Sure.  I meant to write up a wiki page, but that'll have to wait.  In the mean time, here's a brief overview of the parameters Area: area of the compressor/fan intake, in m2.  Note that this doesn't include the bypass.  Thrust basically scales by this.  Will be set automatically if dryThrust is set. BPR: Ratio of bypass (fan) area to core area.  Zero for turbojets, generally 0.3-0.6 for low bypass turbofans, and about 3-12 for high bypass fans.  When this is specified it's really a
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