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SESK: Stuff Everyone Should Know · sesk.info/aero-hero-steam-engine

How did Hero's ancient steam device demonstrate rocket propulsion?

Escaping steam made a sphere spin.

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  1. A sail caught sunlight
  2. A spring turned gears
  3. Steam escaped through bent tubes ✔

Why: Hero heated water so steam entered a sphere and escaped through bent tubes. The escaping gas produced thrust that rotated the sphere.

Huh, didn't know that: The device is often called the Hero engine or aeolipile.

The dad joke
Hero's engine had a revolutionary idea, so it went in circles.
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References

Answer: Steam escaped through bent tubes. Hero heated water so steam entered a sphere and escaped through bent tubes. The escaping gas produced thrust that rotated the sphere.

  1. Aerospace Dimensions Module 4, Rockets akwg.cap.gov/media/cms/Module_4__Rockets_6660F78F20B68_4ad77.pdf
    This created a thrust that caused the sphere to rotate.
    Checked 2026-10-10.

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