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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