This is the new thread. The original thread can be found here.
Advanced Jet Engine
Advanced Jet Engine gives jets, propellers, and rotors realistic performance in KSP. NathanKell's valiant efforts have made stock performance much more reasonable in recent versions of KSP, but it's still a very long way from realistic. AJE calculates performance for air-breathing engines based on real thermodynamics.
Real-world jet engines AJE uses thermodynamic e