# Douglas XB-19

The Douglas XB-19 was a four-engined, piston-driven heavy bomber produced by the Douglas Aircraft Company for the United States Army Air Forces (USAAF) during the early 1940s. The design was originally given the designation XBLR-2 (XBLR denoting "Experimental Bomber, Long Range"). It was the largest bomber built for the USAAF until 1946, with the Convair B-36 surpassing it in size.

## Design and development

The XB-19 project was intended to test flight characteristics and design techniques for giant bombers. Despite advances in technology that made the XB-19 obsolete before it was completed, the Army Air Corps believed the prototype would be useful for testing despite Douglas Aircraft wanting to cancel the expensive project. Its construction took so long that competition for the contracts to build the XB-35 and XB-36 occurred two months before its first flight.
The plane first flew on 27 June 1941, more than three years after the construction contract was awarded. It was based at Wright Field from January to November 1942. In 1943, the Wright R-3350 engines were replaced with liquid-cooled W24 Allison V-3420-11 by the aircraft division of Fisher Body in support of the XB-39 project. As part of the program, it was equipped with engine driven auxiliary powerplants. After completion of testing, the XB-19 was earmarked for conversion into a cargo aircraft, but modifications were not completed, and the aircraft flew for the last time on 17 August 1946. It was eventually scrapped at Tucson in June 1949.

## Surviving artifacts

The new U.S. Air Force had plans to save the XB-19 for eventual display, but in 1949 the Air Force did not have a program to save historic aircraft and the Air Force Museum had not yet been built. The XB-19 was therefore scrapped, but two of its enormous main tires were saved.

## Specifications (XB-19)

Data from McDonnell Douglas aircraft since 1920: Volume I
General characteristics
* Crew: 16 combat crew, with provision for 2 additional flight mechanics and six-man relief crew
* Length: 132 ft 4 in (40.34 m)
* Wingspan: 212 ft 0 in (64.62 m)
* Height: 42 ft 0 in (12.80 m)
* Wing area: 4,285 sq ft (398.1 m$^2$)
* Empty weight: 86,000 lb (39,009 kg)
* Gross weight: 140,000 lb (63,503 kg)
* Max takeoff weight: 162,000 lb (73,482 kg)
* Fuel capacity: 10,350 US gal (8,620 imp gal; 39,200 L) internals with optional auxiliary tanks of 824 US gal (686 imp gal; 3,120 L) capacity
* Powerplant: 4 × Wright R-3350-5 Duplex Cyclone 18-cylinder air-cooled radial piston engines, 2,000 hp (1,500 kW) each
* Propellers: 3-bladed constant-speed metal propellers, 17 ft 0 in (5.18 m) diameter
Performance
* Maximum speed: 224 mph (360 km/h, 195 kn) at 15,700 ft (4,800 m)
* Cruise speed: 135 mph (217 km/h, 117 kn)
* Range: 5,200 mi (8,400 km, 4,500 nmi)
* Ferry range: 7,710 mi (12,410 km, 6,700 nmi) with auxiliary tanks fitted
* Service ceiling: 23,000 ft (7,000 m)
* Rate of climb: 650 ft/min (3.3 m/s)
* Wing loading: 32.6 lb/sq ft (159 kg/m$^2$)
* Power/mass: 0.057 hp/lb (0.094 kW/kg)
Armament
* Guns:
   * 5 × 0.5 in (12.70 mm) M2 Browning machine guns
   * 6 × 0.3 in (7.62 mm) M1919 Browning machine guns
   * 2 × 37 mm (1.457 in) M4 autocannon
* Bombs: 18,700 lb (8,500 kg) internal; maximum bomb load of 37,100 lb (16,800 kg) including external racks with reduced fuel load