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The Kemp Machine Works of Muncie, Indiana built several types of air-cooled engines for airplanes, motorcycles, ice boats, and air-drives for boats. Due to its simple design and quantity production, this engine sold for approximately one half the price of its water-cooled competitors, and was lighter, more streamlined, and trouble-free than most of them.

Early models such as this one had concentric valves, which presented a large valve area, but a complicated design. Later models were equipped with conventional valves. All of the 2-, 4-, and 6-cylinder models had automatic intake valves.

A Kemp Model D-4 powered Walter Ralston's 1912 biplane.

 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 1911-1912 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Kemp Machine Works (Muncie, Indiana)
 Physical Description Type: Reciprocating, in-line, 4 cylinders; air-cooled, concentric valves; automatic inlet valve Power rating: 26 kW (35 hp) at 1,150 rpm Displacement: 4.18 L (255.36 cu in.) Bore and Stroke: 108 mm (4.25 in.) x 108 mm (4.25 in.) Weight: 82.2 kg (181 lb) Dimensions 3-D: 76 × 30 × 46cm (29 15/16 × 11 13/16 × 18 1/8 in.)
Support: 72.4 × 73.7 × 47cm (28 1/2 in. × 29 in. × 18 1/2 in.)
 Materials Metal
 Inventory Number A19660012000 Credit Line Gift of Mrs. L. L. Walker Houston, TX. Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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