| Experimental
                Aircraft | 
            
              | 
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              | In
                the broadest sense of the term, every airplane begins as an experimental 
              model.  Many are successfully flight
                tested, debugged and put into production. Except for the XP-59,
                this section includes airplanes that generally never went past
                the prototypes or into widespread production.  All are remarkable for the legend
                they left behind. .The aircraft in this section are historic.  For 
              contemporary Experimental Planes, 
              Click Here | 
            
              | Dornier Do-X - 
Enormous
12 engine seaplane that flew around the world | 
            
              | Spruce Goose - 
Howard
Hughes' enormous seaplane. | 
            
              | D-558 Skystreak 
      set a new world speed record 
of 640 mph in 1947  See notes below. | 
            
              | Bell X-2 -  
      First airplane to fly three 
time speed of sound. | 
            
              | Douglas X-3   
      - used to test new materials 
and supersonic maneuvers | 
            
              | Northrop X-4 Bantam
 
      - tested semi-tailless 
aircraft at high subsonic speeds | 
            
              | Bell X-5  
      - First airplane to vary the 
sweepback of its wings in flight. | 
            
              | Northrop XB-49 Flying
Wing 
 - 
Design
was resurrected 40 years later to become the B-2 Stealth Bomber. | 
            
              | Grumann XP-59A Airacomet -
                America's first jet-powered airplane | 
            
              | North American XB-70
                Valkyrie - USAF
                Mach 3 Bomber. | 
            
              | Convair XF-92  -  
      First jet aircraft to fly 
              using the radical delta-wing configuration | 
            
              | North American X-15 - 
              Used to explore the edge of space.  Provided data for space 
              shuttle design. | 
            
              | In
                our Milestones of Flights Collection, see | 
            
              | X-1
                - First Airplane to break the sound barrier. | 
            
              | Douglas D-558-2 - First plane 
              to fly twice the speed of sound | 
            
              | For 
              contemporary Experimental Planes, 
              Click Here. |