Transferred from the Smithsonian Institution to the United States National Museum.
Overall: Laminated Wood; Hub plate: Brass; Hub and Shaft Hole Reinforcement: Steel, Brass. Small propeller used for aerodynamic testing only. Not used for flight trials on aircraft or models. Constructed from narrow wooden strips glued together similar to boat planking and then sanded to a smooth airfoil cross section. Hub reinforced with a 1/16 inch (0.2 cm) thick metal plate mounted with screws, on one side only. Shaft hole reinforced with metal tube.