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The Model 4X engine was built by the Roberts Motor Company of Sandusky, Ohio. An important design objective was light weight, which was achieved through the extensive use of aluminum and magnesium alloys in the cylinders and crankcase, and a hollow crankshaft. Also like all Roberts engines it operated on a two-stroke cycle operation to reduce parts count. Between 1911 and 1912, Roberts engines were used by many noted exhibition pilots, and more Roberts engines were said to be built than by Hall-Scott and Curtiss combined during this period.

This engine artifact was manufactured about 1911 and powered a Curtiss-type, float-equipped aircraft (hydroplane) built by Harry H. Ford. Mr. Ford was a self-taught pilot and did most of his flying between 1912 and 1913 in the area of the Bridgeport, Connecticut harbor.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date 1911 Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Roberts Motor Company (Sandusky, Ohio)
 Physical Description Type: Reciprocating, in-line, 4 cylinders, water-cooled, two-stroke cycle Power rating: 37.3 kW (50 hp) at 1,400 rpm Displacement: 5.2 L (318 cu in.) Bore and Stroke: 114 mm (4.5 in.) x 127 mm (5 in.) Weight: 77 kg (170 lb) Dimensions 3-D: 102.9 × 61 × 63.5cm, 77.1kg (40 1/2 × 24 × 25 in., 170lb.)
Support: 114.3 × 58.4 × 39.4cm (45 in. × 23 in. × 15 1/2 in.)
 Materials Metal
 Inventory Number A19480187000 Credit Line Gift of Harry H. Ford. Data Source National Air and Space Museum Restrictions & Rights Open Access (CCO)
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