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1904 Test Engine 
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 ever
used on an airplane, the Wrights built a third engine in 1904. It had 201 cu in like the
first, but with the mechanical improvements of the second. Used in the shop
as a test-bed for engine experiments, this third motor eventually achieved 25 hp, twice that of the first motor of
the same size. The motor was last run in 1937 at the Henry Ford Museum
for the dedication of the restored Wright Cycle Shop and Wright home in
Greenfield Village. In 1946 or 1947, Orville borrowed its crankshaft to
restore the engine of the 1905 Flyer III. This crankshaft was made new and
replaced in 2002. The restored third motor is now on display at the Engineer's Club in Dayton, Ohio.
References:
- Hobbs, 1971, pp 32-33.
- Hobbs, Leonard S. The Wright Brothers' Engines and Their design. Washington, D.C.:
Smithsonian Institution Press, 1971, pp 32-33.
[Submitted by Joe W. McDaniel]
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The 1904 test engine was never used on an airplane, but provided the Wrights
with valuable experience in engine design and building.
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