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In NASA's example of a rocket reaching orbit speed, about how much of its launch weight is propellant?

About 90 percent. Rockets are mostly fuel tanks.

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  1. About 10 percent
  2. About 50 percent
  3. About 90 percent ✔

Why: The ideal rocket equation links speed change, specific impulse and mass ratio. NASA's example needs a mass ratio of 10, so nine tenths of the launch weight is propellant and only one tenth is rocket and payload.

Huh, didn't know that: That huge share of propellant is a big reason rockets drop empty stages on the way up.

The dad joke
A rocket is basically a giant snack bag that is 90 percent snacks. Best kind.
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References

Answer: About 90 percent. The ideal rocket equation links speed change, specific impulse and mass ratio. NASA's example needs a mass ratio of 10, so nine tenths of the launch weight is propellant and only one tenth is rocket and payload.

  1. NASA Glenn, Ideal Rocket Equation www1.grc.nasa.gov/beginners-guide-to-aeronautics/ideal-rocket-equation
    From the ideal rocket equation, 90% of the weight of a rocket going to orbit is propellant weight.
    Checked 2026-10-10.

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