Witteman-Lewis XNBL-1

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The Witteman-Lewis XNBL-1 "Barling Bomber" was an experimental long-range heavy bomber built for the United States Army Air Service in the early 1920s. Although unsuccessful as a bomber, it was an early attempt at creating a strategic bomber.

The XNBL-1(Experimental Night Bomber, Long Range) was designed by Walter Barling, who had previously designed the Tarrant Tabor, which was similar in concept but was destroyed in a fatal crash on its first flight in 1919. Like the Tabor, the Barling Bomber was a large six-engined triplane with a cigar-shaped fuselage. Unlike its predecessor, the XNBL-1 had a crew of seven and had all of its engines mounted level with the fuselage. The undercarriage had ten wheels, including two wheels towards the front of the aircraft(to prevent a nose-over on takeoff) and a tail skid. Components of the aircraft were assembled together to begin flight testing at Wilbur Wright Field. Final cost of the XNBL-1 project was $525,000, not including a $700,000 hangar to house the airplane.

Although capable of carrying a 5,000 lb(2,268 kg) bomb load, performance was disappointing. A fully-loaded XNBL-1 had a range of only about 170 miles (273.59 km) with a top speed of 96 mph. In contrast, the "short-range" Martin NBS-1 had a range of about 450 miles(724.20 km) and could carry a 2000 lb(907.18 kg) at the same speed. On a flight from Dayton, Ohio to Washington, DC, the Barling Bomber failed to fly over the Appalachian Mountains and had to turn around.

Although the XNBL-1 was not put into production, it had advanced features such as aluminum fuselage components, adjustable multiwheel undercarriage, separate compartments for crew, a flight engineer, electrical instruments, and advanced engine controls. The XNBL-1 was the largest aircraft in the United States until the Boeing XB-15 in 1935.