American Aviation Historical Society

When Wright engineers began R-3350 development in January 1936 they 
incorporated as many of the established Cyclone
engine attributes as possible 
into the new engine following the design and construction details of their 
successful R-2600. The R-3350 was an air-cooled, duplex engine that had 
18 cylinders with two radial rings of nine
cylinders positioned around 
the crankshaft. (Author/Pima ASM)


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