Collection Item Summary:
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.
Collection Item Long Description:
National Air and Space Museum
Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum
Gift of Mrs. L. L. Walker Houston, TX.
- 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.)
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Country of Origin
United States of America
- 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)
PROPULSION-Reciprocating & Rotary