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An early predominant manufacturer in the United States, Spencer Heath's American Propeller and Manufacturing Company opened in Baltimore in 1909. Heath was first to use machines for mass production of aircraft propellers and, under the Paragon trademark, these were widely used in World War I. Like most propellers of that era, construction was a wood laminate because of light weight, strength, fabrication ease, and resistance to fatigue in a vibrating and flexing environment.

This artifact is a spare American propeller from the Liberty engines that powered the airship Roma, purchased by the United States from the Italian government for $250,000 in 1921. It was the largest semi rigid airship in the world, and crashed during test flights in 1922.

 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
Date Circa 1922 Country of Origin United States of America Type PROPULSION-Propellers & Impellers Manufacturer American Propeller and Manufacturing Company
 Physical Description Type: Two-Blade, Fixed-Pitch, Wood Diameter: 320 cm (126 in.) Chord: 28.6 cm (11.25 in.) Engine Application: 300 kw (400 HP) Liberty engine Dimensions Rotor/Propeller: 320 x 28.6 x 27.9 x 18.4 x 1.3 x 8.3 cm (10 ft 6 in. x 11 1/4 in. x 11 in. x 7 1/4 in. x 0.5 in. 3.3 in.)
 Materials Laminated wood, Museum Varnish, Paper
 Inventory Number A19330064000 Credit Line Gift of the 19th Airship Company Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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