Roberts 4X, In-line 4 Engine Valve

Valve with brass knob on side of 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. This engine was manufactured in 1911 and powered a Curtiss-type, float-equipped aircraft (hydroplane) built by Harry H. Ford.

Created:

10/23/2018

Photographer:

Eric Long

ID #:

A19480187000-NASM2018-10847

Source:

Smithsonian's National Air and Space Museum

Copyright/Owner:

Smithsonian Institution

Rights Usage:

CC0 (Open Access)

Rights Status:

No Known Copyright or Other Restrictions

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