The first YB-29 was converted to XB-39 Spirit of Lincoln
The first YB-29 was converted to XB-39, Spirit of Lincoln, to flight test the Allison V-3420 liquid-cooled engine
Picture No
10838583
Media ID
48040553
Size
4000px x 1538px
(526KB)
Credit
© The Royal Aeronautical Society (National Aerospace Library) / Mary Evans Picture Library
Source
Photograph from The Royal Aeronautical Society Archive
