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The Douglas Boston IV was the British version of the glass-nosed A-20J Havoc. While the USAAF had used a large number of the solid nosed A-20Gs, the RAF had not been interested in that variant. A gap had therefore developed between the last major delivery of the Boston III in the spring of 1943 and the arrival of 169 Boston IVs in June-July 1944. The Boston IV was virtually identical to the A-20J. Six squadrons operated the Boston IV. Nos.13 and 55 squadrons used them to replace the Martin Baltimore while Nos. 13, 18, 55, 88, 114 and 342 used them to supplement their existing Boston IIIs.
Engine: R-2600-23
Power: 1,600hp at takeoff, 1,675hp emergency, 1,400hp at 10,000ft
Crew: 3
Width: 61ft 4in
Length: 48ft 4in
Empty weight: 17,117lb
Normal take off weight: 23,748lb
Maximum takeoff weight: 27,000lb
Maximum speed: 317mph at 10,700ft
Cruise Speed: 257mph
Climb Rate: 8min 48sec to 10,000ft
Ceiling: 23,100ft
Range: 1,000 miles with 2,000lb bomb load, 2,100 ferry range
Fuselage Guns: Two fixed 0.50in Browning Machine Guns
Dorsal Turret: Two 0.50in Browning Machine Guns
Ventral Position: One 0.50in Browning Machine Gun
Normal Bomb Load: 2,000lb
Maximum Bomb Load: 4,000lb