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The Chevrolet Brothers Aircraft Company, owned by Swiss immigrants Arthur and Louis Chevrolet, well known designers of automobile engines and drivers of race cars, designed this in-line, inverted four-cylinder aircraft engine. In advertisements, Louis Chevrolet was quoted as saying "Upside down is right side up." For among the advantages of the design were improved pilot visibility and propeller ground clearance. Designated Model D-4, the engine was certificated in December 1929, and became known as the Chevrolair. A D-4 engine powered Travel Air low-wing aircraft won first place in its class at the September 1930 Cleveland National Air Races.

Subsequently, the Chevrolet Brothers Aircraft Company failed and the engine design sold to the Glenn L. Martin Company of Baltimore, Maryland. Uprated and renamed Martin 333, it was recertificated in July 1930, and powered the Martin 162A Tadpole Clipper and various Driggs aircraft.

 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 1930 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Martin Motors Company
 Physical Description Type: Reciprocating, In-line, Inverted, 4 cylinders, Air-cooled Power: 89.5 kW (120 hp) at 2,100 rpm Displacement: 5.47 L (333.98 cu in.) Bore and Stroke: 114 mm (4.5 in.) x 133 mm (5.25 in.) Weight: 120 kg (265 lb) Dimensions Length 116. 2 cm (45.75 in.), Width 45.09 cm (17.75 in.), Height 87.00 cm (34.25 in.)
 Materials Aluminum, Steel, Paint, Phenolic, Rubber, Magnesium
 Inventory Number A19900256000 Credit Line Exchange with the Airpower Museum, Ottumwa, Iowa Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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