原来以为蚊式就够厉害的了，最近在公众号里看到了XB42的介绍，又搜了一下，觉得这玩意简直逆天了，凭借两台1300hp级别的艾利逊，就能达到8000磅载弹量（两倍于蚊子），2900公里航程，410英里（660公里）极速！真是就怕货比货啊
，难道推进式螺旋桨的效率这么高吗？还是有其他原因？
General characteristics
Crew: Three (pilot, copilot/gunner and bombardier)
Length: 53 ft 8 in (16.36 m)
Wingspan: 70 ft 6 in (21.49 m)
Height: 18 ft 10 in (5.74 m)
Wing area: 555 ft² (51.6 m²)
Empty weight: 20,888 lb (9,475 kg)
Max. takeoff weight: 35,702 lb (16,194 kg)
Powerplant: 2 × Allison V-1710-125 V12 engines, 1,325 hp (988 kW each) each
Performance
Maximum speed: 410 mph (357 knots, 660 km/h) at 23,440 ft (7,145 m)
Cruise speed: 312 mph
Range: 1,800 mi (1,565 nmi, 2,895 km)
Ferry range: 5,400 mi(4,696 nmi (8,690 km))
Service ceiling: 29,400 ft (8,960 m)
Armament
Guns: 6 × .50 in (12.7 mm) machine guns, two twin rear-firing turrets and two fixed forward-firing[9]
Bombs: 8,000 lb (3,629 kg)
，难道推进式螺旋桨的效率这么高吗？还是有其他原因？General characteristics
Crew: Three (pilot, copilot/gunner and bombardier)
Length: 53 ft 8 in (16.36 m)
Wingspan: 70 ft 6 in (21.49 m)
Height: 18 ft 10 in (5.74 m)
Wing area: 555 ft² (51.6 m²)
Empty weight: 20,888 lb (9,475 kg)
Max. takeoff weight: 35,702 lb (16,194 kg)
Powerplant: 2 × Allison V-1710-125 V12 engines, 1,325 hp (988 kW each) each
Performance
Maximum speed: 410 mph (357 knots, 660 km/h) at 23,440 ft (7,145 m)
Cruise speed: 312 mph
Range: 1,800 mi (1,565 nmi, 2,895 km)
Ferry range: 5,400 mi(4,696 nmi (8,690 km))
Service ceiling: 29,400 ft (8,960 m)
Armament
Guns: 6 × .50 in (12.7 mm) machine guns, two twin rear-firing turrets and two fixed forward-firing[9]
Bombs: 8,000 lb (3,629 kg)
在手册里它的5333mile航程指标是2100hp的1710-10
