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Space Shuttle: Difference between revisions
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=== The Ascent Performances === | === The Ascent Performances === | ||
Space Shuttle Main Engine thrust,[https://en.wikipedia.org/wiki/Specific_impulse ISP] , and consumption is now within a percent of the real datas (Dev version of December 2020) | Space Shuttle Main Engine thrust, [https://en.wikipedia.org/wiki/Specific_impulse ISP], and consumption is now within a percent of the real datas (Dev version of December 2020) | ||
The mixture ratio in real was around 6, and it is what we observe in the sim (6 times more liquid Oxygen burnt than liquid Hydrogen). Hence, Main Engine Cut Off ( MECO) time is matching real one. Plus, the propellant remaining at MECO, called the Final Performance Reserve (FPR) is now within a percent ( 15000 pounds). It makes launch with high payload into a high inclination Orbit (towards ISS typically) really interesting and limitating performance wise, like in real. | The mixture ratio in real was around 6, and it is what we observe in the sim (6 times more liquid Oxygen burnt than liquid Hydrogen). Hence, Main Engine Cut Off (MECO) time is matching real one. Plus, the propellant remaining at MECO, called the Final Performance Reserve (FPR) is now within a percent (15000 pounds). It makes launch with high payload into a high inclination Orbit (towards ISS typically) really interesting and limitating performance wise, like in real. | ||
An interesting read about that FPR, written by a former Shuttle Flight Controller: [https://waynehale.wordpress.com/2014/10/08/understanding-sts-93-the-key-is-mixture-ratio/ Wayne Hale: The key is Mixture Ratio] | An interesting read about that FPR, written by a former Shuttle Flight Controller: [https://waynehale.wordpress.com/2014/10/08/understanding-sts-93-the-key-is-mixture-ratio/ Wayne Hale: The key is Mixture Ratio] | ||