Profile image

[ Teaser & Help ] Not-So-PEA Friendly Now, Is It?

57.6k ZeroWithSlashedO  5 months ago
Part Efficient Aircraft - Teaser & Help

Hey everyone. Zerø here. In my quest of trying to make my Part Efficient Aircrafts better (Yes, I haven't got to uploading them because I got sidetracked.) I stumbled upon the fact that I just, for whatever reason wanted to replicate.


MD F-15C Early Eagle / GD F-16A Block 10 Fighting Falcon

While I was trying to painfully re-attach the different loadouts onto the F-15C, I got curious and did some research. That research, I happened to stumble upon the P&W F100-PW-100. For some reason, I had completely looked away at the initial F100 having reliability issues. This sparked an interest in me. I for whatever reason, wanted to replicate these "quirks".

It was also this time when I stumbled upon the -200, an essentially same copy of the -100 having less reliability issues. Doesn't mean they completely fixed them. And these two engines were exclusive to the F-15 (-100), and the F-16A (-200).

And since I, and other people I asked really wanted to see this "quirk", I decided to try my hands on it, thinking I've got the basics to do it, and that it's only gonna be some minor inconvenience along the way. Boy, was I wrong.


I tried nearly everything I could, and, I actually did it! But the result wasn't as good as I was hoping. The concept itself is simple. The F100 engine had reliability issues such as stalling at high mach, stalling at high altitude, both caused by improper throttle management. The engine was also limited to just 5 minutes of afterburner usage. It also had issues with it's afterburner starts, sometimes even stalling it's engines because of it. So here's what my plan was:

  • I planned the engine to temporarily stall at 3 different situations:

    • a. Rapid Throttle Adjustments At Mach 1.4 or above;

    • b. Rapid Throttle Adjustments At 23,000ft or above;

    • c. Cancelling Afterburner during the first 2 seconds of engaging Afterburner.

  • I also planned the engine to kill itself as it reached about 5 minutes 20 seconds in afterburner use.

I actually did do these, but the engine stalls weren't exactly a... Stall. They're more like just minor gags. Yes, they do work, but they only work for a second or two, which is what I don't want. If it's an engine stall, at least it needs to last for 6 seconds.

I've tried several ways to increase it's duration, to no avail. So I turned my head around and asked you all for help. If you've got an idea on how to create a compressor stall under the conditions above, please do tell me! Help is really appreciated at this point, I'm just desperate.

Oh yeah, here are the codes I used for the time being (They're in Variables.):

EngineStall
clamp01(sum(floor(smooth((Altitude>7086.6 | IAS/343>1.65) & abs(rate(Throttle))>0.1, 1/6))))

EngineAfterburnerLimit
sum(floor(smooth(clamp01(Throttle>0.9),1/322)))

AfterburnerDelay
ceil(smooth(clamp01(Throttle>0.9),2))

Engine
EngineStall ? 0 : (AfterburnerDelay ? Throttle*1.466 : clamp01((sum(ceil(smooth(Throttle>0.9,1/25))) ? (Throttle<0.9 ? 0 : 0.9) : Throttle))-EngineAfterburnerLimit

Oh yeah, the 5 minute timer code works. And it was the only one that worked properly.