SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-solid-rocket-cant-shut-off

What is a big drawback of a solid-fuel rocket motor?

Once lit, it cannot be shut off. It burns until the propellant is gone.

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  1. It cannot be shut off once ignited ✔
  2. It only works inside the atmosphere
  3. It must be refueled during flight

Why: A solid motor's propellant is packed in its case and burns from start to finish once ignited. That makes it simple and powerful, but the crew cannot turn it off or throttle it like many liquid engines.

Huh, didn't know that: Modern launch vehicles often use solid motors as strap-on boosters.

The dad joke
Why are solid rockets bad at board games? Once they start, they cannot stop.
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References

Answer: It cannot be shut off once ignited. A solid motor's propellant is packed in its case and burns from start to finish once ignited. That makes it simple and powerful, but the crew cannot turn it off or throttle it like many liquid engines.

  1. NASA Science, Basics of Space Flight, Chapter 3 science.nasa.gov/learn/basics-of-space-flight/chapter3-2
    Once ignited, a solid rocket cannot be shut off.
    Checked 2026-10-10.

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