In support of an official event 

The Museum will be closed Sunday, May 25
In addition, the Fourth Hangar will be closed Saturday, May 24

Guided tours of the 4th building, normally scheduled at 3:00 p.m. daily, are canceled through May 28.

Effective immediately, the William E. Boeing Presidential Gallery will have limited guest access due to scheduled event preparations. The only accessible exhibits during this time include: Douglas VC-54 Sacred Cow, Flying the President Exhibit, USAF Established Artifact. We anticipate full gallery access will resume by June 5, 2025.

Wright R-3350-23 Duplex-Cyclone

The Wright R-3350 Duplex-Cyclone was one of the most powerful radial aircraft engines produced by the United States. Based on the earlier Wright Cyclone engines, the R-3350 first ran in May 1937, and its first major military use was to power the Boeing B-29.

Air-cooled with eighteen cylinders arranged in two rows, it has a displacement of 3,350 cubic inches. Horsepower ranged from 2,200 to over 3,500, depending on the model-the B-29 Bockscar for example used the R-3350-41 variant with 2,200 horsepower. Produced until the 1950s, thousands of these engines powered both military and commercial aircraft. The long list of aircraft using the R-3350 includes the C-119, C-121, and A-1 Skyraider.

This engine is displayed as it would have been when delivered to a maintenance unit. The additional parts would have come from the engine it was replacing.
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