Engine, Aircooled Motors (Franklin) O-335-5D, Horizontally-Opposed 6
Several engineers of the failed Franklin Automobile Company of Syracuse, New York, a manufacturer of air-cooled automobiles, formed Air Cooled Motors in 1935. By 1938 a range of flat-4 and 6 aircraft engines was being produced, retaining the Franklin name.
Installed vertically, with a fan providing additional engine cooling, the O-335-5D powered the Bell TH-13M Sioux helicopter and its civil counterpart, the Model 47.
In 1975, the company disbanded and sold all rights to the Polish government, becoming part of PZL, an association of Polish aero and engine manufacturers. Following the 1989 fall of Communism, the firm became WSK PZL – Rzeszów.
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 1950
Country of Origin
United States of America
Type
PROPULSION-Reciprocating & Rotary
Manufacturer
Aircooled Motors Corporation (Franklin)
Physical Description
Type: Reciprocating, 6 cylinders, Horizontally opposed, Air-cooled
Power rating: 157 kW (210 hp) at 3,200 rpm
Displacement: 5.5 L (335 cu in.)
Bore and Stroke: 114 mm (4.50 in.) x 89 mm (3.50 in.)
Weight: 130.6 kg (288 lb)
Dimensions
Height 65.4 cm (25.75 in.), Width 78.4 cm (30.88 in.), Depth 91.4 cm (36 in.)
Materials
Steel
Paint
Aluminum
Rubber
Cadmium Plating
Copper Alloy
Plastic
Inventory Number
A19870202000
Credit Line
Transferred from the U.S. Marine Corps, Marine Corps Air-Ground Museum and Museums Branch Activities
Data Source
National Air and Space Museum
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