Roberts 4X In-line 4 Engine

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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.


10/23/2018 1:05


Eric Long

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Smithsonian's National Air and Space Museum


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