High Gallery
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U. S.
Military Aircraft BOSTON Mk III Imperial War Museum |
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In 1936 Douglas designed its Model 7 as a light attack bomber, and after considerable refinement this flew in October 1938 as Model 7B private venture prototype with 1,100-hp Pratt & Whitney R-1830 radial. The type was maneuverable and fast, and soon elicited a French order for 100 somewhat revised DB-7s Only 60 were delivered, and 20 more passed to Great Britain. Further France orders covered 100 DB-7As and 481 DB-7Bs. Most of these served with the Royal Air Force as Havoc MK II night fighters and Boston Mk II bombers respectively. Later Boston were patterned on the A-20 aircraft for the US Army Air Force, and served mainly over North West Europe. |
TECHNICAL DATA
| Description | Specifications |
| Manufacturer: Douglas | Length: 47 ft. 3 in. |
| First Flight: October 1938 | Height: 18 ft. 1 in. |
| Model: Mk III | Wing Span: 61 ft. 4 in. |
| Crew: Three | Wing Area: 464.0 sq. ft. |
| Nickname: Boston | Empty Weight: 15,051 lb. |
| Basic Role: Light bomber. | Max. Weight: 21,580 lb. |
| Other
Versions: DB-7 R-1830, DB-7A Wright R-2600,
many passed to Great Britain as Havoc Mk Is. DB-7B revised systems and larger
vertical tail. Boston Mk I take over DB-s.
Boston Mk II take over DB-7s
converted to Havoc Mk I.
Boston Mk III (British DB-7Bs). Boston Mk IIIA lend lease A-20Cs with British equipment. Boston MK IV lend lease A-20Js with heavier fixed armament. Boston Mk V lend lease A-20Ks with more power. |
Armament: Seven 0.303-in 7.7-mm machine guns, up to 2,000 lb of bombs. |
| Principal User: Brazil, Canada, France, Great Britain, the Netherlands, South Africa, and USSR. |
Propulsion |
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Performance |
Power Plant: Wright R-2600-A5B Cyclone radial piston engines. |
| Range: 525 miles | Horsepower: 1,500-hp. |
| Max. Speed: 311 mph. | No. Of Engines: Two |
| Ceiling: 25,170 ft. | |
| Climb Rate: 2,000 ft per minute. |