The Engineering Projects, Inc. was bought by General Motors in 1940 and renamed the Aeroproducts Division. It manufactured many thousands of propellers during World War II, and became a Division of Allison in 1952, which sold the propeller business to Hamilton-Standard in 1990.

This Aeroproducts Model A632S-A1 was the first self- contained hydraulically actuated constant speed propeller to be installed on a fighter aircraft, the Bell P-39 Airacobra.

 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 Allison Division, General Motors Corporation
 Physical Description Type: Three-Blade, Constant-Speed, Metal Diameter: 316.2 cm (124.5 in.) Chord: 25.4 cm (10 in.) Engine Application: Allison V-1710-85 Dimensions Rotor/Propeller: 316.2 x 25.4 x 158.1 x 50.8 x 17.8cm (10 ft. 4 1/2 in. x 10 in. x 62 1/4 in. x 20 in. x 7 in.)
 Materials Steel, Aluminum alloy, Paper
 Inventory Number A19490057000 Credit Line Gift of General Motors Corporation, Aeroproducts Division Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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