Boeing B-29 Superfortress Bockscar

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The Boeing B-29 Superfortress is a four-engine propeller-driven heavy bomber designed by Boeing and flown primarily by the United States during World War II and the Korean War. Named in allusion to its predecessor, the B-17 Flying Fortress, the Superfortress was designed for high-altitude strategic bombing but also excelled in low-altitude night incendiary bombing, and in dropping naval mines to blockade Japan. B-29s also dropped the atomic bombs on Hiroshima and Nagasaki, becoming the only aircraft to ever use nuclear weaponry in combat. 

General characteristics 
Crew: 11 (Pilot, Co-pilot, Bombardier, Flight Engineer, Navigator, Radio Operator, Radar Observer, Right Gunner, Left Gunner, Central Fire Control, Tail Gunner)
Length: 99 ft 0 in (30.18 m)
Wingspan: 141 ft 3 in (43.05 m)
Height: 27 ft 9 in (8.46 m)
Frontal area: 41.16 sq ft (3.824 m2)
Powerplant: 4 × Wright R-3350-23 Duplex-Cyclone 18-cylinder air-cooled turbosupercharged radial piston engines, 2,200 hp (1,600 kW) each
Propellers: 4-bladed constant-speed fully-feathering propellers, 16 ft 7 in (5.05 m) diameter Performance Maximum speed: 357 mph (575 km/h, 310 kn)
Cruise speed: 220 mph (350 km/h, 190 kn)

Armament 
Guns: 8 or 10× .50 in (12.7 mm) Browning M2/ANs in remote-controlled turrets. (omitted from Silverplate B-29s) 2× .50 BMG and 1× 20 mm M2 cannon in tail position (the cannon was later removed)
 Bombs: [89] 5,000 lb (2,300 kg) over 1,600 mi (2,600 km; 1,400 nmi) radius at high altitude 12,000 lb (5,400 kg) over 1,600 mi (2,600 km; 1,400 nmi) radius at medium altitude 20,000 lb (9,100 kg) maximum over short distances at low altitude Could be modified to carry two 22,000 lb (10,000 kg) Grand Slam bombs externally. The Silverplate version delivered the first atomic bombs.