The Model 6X engine was built by the Roberts Motor Company of Sandusky, Ohio. An important design objective of this engine was light weight which was achieved through the extensive use of aluminum and magnesium alloys in the cylinders and crankcase, a hollow crankshaft, and two-stroke cycle operation (to reduce parts count). Between 1911 and 1912, Roberts engines were used by many noted exhibition pilots, and more engines were said to be built than by Hall-Scott and Curtiss combined.
This 75 kw (100 shp) Roberts 6X engine originally powered Herman Ecker's flying boat of 1912 , and it was donated by Mr. Ecker. The engine is installed in the Ecker flying boat (NASM No. 001313/Catalog No. A19620099000).
Gift of Herman A. Ecker.
Date: ca. 1911
Country of Origin: United States of America
Type: In-line, 6 cylinders, water-cooled, two-stroke cycle
Power rating: 75 KW (100 hp) at 1,200 rpm
Displacement: 7.8 L (477 cu in)
Bore and Stroke: 127 mm (5 in) x 127 mm (5 in)
Weight: 110 kg (243 lb)
Condition: On stand