SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/comm-cs-prop-governor

In a constant-speed propeller, what does the governor automatically adjust to keep rpm steady?

The propeller blade angle.

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  1. Fuel flow
  2. Ignition timing
  3. Propeller blade angle ✔

Why: The governor changes the blade angle to hold the rpm you selected. Faster airspeed or lighter load makes the blades take a bigger bite. Slower airspeed or a heavier load makes them flatten.

Huh, didn't know that: A constant-speed prop converts a high percentage of brake horsepower into thrust over a wide range of speeds.

The dad joke
Why did the governor get promoted? He always kept things at a steady pace.
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References

Answer: Propeller blade angle. The governor changes the blade angle to hold the rpm you selected. Faster airspeed or lighter load makes the blades take a bigger bite. Slower airspeed or a heavier load makes them flatten.

  1. PHAK ch 7, Aircraft Systems (FAA-H-8083-25C) www.faa.gov/sites/faa.gov/files/09_phak_ch7.pdf
    Once a specific rpm is selected, a governor automatically adjusts the propeller blade angle
    Checked 2026-10-10.
  2. PHAK ch 7, Aircraft Systems (FAA-H-8083-25C) www.faa.gov/sites/faa.gov/files/09_phak_ch7.pdf
    an increase in airspeed or decrease in propeller load causes the propeller blade angle to increase
    Checked 2026-10-10.

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