Transferred from the Smithsonian Institution to the United States National Museum.
Country of Origin: United States of America
Rotor/Propeller: 100 x 26.7 x 5.1 x 0.6cm (39 3/8 x 10 1/2 x 2 x 1/4 in.)
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.