only DCS, and all other simulator, All chinese pilots will love it. [sIGPIC]http://forums.eagle.ru/signaturepics/sigpic87046_1.gif[/sIGPIC] Link to comment Share on other sites More sharing options...
eekz Posted January 23, 2015 Share Posted January 23, 2015 Taken in version 1.2.12 and track played on v. 1.2.14 Plane behaviour in stall is 'spiky' and looks unnatural track Куплю B-17, можно B-24. B-29 не предлагать! Burning Skies =Burning Skies= @ Facebook Link to comment Share on other sites More sharing options...
Golo Posted January 23, 2015 Share Posted January 23, 2015 Taken in version 1.2.12 and track played on v. 1.2.14 Plane behaviour in stall is 'spiky' and looks unnatural The fact that it looks unnatural to you is not prove that it is wrong. Go read manual sections on stalls and spins an you will find out about unsteady oscilations around all 3 axes. Link to comment Share on other sites More sharing options...
eekz Posted January 23, 2015 Share Posted January 23, 2015 The fact that it looks unnatural to you is not prove that it is wrong. Of course it does not prove anything. Just my opinion you know. It's up to developers whether to check it or not, and whether to fix it or not. Or to tell that its correct. Go read manual sections on stalls and spins an you will find out about unsteady oscilations around all 3 axes. I did it. I do not argue with the fact that there should be those oscilations. I doubt that they should occur in such "spiky" manner when plane inertia cant be felt. But once again, my opinion does not prove anything. If it can be explained that it is currently correct it the sim such an explanation would be much appreciated. Куплю B-17, можно B-24. B-29 не предлагать! Burning Skies =Burning Skies= @ Facebook Link to comment Share on other sites More sharing options...
Golo Posted January 23, 2015 Share Posted January 23, 2015 OK, then its a question of a magnitude and frequency of those oscilation. To be honest I was wondering about them too and also of inecial rotation effect that sometimes accompanies stalls/spins. But since I have no data on them im not questioning them because of unnatural feel. Link to comment Share on other sites More sharing options...
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