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
Approximate Dimensions 30 x 18 x 12 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:
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
Approximate Dimensions 30 x 18 x 12 in.

ID: A19660012000