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Walter W. Everts of Baltimore, Maryland, invented this automatic pitch changing propeller with one blade and a counterweight. The counterweight is arranged to balance the moment generated by centrifugal force, and offset with respect to the axis of the blade in order to balance the moment generated by the traction force of the single-blade propeller. Combining their names, Everts and Frank Ellington founded the Everel Propeller Corporation. Manufacturing was done by the Sensenich Brothers of Lititz, Pennsylvania.

The air-worthiness of this unusual concept was demonstrated at Lancaster, Pennsylvania, beginning in 1937 with a Continental powered Cub aircraft, and followed with coast-to-coast flights and many other flight hours under all weather conditions. Type Certificates were received for the Taylor A and the J-2 Cub. Although tests with larger engines were accomplished, this concept was ultimately unsuccessful as a commercial venture because of an inability to compete with conventional propellers on the basis of cost and overall performance (e.g. weight).

 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
Date 1937 Country of Origin United States of America Type PROPULSION-Propellers & Impellers Manufacturer Sensenich Brothers
 Physical Description Type: Single-Blade, Variable Pitch, Wood and Metal Blade Length: 146.1 cm (57.5 in.) Width: 19.7 cm (7.8 in.) Engine Application: Continental A-40-3, 30 kw (40 hp) Dimensions 3-D: 146.1 × 19.7 × 14cm (4 ft. 9 1/2 in. × 7 3/4 in. × 5 1/2 in.)
Storage (Aluminum Pallet Storage): 182.9 × 121.9 × 38.1cm, 78kg (6 ft. × 4 ft. × 1 ft. 3 in., 172lb.)
Rehoused with A19690251000, A19340016000
 Materials HAZMAT: Cadmium Plating
Wood
Steel
Paint
Varnish
Natural Fabric
 Inventory Number A19370029000 Credit Line Gift of Everel Propeller Corp., Baltimore, Md. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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