SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-turboprop-gearbox

In a turboprop engine, how does the turbine turn the propeller?

Through a reduction gear that slows the spin.

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  1. Directly, at full turbine speed
  2. Through a reduction gear ✔
  3. With a long rubber belt

Why: A gas turbine spins far too fast for a propeller. A reduction gear slows the shaft down to a speed the propeller can use well.

Huh, didn't know that: The FAA says turboprops work best between about 250 and 400 mph.

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Why did the turboprop slow down? Its gears told it to take it easy.
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References

Answer: Through a reduction gear. A gas turbine spins far too fast for a propeller. A reduction gear slows the shaft down to a speed the propeller can use well.

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C) www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf
    A turboprop engine is a turbine engine that drives a propeller through a reduction gear.
    Checked 2026-10-10.
  2. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C) www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf
    Turboprop engines are most efficient at speeds between 250 and 400 mph
    Checked 2026-10-10.

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