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All rockets have more thrust than their weight, otherwise they would not get off the ground. Hover ability comes from having a rocket engine that can throttle
by ggreer 11y ago
All rockets have more thrust than their weight, otherwise they would not get off the ground.
Hover ability comes from having a rocket engine that can throttle down enough to match the weight of the almost-empty rocket. Blue Origin's BE-3 can throttle down to 20% of its design thrust, possibly lower.[1] SpaceX's Merlin 1D can throttle down to 70%.[2] Apparently, even with only one of the nine engines firing, it's enough to lift the almost-empty Falcon 9 first stage.
1. https://en.wikipedia.org/wiki/BE-3 https://en.wikipedia.org/wiki/BE-3
2. https://en.wikipedia.org/wiki/Merlin_(rocket_engine_family)#Merlin_1D https://en.wikipedia.org/wiki/Merlin_(rocket_engine_family)#...