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The Challenger engine, which followed the water cooled Curtiss V-8 OX-5 engine that powered the World War I JN-4 “Jenny” trainer aircraft, was designed as a lower-cost, medium-power engine specifically intended for small commercial cabin aircraft and open cockpit sport planes. The engine received its original Approved Type Certificate (No. 5) in 1928, which was revised and re-issued in 1930.

The small, compact configuration of two staggered rows of three cylinders was intended to provide better dynamic balance and, thus, smoother operation, as well as low frontal area for improved airframe streamlining and better pilot visibility. However, although being economical, the Challenger did not run smoothly, and was frequently replaced by aircraft owners because of a vibration problem.

The Challenger powered a variety of aircraft types including the Curtiss Robin, Curtiss Fledgling, Curtiss Tanager, Curtiss-Wright Sedan 15-C, Command-Aire Model 5C3, and Eastman Sea Rover E-2.

 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 Circa 1928 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Curtiss Aeroplane and Motor Company
 Physical Description Type: Reciprocating, 6 cylinders, two-row, radial, air-cooled Power rating: 138 kW (185 hp) at 2,000 rpm Displacement: 9.88 L (603 cu in.) Bore and Stroke: 130 mm (5.125 in.) x 124 mm (4.875 in.) Weight: 190.5 kg (420 lb) Dimensions Diameter 108.3 cm (42.6 in.)
 Materials HAZMAT: Magnesium
Aluminum, Steel, Copper, Rubber, Paint, Preservative coating
 Inventory Number A19490008000 Credit Line Gift of Wright Aeronautical Corporation Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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