smolderingash Posted October 23, 2023 Posted October 23, 2023 I'm no longer able to get any kind of restart going in the air. If I do a split s and cut power to idle while inverted and pulling positive g's (not negative) the right engine will flame out 25-50% of the time. Once this happens, I can no longer get this engine restarted, even with the JFS. The starting sounds also seem to be playing in a loop, with the 26-50+ percent engine rpm sound effect. Spent a good 30 minutes troubleshooting with no luck.
Rainmaker Posted October 23, 2023 Posted October 23, 2023 Need to post a track. Most likely you are not in the pos G realm. For the second part, if you engage too early you will shear the JFS mechanically and it will not start, hence the looping sound.
smolderingash Posted October 23, 2023 Author Posted October 23, 2023 When you say too early are you talking about the engine rpm is too high? I was definitely above the mach in my testing and the rpms on that engine were pretty high (~40%). If that's the case, is there a windmill restart procedure without using the JFS? I can't find much on this topic for the F-15E.
Rainmaker Posted October 23, 2023 Posted October 23, 2023 Yes. Then two things you were doing incorrectly: Way too fast Attempting engine engagement at too high of an RPM. I dont know if windmilling is enabled yet, but you would still have been way too fast for that too. It doesn't sound like you have any bugs there. That all sounds like intended behavior.
smolderingash Posted October 23, 2023 Author Posted October 23, 2023 Is this documented anywhere or do you know the actual numbers (or even just ballpark)? Like what is the upper limit of engine rpms that you can engage the JFS? This all started as I was going defensive and weren't perfect conditions to be working through an engine restart.
Solution Rainmaker Posted October 23, 2023 Solution Posted October 23, 2023 1 hour ago, smolderingash said: Is this documented anywhere or do you know the actual numbers (or even just ballpark)? Like what is the upper limit of engine rpms that you can engage the JFS? This all started as I was going defensive and weren't perfect conditions to be working through an engine restart. I do not know. Sorry. IIRC, sub 400 KCAS is a good start. And waiting till RPM is below about 30% is advised. 1 1
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