| Wright's
            last single-row radial was the R-1300 Cyclone 7, essentially
            one row of a R-2600.  Designed in
            1942, the earliest flight I can find is in 1949 powering the XT-28A.
             Production was licensed first to Kaiser-Frazer,
            then to Lycoming.  | 
           | 
          
            
                | 7 cylinder, air-cooled, radial engine |  
                | displacement: 1,302 cubic inches (21.3 liters) |  
                | bore x stroke: 6.125 x 6.3125 inches |  
             
           |