1927 Boeing Model 40-B2 Biplane on Exhibit in Henry Ford Museum, June 2007

Boeing's Model 40-B2 airplane used an air-cooled radial engine. Carrying capacity that would have been spent on a radiator and water could instead be used for mail or passengers. When Heroes of the Sky opened at The Henry Ford in 2003, the Model 40-B2 represented designer and manufacturer William E. Boeing in the exhibit's "Entrepreneurs" section.