Kemp (Grey Eagle) I-4 or D-4, In-line 4 Engine

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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.

Gift of Mrs. L. L. Walker Houston, TX.

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)

Country of Origin
United States of America

Manufacturer
Kemp Machine Works (Muncie, Indiana)

Date
1911-1912

Location
National Air and Space Museum in Washington, DC
Exhibition
Early Flight

Type
PROPULSION-Reciprocating & Rotary

Materials
Metal
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.)

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.

Gift of Mrs. L. L. Walker Houston, TX.

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)

Country of Origin
United States of America

Manufacturer
Kemp Machine Works (Muncie, Indiana)

Date
1911-1912

Location
National Air and Space Museum in Washington, DC
Exhibition
Early Flight

Type
PROPULSION-Reciprocating & Rotary

Materials
Metal
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.)

ID: A19660012000