Object Details
Manufacturer
American Propeller and Manufacturing Company
Designer
Spencer Heath
Physical Description
Type: Three-Blade, Fixed-Pitch, Wood
Diameter: 215.9 cm (85 in.)
Chord: 20.3 cm (8 in.)
Engine Application: n/a
Overall: Spruce wood
Propeller: laminated wood
Summary
An early predominant manufacturer in the United States, Spencer Heath's American Propeller and Manufacturing Company was first to use machines for mass production of aircraft propellers. 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.
Heath believed this artifact to be the first three-bladed airplane propeller, and noted that: "Three-bladed Paragons have nearly always given better results than two-bladed propellers of any type." First made in 1909, three-bladed Heath propellers served on Navy and Army Signal Corps aircraft.
Heath's rationale was: "Where the power is large or the propeller speed is low the propeller must of necessity have very high pitch in relation to diameter. In such cases the three-bladed propeller should be preferred in order to use a lower pitch without increasing the diameter."
Credit Line
Gift of American Propeller & Manufacturing Co.
Date
1914-1939
Inventory Number
A19300036000
Restrictions & Rights
Usage conditions apply
Type
PROPULSION-Propellers & Impellers
Materials
Wood
Varnish
Adhesive
Dimensions
Rotor/Propeller: 213.4 x 20.3 x 12.7 x 6.4cm (84 x 8 x 5 x 2 1/2 in.)
Other (Blade Width, 29 in. From Center): 20.3cm (8 in.)
Country of Origin
United States of America
See more items in
National Air and Space Museum Collection
Data Source
National Air and Space Museum
Link to Original Record
Record ID
nasm_A19300036000