In 1945 two YB-35s were modified by replacing the four radial engines with counter rotating propellers with eight J35 turbojet engines.
Four vertical stabilizers were added and air dams to promote better airflow over the wing. The guns were also removed to reduce drag. The completed aircraft were designated YB-49.
The first flight of YB-49 was on October 21 1947. The second aircrafts first flight was on January 13, 1948.
the political climate and a stability problem during bomb runs would put an end to this bomber. Testing continued and on June 5, 1948 the second aircraft crashed, with a loss of all six crewmembers. On march 15,1950 during testing on a high speed taxi run the nose landing gear collapsed. The first YB-49 was destroyed. Not until The B-2 stealth bomber did the flying wing concept find a place with the USAF.
YB-49 All-Jet Flying Wing
Technical Notes
Armaments: Designed for bomb loads up to 16,000 lbs.
Engines: Eight Allison J35-A-5 axial flow turbojet engines with 4,000 lbs. of thrust
Maximum speed: 495 mph
Cruising speed: 420 mph
Range: 4,000 miles with 10,000 lbs. of bombs
Service ceiling:42,000 ft.
Span: 172 ft.
Length: 53 ft. 1 in.
Height: 15 ft. 2 in.
Weight: Approx. 213,5000 lbs.
Crew: Six ( pilot, copilot, flight engineer, radio operator, bombardier, gunner)
Serial numbers: 42-102367 and 42-102368
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I ran through my options, should I break apart the major assemblies and weight the nose, or cut holes in the wing and weight it. I chose the later feeling that the major seams were in great shape with very little seam repair I was afraid I would cause myself a bigger problems trying to reassemble them. So I cut holes in the lower part of forward wing on both sides of the flight deck and using 5 minute epoxy glued lead weights in the nose. 
moment myself. Dicovered that I had glued the cockpit panel to the over/sun panel skewed.
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