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How does piston motion reach a reciprocating engine's propeller?

A connecting rod turns the crankshaft.

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  1. The valves spin the propeller directly
  2. The spark plug pulls the blades
  3. The piston drives the crankshaft ✔

Why: Combustion drives a piston downward. A connecting rod transfers that motion to the crankshaft, which rotates and powers the propeller.

Huh, didn't know that: Reciprocating means moving back and forth, like a piston in a cylinder.

The dad joke
The piston and crankshaft had a moving relationship.
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References

Answer: The piston drives the crankshaft. Combustion drives a piston downward. A connecting rod transfers that motion to the crankshaft, which rotates and powers the propeller.

  1. Aerospace Dimensions Module 2: Aircraft Systems and Airports akwg.cap.gov/media/cms/Module_2__Aircraft_Systems_and_Airp_1A4CD2C6AF085_eae81.pdf
    The explosion pushes the piston downward and this energy is then transmitted to the crankshaft, which in turn powers the propeller.
    Checked 2026-10-10.

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