Packard 1A-2775 X-24 Engine
date: label: Date
content: Circa 1927
name: label: Manufacturer
content: Packard Motor Car Company (Detroit, Michigan)
notes: label: Physical Description
content: Type: Reciprocating, 24 cylinders, X-type, Liquid-cooled
label: Physical Description
content: Power rating: 969 kW (1,300 hp) at 2,700 rpm
label: Physical Description
content: Displacement: 45.5 L (2,775 cu in.)
label: Physical Description
content: Bore and Stroke: 137 mm (5.375 in.) x 140 mm (5.5 in.)
label: Physical Description
content: Weight: 761 kg (1,677 lb) (Approximate)
label: Summary
content: The Packard Motor Car Company produced the world’s first quantity-production 12-cylinder automobile in in 1916, and belief in that engine carried over to aviation in the following year. Development of the Packard X, basically two Model 1500s sharing one crank-shaft, began about 1920. A few years later, under a Navy contract, Packard built two 1A-2775 engines. The first was test flown for the 1927 Schneider Trophy race by Al Williams in a Kirkham racer, but did not compete. Williams later set an unofficial speed record of 515 kilometers (322 miles) per hour in the racer in 1927.
label: Summary
content: For the 1929 Schneider Trophy race, Williams modified the racer into a monoplane, which was designated the Mercury Racer. The aircraft was too heavy, so a second, more powerful engine was prepared. Super-charged and rated at 1,119 kW (1,500) horsepower, it was the most powerful aircraft engine in the world. However, the Navy withdrew its support, and the airplane did not race.
place: label: Country of Origin
content: United States of America
setName: label: See more items in
content: National Air and Space Museum Collection
creditLine: label: Credit Line
content: Transferred from the U.S. Navy
dataSource: label: Data Source
content: National Air and Space Museum
identifier: label: Inventory Number
content: A19710899000
objectType: label: Type
content: PROPULSION-Reciprocating & Rotary
objectRights: label: Restrictions & Rights
content: CC0
physicalDescription: label: Materials
content: Aluminum, Steel, Paint, Preservative coating, Textile, Rubber, Copper, Cadmium Plating, Ceramic
label: Dimensions
content: Other: 45 3/16 x 73 3/16 x 26 13/16 x 55 1/2 x 76 x 36in. (114.8 x 185.9 x 68.1 x 141 x 193 x 91.4cm)
label: Dimensions
content: Approximate (Weighed with Stand by Cat Forklift): 1043.3kg (2300lb.)
label: Dimensions
content: Approximate ((without stand)): 760.7kg (1677lb.)