Lang Propellers was a leading British manufacturer of the World War I period. Dashwood Lang took out a patent in 1909 for “an improved formation of the blades of propellers for use on airships and aircraft where greater efficiency is secured.” The curvature of blades having a “convex side and a flat side” was described in the patent application. In 1913, the organization was known as Lang Garnett & Co. Ltd, but quickly became Lang Propeller Ltd. Lang was a principal supplier to Sopwith, and was bought out by that well known aircraft builder in early 1917.

But when the United States entered World War I, the Navy needed propellers in high volume and provided funds for Dashwood Lang to found the Lang Propeller Company of America in August 1917.

This artifact was used on a 298 kw (400 hp) Liberty engine.

 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 Kingdom Type PROPULSION-Propellers & Impellers Manufacturer Lang Products Co.
 Physical Description Type: Two-Blade, Fixed-Pitch, Wood Diameter: 290.2 cm (114.25 in.) Chord: 27.9 cm (11 in.) Engine Application: Liberty, 298 kw (400 hp) Dimensions Rotor/Propeller: 290.2 x 27.9 x 27.9 x 18.4 x 1.3 x 7.9cm (114 1/4 x 11 x 11 x 7 1/4 x 1/2 x 3 1/8 in.)
Bolt Holes: 8
 Materials Wood
Varnish
Copper Alloy
 Inventory Number A19640672000 Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.