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17 votes
Accepted

Does "% Throttle" refer to fuel flow or thrust?

For the Space Shuttle Main Engine, "% Throttle" (actually in shuttle vernacular, % Power Level), referred to the chamber pressure. It was the desired value of chamber pressure that was used ...
Organic Marble's user avatar
8 votes

Is it possible to throttle down the thrust in a rocket engine to 1% just like in KSP?

Typical rocket engines can't throttle that low, but it's possible. The widest throttle range I know of is the sustainer engine of the Lance tactical missile, at 350:1 (yes, really), meaning it can be ...
Russell Borogove's user avatar
5 votes

Are rockets deliberately throttled back towards the end of the burn to spare crew and airframe g-forces?

Partial answer submitted as a counterexample for "throttling down is done for humans onboard" The uncrewed final flight of the Saturn V, the launch of the Skylab, also "throttled down&...
Organic Marble's user avatar
3 votes

Are rockets deliberately throttled back towards the end of the burn to spare crew and airframe g-forces?

I expect the throttle-back was to limit the G-forces on the crew more than anything else. 3g is already pretty uncomfortable for a human, and anything higher could make the crew unable to respond in ...
Darth Pseudonym's user avatar
2 votes
Accepted

Is it possible to throttle down the thrust in a rocket engine to 1% just like in KSP?

It is not usually possible to throttle a rocket engine that deeply for a range of reasons and especially for liquid propellent rockets. As an example the merlin engine of the Falcon 9 booster provides ...
Slarty's user avatar
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