The Vickers Viscount was a medium-range airliner driven by four turboprop engines. The type was designed and manufactured in Britain from 1948 to 1963. Prototypes Type 630 First prototype, with short fuselage (74 ft 6 in (22.71 m), accommodating 32 passengers and powered by four 1,380 ehp (1,032 kW) Rolls-Royce Dart R.Da Mk 501 engines. Type 663 Second prototype, testbed for Rolls-Royce Tay turbojet. Type 640 Planned third prototype, powered by four Napier Naiad turboprops. Not built, with parts incorporated in Type 700 prototype. Viscount 700 Type 700 The first production version, 1,381 hp (1,030 kW) engines, 287 built, the "D" suffix was used for aircraft powered by the 1,576 hp (1,175 kW) Dart 510 engines. Type 701 Production aircraft for British European Airways (BEA), the same as the prototype 700 but as in all production aircraft the engines were moved 18 inches outboard to reduce cabin noise level. Originally fitted with Dart 505 engines but later changed to Dart 506s. Originally had a either 40 or 47 seats but this was changed in the 1960s to seat either 60 or 63 passengers, 27 built, first delivered in January 1953. Type 702 Production aircraft for British West Indian Airways (BWIA) with Dart 506 with 44 or 53 seats, four built, first delivered in June 1955. Type 703 Proposed 53-seat variant, not built. Type 707 Production aircraft for the first export customer Aer Lingus with Dart 505s (later Dart 506s) and 53 seats, four built, first delivered in March 1954. Type 708 Production aircraft for Air France with Dart 505s (later Dart 506s) and 49 seats, 12 built, first delivered in May 1953. Type 720 Production aircraft for Trans Australia Airlines (TAA) with Dart 505s (later Dart 506s) and 49 seats, 12 built, fitted with slipper tanks for an extra of fuel, seven built, first delivered in October 1955. Type 723 Production aircraft for the Indian Air Force with Dart 506s and a VIP interior, one built, delivered in December 1955. Type 724 Production aircraft for Trans-Canada Air Lines (TCA) of Canada with Dart 506s, included increased electrical power, new fuel system, and cold-weather operation provisions (ice-guard panels of fuselage and anti-skid brakes). Fitted with 44 or 48 seats, 15 built, first delivered in December 1954. Type 728 Production variant for Cyprus Airways and Aden Airways with Dart 506s, not built. Type 730 Production aircraft for Indian Air Force, same as