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Jan 6, 2021 at 18:49 comment added Russell Borogove @OrganicMarble Basically. My engines are defined by flow rate, sea level Isp, and vacuum Isp, and I have a function to compute instantaneous Isp for a given altitude, from which I get instantaneous thrust. I assume a linear Isp vs air pressure curve, which is spot-on for the F-1. More details on my sim here.
Jan 6, 2021 at 18:19 comment added Organic Marble How do you implement "varying specific impulse with altitude"? Use a constant flowrate vs throttle setting and vary the thrust based on altitude?
Jan 6, 2021 at 1:40 history edited Russell Borogove CC BY-SA 4.0
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Nov 14, 2019 at 18:21 history edited Russell Borogove CC BY-SA 4.0
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Nov 14, 2019 at 7:13 history edited Russell Borogove CC BY-SA 4.0
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Nov 14, 2019 at 7:05 history answered Russell Borogove CC BY-SA 4.0