Boston III – A-20
Made by the Douglas firm and developed from their civil transport DC-5, the Boston is one of the best American types and in fact one of the best medium bombers in the world. France bought some just prior to the collapse, and we took over their orders and ordered some more.
There are three marks, the I has two 1,050hp PW Wasps, the II has two 1,200hp PW Wasps and the III has two 1,600hp Wright Cyclones. The Boston I was used by the RAF as a trainer and the II was used as a night fighter and called the Havoc I. The III is now used in large numbers on fighter escorted raids on France and the Low Countries and is also used extensively in the Middle East. They have done very good work, and with the Ventura have replaced the Blenheim in this country. The Mk.III is also used as a night fighter and is known as the Havoc II.
They were first officially mentioned in action in a raid on the Paris area in June, 1942. A rudimentary form of dual control is fitted and is operated by the gunner, the crew being unable to change positions. Most Bostons carry automatic cameras.Manufacturers : Douglas Aircraft Co. Inc. ( Santa Monica).
Type : American (now in service with the RAF) fast day bomber. The latest type is a development of the original DB-7.
Engine : Boston I (DB-7) – Two Twin Wasp of 1,150hp (radials). Boston II (DB-7A) – Two Twin Wasp of 1,200hp (radials). Boston III (DB-7B) – Two Wright double-row Cyclone of 1,600hp.
Speed : Boston I – Maximum, 315mph; cruising 250mph; Boston II – Maximum, 325mph; cruising 258mph; Boston III – Maximum, 330mph; cruising 260mph.
Range : 1,200 miles.
Ceiling : 30,000ft.
Armament : 2 or 4 fixed machine guns in nose; 1 free gun in dorsal position; 1 free gun in ventral position; Bomb load 2,000lbs.
Dimensions : Span 61ft 4in, length 47ft 3in, height 17ft 10in, wing area 464 sq ft.
Construction : Wings, metal framework, stressed skin covered. Tail unit, metal framework, metal covered. Fuselage, metal structure, stressed skin covered. Fully retractable tricycle undercarriage.
Distinguishing features : Shoulder-high twin-engined monoplane with simple tail unit and retractable tricycle undercarriage. Radial engines are underslung. Long pointed nose. Wings have straight leading edge and marked straight taper on trailing edge, beyond which the engine nacelles project. Fuselage has bellied appearance with upward sweep at the rear. Tailplane has dihedral from roots. Fin and rudder very large and bell-shaped.
Summary of recognition features : Wineglass wing and “tails-up”.
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