TLTeo Posted December 4, 2019 Share Posted December 4, 2019 Currently, if the AB flames out at high altitude, there is no way to get it to re-ignite (at least, none that I can find). Going back to lower altitudes does not seem to help. Should this be happening? Link to comment Share on other sites More sharing options...
outbaxx Posted December 4, 2019 Share Posted December 4, 2019 (edited) Afterburner flameout question No it should not. It shouldn’t flameout at high altitude if you fly fast and you should be able to re-ignite. There are some limits for igniting the afterburner and the different AB zones but the limit that is modeled now is not correct. http:// https://forums.eagle.ru/showthread.php?t=254364 It’s never too late to give up Edited December 4, 2019 by outbaxx Link to comment Share on other sites More sharing options...
QuiGon Posted December 5, 2019 Share Posted December 5, 2019 (edited) As outbaxx said: It's one of the long standing Viggen bugs waiting for a fix since forever: https://forums.eagle.ru/showthread.php?t=220786 If you ask me it looks like it's another bug that the devs have forgotten about, which could be prevent with a community bug tracker IMHO... At least I don't think this bug is too hard to fix, as it just looks like they forget to set reset a single boolean. Edited December 5, 2019 by QuiGon Intel i7-12700K @ 8x5GHz+4x3.8GHz + 32 GB DDR5 RAM + Nvidia Geforce RTX 2080 (8 GB VRAM) + M.2 SSD + Windows 10 64Bit DCS Panavia Tornado (IDS) really needs to be a thing! Link to comment Share on other sites More sharing options...
RagnarDa Posted December 5, 2019 Share Posted December 5, 2019 (edited) Afterburner flameout question Not forgotten just down-prioritized Edit: I have looked into it but couldn’t find what the issue was and had to divert my attention elsewhere Edited December 5, 2019 by RagnarDa DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
outbaxx Posted December 5, 2019 Share Posted December 5, 2019 The problem is that it’s not modeled correctly. Blue zone: outside envelope, above 18aoa probably. Red zone: AB zone3 will flameout, AB won’t ignite and re-ignite. AB zone 1-2 don’t work Yellow zone: AB zone3 works but AB will not ignite/re-ignite. AB zone 1-2 don’t work Green zone: AB zone 1-3 work It’s never too late to give up Link to comment Share on other sites More sharing options...
RagnarDa Posted December 5, 2019 Share Posted December 5, 2019 (edited) Afterburner flameout question That’s not what I meant. I was referring to not being able to fix it. Edit: I realize I was unclear. Edited December 5, 2019 by RagnarDa DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
TLTeo Posted December 5, 2019 Author Share Posted December 5, 2019 Why would the AB not re-ignite when going back to lower alt and speeds though (Say, Mach ~0.9 at 10km)? Link to comment Share on other sites More sharing options...
RagnarDa Posted December 5, 2019 Share Posted December 5, 2019 Because it’s a bug DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
RagnarDa Posted December 11, 2019 Share Posted December 11, 2019 Found the issue I believe and fixed it. Needs to do some manual testing and then hopefully it will make it into a patch soonish... Thanks for the reports! DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
RagnarDa Posted December 11, 2019 Share Posted December 11, 2019 Verified working. I don't know exactly what patch it will be in, probably not this week at least. DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
Skyracer Posted December 11, 2019 Share Posted December 11, 2019 Currently, if the AB flames out at high altitude, there is no way to get it to re-ignite (at least, none that I can find). Going back to lower altitudes does not seem to help. Should this be happening? Before the last update you where able to solve this. By moving the throttle to idle and than to WOT at lower altitudes. MY SYSTEM SPECS: Hardware Intel pentium 3 @ 800 MHz, 256 Mb RAM, Geforce 2 64Mb, Dell screen 1024x768 + Microsoft sidewhiner joystick + TrackIR 2 + TrackClitPro SOFTWARE: Microsoft Windows 98, Noice Attack & VIASAT PRO, SnackView Link to comment Share on other sites More sharing options...
TLTeo Posted December 12, 2019 Author Share Posted December 12, 2019 Yay! Link to comment Share on other sites More sharing options...
TOViper Posted December 12, 2019 Share Posted December 12, 2019 I sometimes also managed to solve this problem using this strategy. But IRC this was long time ago, I think it even was in versions 2.5.3 or below. Knowing about this issue when flying newer DCS versions, I stopped AB at 13500m in order to avoid it (some kind of "normal DCS Viggen procedure") :D. Visit https://www.viggen.training ...Viggen... what more can you ask for? my computer: AMD Ryzen 5600G | NVIDIA GTX 1080 Ti OC 11GB | 32 GB 3200 MHz DDR4 DUAL | SSD 980 256 GB SYS + SSD 2TB DCS | TM Warthog Stick + Throttle + TPR | Rift CV1 Link to comment Share on other sites More sharing options...
