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

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:
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, Washington, DC
Exhibition
Early Flight

Type
PROPULSION-Reciprocating & Rotary

Dimensions
Length 76 cm (30 in.), 46 cm Height (18 in.), Width 30 cm (12 in.) (Approximate)

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:
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, Washington, DC
Exhibition
Early Flight

Type
PROPULSION-Reciprocating & Rotary

Dimensions
Length 76 cm (30 in.), 46 cm Height (18 in.), Width 30 cm (12 in.) (Approximate)

ID: A19660012000