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 artifact, which was donated by Koppers, has the Everel markings and is an example of an early variable pitch, constant speed light airplane propeller of 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 Everel Propeller Corp.
 Physical Description Type: Two-Blade, Variable-Pitch, Wood and Metal Diameter: 184.2 cm (72.5 in.) Chord: 14 cm (5.5 in.) Engine Application: Unknown Dimensions Rotor/Propeller: 184.2 x 14 x 31.8 x 11.4cm (72 1/2 x 5 1/2 x 12 1/2 x 4 1/2 in.)
Other (Shaft Hole): 1 1/2in. (3.8cm)
Other (Shaft Hole): 1 7/8in. (4.8cm)
3-D: 183.5 x 21.6 x 11.4cm (72 1/4 x 8 1/2 x 4 1/2 in.)
 Materials Wood
Steel
Non-magnetic Metal
Rubber
Paint
Varnish
Fabric
 Inventory Number A19480162000 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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