Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer Usage Conditions May Apply Usage Conditions Apply There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page. IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu View Manifest View in Mirador Viewer

The mid-1920s saw two major breakthroughs: one-piece metal propellers and ground adjustable propellers with blades that could be manually changed before flight for optimum pitch setting. Hamilton Standard acquired this technology from its predecessor, the Standard Steel Propeller Company, which worked directly with the propeller unit of the Army Air Service at McCook Field to improve propeller design. Ground-adjustable-pitch propellers, such as this artifact, provided revenue that kept Hamilton Standard going during the dark days of the Depression.

This aluminum propeller flew on an engine produced by the Velie Motors Corporation, Moline, IL, which started in the aircraft engine field with the Model M-5, type certificated in 1928. The engine was a close copy of the 1926 Detroit Aircraft Engine Corporation Aircat, and powered the Mono Aircraft Monocoupe 70, Monocoupe 113, and Monoprep 218. Velie Motors capitalized the Mono-Aircraft Corp., also of Moline, IL, and later evolved into the Lambert Engine and Machine Company.

 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 1930 Country of Origin United States of America Type PROPULSION-Propellers & Impellers Manufacturer Hamilton Standard
 Physical Description Type: Two-Blade, Ground-Adjustable-Pitch, Metal Diameter: 195.6 cm (77 in.) Chord: 14 cm (5.5 in.) Engine Application: Velie M-5 41 kw (55 hp) Red paint on the tips of the foreward side of the blades, no paint on the aft side. Dimensions 3-D: 196.2 × 14.3 × 12.1cm, 14.5kg (6 ft. 5 1/4 in. × 5 5/8 in. × 4 3/4 in., 32lb.)
Storage (Aluminum Pallet): 123.2 × 301 × 134.6cm, 275.8kg (4 ft. 1/2 in. × 9 ft. 10 1/2 in. × 4 ft. 5 in., 608lb.)
 Materials HAZMAT: Cadmium Plating
Aluminum alloy, Steel, Paint
 Inventory Number A19700054000 Credit Line Gift of the L. L. Walker Company Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
For more information, visit the Smithsonians Terms of Use.