RagnarDa Posted December 12, 2019 Share Posted December 12, 2019 The issue was that the ignition would not start unless in a specific low RPM range. Also automatic reignition doesn’t start unless the RPM is lower than a threshold. If the turbine is still working and only the AB flame is out the ignition would almost never start. So I figured the AB might be relit just by ambient temp in the engine and sufficient fuel flow. DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
Skyracer Posted December 12, 2019 Share Posted December 12, 2019 The issue was that the ignition would not start unless in a specific low RPM range. Also automatic reignition doesn’t start unless the RPM is lower than a threshold. If the turbine is still working and only the AB flame is out the ignition would almost never start. So I figured the AB might be relit just by ambient temp in the engine and sufficient fuel flow. How about solving the engine återstart/relight function? MY SYSTEM SPECS: Hardware Intel pentium 3 @ 800 MHz, 256 Mb RAM, Geforce 2 64Mb, Dell screen 1024x768 + Microsoft sidewhiner joystick + TrackIR 2 + TrackClitPro SOFTWARE: Microsoft Windows 98, Noice Attack & VIASAT PRO, SnackView Link to comment Share on other sites More sharing options...
outbaxx Posted December 12, 2019 Share Posted December 12, 2019 (edited) Afterburner flameout question The issue was that the ignition would not start unless in a specific low RPM range. Also automatic reignition doesn’t start unless the RPM is lower than a threshold. If the turbine is still working and only the AB flame is out the ignition would almost never start. So I figured the AB might be relit just by ambient temp in the engine and sufficient fuel flow. The AB won’t relit unless you set the throttle in MIL power first, there is no automatic relit of the afterburner. If you are in Z2 or 3 (when it light out) there is a valve that close the fuel to the regulator so it doesn’t pump/Compressor stalls but if your in Z1 the valve won’t close and there can be a compressor stall and there is a high reduction in thrust. The throttle need to go back to Mil power before a new ignition will work. Edited December 12, 2019 by outbaxx Link to comment Share on other sites More sharing options...
RagnarDa Posted December 12, 2019 Share Posted December 12, 2019 So not quite right yet then but it works for now hehe DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
outbaxx Posted December 13, 2019 Share Posted December 13, 2019 So not quite right yet then but it works for now hehe A step forward is always a step forward :) Link to comment Share on other sites More sharing options...
RagnarDa Posted December 13, 2019 Share Posted December 13, 2019 It’s a demotion of the issue severity level at least DCS AJS37 HACKERMAN There will always be bugs. If everything is a priority nothing is. Link to comment Share on other sites More sharing options...
randomTOTEN Posted December 15, 2019 Share Posted December 15, 2019 (edited) So I figured the AB might be relit just by ambient temp in the engine and sufficient fuel flow. I don't know for sure how the RM8 (JT8D-1) afterburner works, but just going from a "general concept" perspective, there should be an independent afterburner igniter which ignites the afterburner fuel spray. Here is the relevant unit for the J79 I wouldn't be surprised to learn there is one in the RM8.:book: Edited December 15, 2019 by randomTOTEN embed doesn't work Link to comment Share on other sites More sharing options...
TOViper Posted January 18, 2020 Share Posted January 18, 2020 So not quite right yet then but it works for now hehe RagnarDa, quick question: is this patch already implemented? Today I was flying, turned off the AB at approx 14000 m, went for 20000 m in mil thrust, came back and the AB was not igniting anymore at 4000 m. Visit https://www.viggen.training ...Viggen... what more can you ask for? my computer: AMD Ryzen 5600G | NVIDIA GTX 1080 Ti OC 11GB | 32 GB 3200 MHz DDR4 DUAL | SSD 980 256 GB SYS + SSD 2TB DCS | TM Warthog Stick + Throttle + TPR | Rift CV1 Link to comment Share on other sites More sharing options...
MYSE1234 Posted January 18, 2020 Share Posted January 18, 2020 RagnarDa, quick question: is this patch already implemented? Today I was flying, turned off the AB at approx 14000 m, went for 20000 m in mil thrust, came back and the AB was not igniting anymore at 4000 m. It should be in, I had it work a few days ago. Viggen is love. Viggen is life. [sIGPIC][/sIGPIC] i7-10700K @ 5GHz | RTX 2070 OC | 32GB 3200MHz RAM | Link to comment Share on other sites More sharing options...
TOViper Posted January 19, 2020 Share Posted January 19, 2020 It should be in, I had it work a few days ago. Definitely didn't work here at Openbeta 2.5.5.41962 Visit https://www.viggen.training ...Viggen... what more can you ask for? my computer: AMD Ryzen 5600G | NVIDIA GTX 1080 Ti OC 11GB | 32 GB 3200 MHz DDR4 DUAL | SSD 980 256 GB SYS + SSD 2TB DCS | TM Warthog Stick + Throttle + TPR | Rift CV1 Link to comment Share on other sites More sharing options...
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