Roberts 4X, In-line 4 Engine

The Roberts 4-X engine is a 2-cycle, water-cooled rotary valve engine. Its construction features the lightweight magnesium alloys Aerolight and Magnalium, resulting in an especially good power-to-weight ratio. It is among the most reliable aeronautical engines available, and has powered some of the most notable aeroplanes of the day, including Benoit, Bleriot, and Curtiss types.

This particular example was used by Harry H. Ford of Bridgeport, Conn., in his 1912 Curtiss Hydroaeroplane. Ford has been a leading aviation pioneer in Connecticut.

Gift of Harry H. Ford.

Physical Description:
Weight: 77 kg (170 lb)

Country of Origin
United States of America

Manufacturer
Roberts Motor Company (Sandusky, Ohio)

Date
1911

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

Type
PROPULSION-Reciprocating & Rotary

Materials
Metal
Dimensions
Length 103 cm (40.5 in)., Width 61.0 cm (24.0 in)., Height 63.5 cm (25.0 in).

The Roberts 4-X engine is a 2-cycle, water-cooled rotary valve engine. Its construction features the lightweight magnesium alloys Aerolight and Magnalium, resulting in an especially good power-to-weight ratio. It is among the most reliable aeronautical engines available, and has powered some of the most notable aeroplanes of the day, including Benoit, Bleriot, and Curtiss types.

This particular example was used by Harry H. Ford of Bridgeport, Conn., in his 1912 Curtiss Hydroaeroplane. Ford has been a leading aviation pioneer in Connecticut.

Gift of Harry H. Ford.

Physical Description:
Weight: 77 kg (170 lb)

Country of Origin
United States of America

Manufacturer
Roberts Motor Company (Sandusky, Ohio)

Date
1911

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

Type
PROPULSION-Reciprocating & Rotary

Materials
Metal
Dimensions
Length 103 cm (40.5 in)., Width 61.0 cm (24.0 in)., Height 63.5 cm (25.0 in).

ID: A19480187000