nairb121 Posted March 25, 2023 Share Posted March 25, 2023 Engine overspeeds by an extreme amount when advancing throttle to afterburner immediately after spawning in air. To reproduce: 1. Spawn in air with throttle in MIL or below. 2. Immediately advance throttle to MAX. 3. Engine hangs at ~85% RPM, temperature climbs rapidly. Afterburner does not light. 4. Reduce throttle to MIL. Engine increases to 100% and overshoots significantly, to almost 200% RPM, with excessive thrust and fuel consumption. 5. Engine after some time slows back to 100%. The duration of this overspeed seems to be proportional to the time held at MAX prior to reducing to MIL. I believe I have encountered this overspeed issue in other situations, but I have only been able to reproduce it in this manner. Track is attached. F-5 engine overspeed.trk 3 Link to comment Share on other sites More sharing options...
Sarowa Posted March 27, 2023 Share Posted March 27, 2023 (edited) I observed this behavior during air starts today as well. I remember it used to happen in some rare circumstances but it seems like it may be easier to replicate now? Edited March 27, 2023 by Sarowa 1 Link to comment Share on other sites More sharing options...
The Gray Weasel Posted April 16, 2023 Share Posted April 16, 2023 Happens to me, too. Every time I start a mission with the F-5E already in the air, the engine RPM immediately shoots up to something like 184%. I can bring the RPMs down and get the engines to respond to throttle input if I immediately pull the throttle to idle upon mission start, but if I do not do that very quickly, then the engines will become stuck in that overreved position and the only way to fix them is to shut off fuel flow and then air-start them. Link to comment Share on other sites More sharing options...
nairb121 Posted May 25, 2023 Author Share Posted May 25, 2023 Has any tester been able to reproduce this yet? Is there any additional information I can provide? Link to comment Share on other sites More sharing options...
er00ic Posted June 16, 2023 Share Posted June 16, 2023 On 5/25/2023 at 12:42 PM, nairb121 said: Has any tester been able to reproduce this yet? Is there any additional information I can provide? I don't know about any testers, but I stumbled upon it today, so ED can have another track file to ignore. mach2f5.trk 1 Link to comment Share on other sites More sharing options...
Flappie Posted June 17, 2023 Share Posted June 17, 2023 Issue reported. 1 Don't accept indie game testing requests from friends in Discord. Ever. Link to comment Share on other sites More sharing options...
The Gray Weasel Posted June 18, 2023 Share Posted June 18, 2023 I did several air starts to try to pin down exactly what the problem is. Tracks attached. In all cases, although I have turned on the option to match the aircraft controls with the HOTAs position on start, the throttle begins at about 90% dry thrust during the air start regardless of the throttle position. That's why the aircraft throttle "snaps" to another position as soon as I move the HOTAs throttle a little. In all cases, engine temperature and fuel consumption spike really high in the first few seconds of an in-air start. If the throttle is placed in idle, or even in full military power, the engines sort themselves out and start behaving normally after a few seconds, and afterburner can be selected without problems. (FullMilPowerAtStart.trk and IdleThrottleAtStart.trk.) However, if the throttle is immediately advanced to afterburner during air start, or if the throttle is advanced to afterburner during the first few seconds after air start, then engine temperature spikes way past the redline, fuel consumption increases without the AB lighting, and engine thrust output hangs at about 86% mil power. (EngineOverspeed1.trk and EngineOverspeed2.trk.) Once that happens, there is no way to get the engines working properly without shutdown and in-air restart. EngineOverspeed1.trk EngineOverspeed2.trk FullMilPowerAtStart.trk IdleThrottleAtStart.trk 1 1 Link to comment Share on other sites More sharing options...
Flappie Posted December 19, 2023 Share Posted December 19, 2023 The issue should now be fixed in OB. 1 1 Don't accept indie game testing requests from friends in Discord. Ever. Link to comment Share on other sites More sharing options...
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