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
Kemp Machine Works (Muncie, Indiana)
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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National Air and Space Museum Collection
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