Hamilton Standard Propeller, Three-Blade, Constant-Speed, Metal


Display Status:

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.

Collection Item Summary:

The Hamilton Standard Hydromatic propeller introduced in the 1930s was a significant advance over the counterweight, controllable pitch propeller. Application of oil pressure to both sides of the actuating piston provided increased capacity and the capability of feathering or unfeathering by a single control knob. Reverse pitch permitted shortened landing roll.

With this advance, Hamilton Standard became the primary propeller manufacturer for the Allies during World War II. Virtually the entire front-line inventory, from multiengine bombers to fighter and transport aircraft, as well as a significant majority of RAF aircraft, employed Hydromatic propellers. Hamilton Standard and its three licensees--refrigerator manufacturers Frigidaire and Nash-Kelvinator, and office equipment maker Remington-Rand--produced 530,135 Hydromatic propeller assemblies during the war.

Collection Item Long Description:

Data Source

National Air and Space Museum


Credit Line

Transferred from the U.S. Air Force


  • Aluminum (blades)
  • Steel (hub and hardware)
  • Paint
  • Spinner:AluminumSteel (handle)
  • Pitch Change Regulator:
  • Aluminum
  • Steel


  • Storage: 289.6 x 335.3 x 29.2cm (114 in. x 11 ft. x 11 1/2 in.)
  • Other (Pitch Change Regulator): 25.4 x 20cm (10 x 7 7/8 in.)
  • Other (Spinner): 26.7 x 38.7cm (10 1/2 x 15 1/4 in.)
  • Other (Hub Diameter): 27.9cm (11 in.)

Country of Origin

United States of America

Physical Description

  • Type: Three-Blade, Constant-Speed, Metal
  • Diameter: Unknown
  • Chord: Unknown
  • Engine Application: Pratt & Whitney Wasp R-1830-92


PROPULSION-Propellers & Impellers

Inventory Number


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