Combining their names, Walter W. Everts and Frank Ellington founded the Everel Propeller Corporation in Baltimore, MD, best remembered for inventing an automatic pitch changing propeller with one blade. That interesting, flightworthy product was manufactured by the Sensenich Brothers of Lititz, PA, but was ultimately unsuccessful because of cost and weight.

It may be that Everel never actually manufactured many propellers because the Koppers Company, also of Baltimore, apparently manufactured more of the Everel two-blade propellers under license, which are better known under the Aeromatic name.

This four-blade artifact is an example of an automatic-variable pitch propeller developed during the late 1930s.

 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 States of America Type PROPULSION-Propellers & Impellers Manufacturer Koppers Co., Bartlett Hayward Division
 Physical Description Type: Four-Blade, Variable-Pitch, Wood and Metal Diameter: 377.3 cm (148.5 in.) Chord: 32.4 cm (12.8 in.) Engine Application: Unknown Dimensions Other (Blade): 64in. (162.6cm)
Rotor/Propeller: 32.4 x 52.1 x 26.7cm (12 3/4 x 20 1/2 x 10 1/2 in.)
Storage: 233.7 x 61.6 x 59.1cm (92 x 24 1/4 x 23 1/4 in.)
 Materials HAZMAT: Cadmium Plating
Steel
Wood
Varnish
Paint
Preservative Coating
Tape
Paper
Vinyl
Adhesive
Cork
 Inventory Number A19480163000 Credit Line Gift of the Koppers Co., Inc. Aeromatic Propeller Dept., Bartlett Hayward Div., Baltimore, MD Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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