Frequently Asked Questions
What is delta-v?
Delta-v is the total change in velocity a rocket can produce by burning its propellant. It is the key budget number for any space mission, since each maneuver costs a specific amount of delta-v.
Why does reaching orbit require so much fuel?
The rocket equation is logarithmic, so doubling delta-v requires squaring the mass ratio. This tyranny of the rocket equation means orbital rockets must be mostly propellant, which is why staging and high-efficiency engines are essential.
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