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I would like to thank everyone for the immense help, and inform that I've found a study on modeling rockets using the forces involved: https://pages.vassar.edu/magnes/2019/05/12/computational-simulation-of-rocket-trajectories/ It works like a charm, but for some reason I still don't understand it gives out half the actual speed and half the actual altitude ...


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Which is nowhere near the speed the rocket has here near the stage separation. The video is reporting velocity in km/hour, not in m/s. 4383 m/s is 15780 km/hour -- over twice as fast as the Falcon 9 is moving at stage separation. In general, the rocket equation isn't going to give you directly usable results for the initial ascent phase of a rocket. Drag ...


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I'm leaning towards the "just coincident" explanation here. The semi-major must be >54.5 million km (and even that is too hot), as the aphelion must touch the orbit of Venus to enjoy the repeated gravity assists to reach this orbit, and the perihelion must be outside the sun. So ~57 million km is right were the trajectory constraints would ...


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This is an Oberth maneuver, getting the most out of your delta-v budget by adding velocity on top of an already high velocity. Nowhere in the solar system does one achieve greater orbital velocities than during perihelion of a Sun dive, as close as thermal management allows. At that ~100km/s velocity, every km/s of velocity added corresponds to ~14km/s at ...


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