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Curtiss XNBS-4

American bomber prototype

Curtiss XNBS-4
Role	Biplane night bomber Type of aircraft
National origin	United States
Manufacturer	Curtiss Aeroplane and Motor Company
First flight	1924
Primary user	United States Army Air Corps
Number built	2
Developed from	Martin NBS-1

The Curtiss Model 36 XNBS-4 was a 1920s prototype biplane night bomber built by the Curtiss Aeroplane and Motor Company for the United States Army Air Corps.^[1]

The XNBS-4 was developed by Curtiss as an improvement on the Martin NBS-1. Two prototypes, AS68571 and AS68572, were built. The design did not enter production because it offered no significant improvement over the NBS-1.^[1]

Data from National Museum of the United States Air Force^[1] and Aerofiles^[2]

General characteristics

• Crew:4
• Length: 46 ft 6 in (14.17 m)
• Wingspan: 90 ft 2 in (27.48 m)
• Height: 15 ft 9 in (4.80 m)
• Airfoil: Curtiss C-72^[3]
• Gross weight: 13,795 lb (6,257 kg)
• Powerplant: 2 × Liberty L-12A V-12 water-cooled piston engines, 435 hp (324 kW) each

Performance

• Maximum speed: 100 mph (160 km/h, 87 kn) at sea level
• Cruise speed: 95 mph (153 km/h, 83 kn)
• Stall speed: 53 mph (85 km/h, 46 kn)
• Range: 620 mi (1,000 km, 540 nmi)
• Service ceiling: 13,000 ft (4,000 m)

Armament

• Guns: 5x 0.3 in (7.62 mm) machine-guns
• Bombs: 1,907 lb (865.0 kg)

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