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.

Display Status

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

Object Details
Country of Origin United States of America Type PROPULSION-Propellers & Impellers Manufacturer Hamilton Standard
Physical Description Type: Three-Blade, Constant-Speed, Metal Diameter: Unknown Chord: Unknown Engine Application: Pratt & Whitney Wasp R-1830-92 Dimensions 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.)
Materials Aluminum (blades)
Steel (hub and hardware)
Spinner:AluminumSteel (handle)
Pitch Change Regulator:
Inventory Number A19601414000 Credit Line Transferred from the U.S. Air Force Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.