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Hello there, I''ve been creating MM patch to edit one engine whole day today, because it had bad velocityCurve, but when I get deeper into it I found out I'm confused what curve do what. So here's my question...we're talking about jet and propeller engines What's the difference between VelocityCurve VelCurve and VelCurveISP and between AtmosphereCurve, AtmCurve and AtmCurveISP ? The velocity curves are in m/s or Mach number because I found both describen on forum and wiki. AtmopshereCurves are all in key = atmopsheredensity - ISP or atmo density - ISP change (aka 0.8 from original ISP) Why are in some engines all four curves and in some three or two? Thanks for any replies! Example of engine I found with 4 curves, two of same type