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Aviation History
1957
1957 - 1252.PDF
340 FLIGHT Rolls-Royce Dart 520 (RDa.7/1). Single-shaft turboprop. Two centrifugal com- pressors in series, seven canted combustion chambers and a three-stage turbine. Overall diameter, 38in; length, 98in; dry weight, about 1.250 Ib: mass flow approximately 22 Ib sec; pressure ratio, 5.75:1; maximum rating, 1,890 e.h.p. (1,700 s.h.p.) at 15,000 r.p.m.; typical cruising output at 20,000ft at 300 kt, 1,145 e.h.p. (1,075 s.h.p.) at 13,400 r.p.m. with s.f.c. of 0.6. Rolls-Royce Tyne (RTy.2 rating). Two-spool turboprop. Multi-stage low- pressure compressor, multi-stage high-pressure compressor, can-annular com- bustion system, single-stage high-pressure turbine and three-stage low-pressure turbine driving l-p. compressor and propeller. Overall diameter, 40.5in; overall length, 100.25in; dry weight, approximately 2,000 Ib with full equipment; mass flow, 46 Ib/sec; pressure ratio, 13:1; maximum rating, 5,315 e.h.p. (4,810 s.h.p.) at 15,250 l-p. r.p.m. The cruising specific fuel consumption will be about 0.4. British Aero Engines, 1957 former, depicted by a diagram, is on order as thepowerplant of a variety of modern jet transports including the Boeing 707, Douglas DC-8 andVickers-Armstrongs VC-10. The RCo.ll which has a rating of 17,250 lb is in production for theHandley Page Victor B.2 and is about to fly in an Avro Vulcan test-bed. R.B.I08 No details may yet be published ofthis neat lightweight turbojet which probably is descended from the Soar engine. Five R.B.108sare fitted to the Short S.C.I experimental aircraft, one being used for forward propulsion and theremainder (pointing downwards) for vertical lift. Dart One of the most long-lived and trouble-free engines in the world, the Dart has flown some three million hours in the Viscount and is in pro-duction for a wide variety of new and projected transport aircraft. In the French Breguet Alizeit has also found a military application. Most of the engines at present in service are ofthe 510-series of 1,742 e.h.p. The Dart illus- trated is now flying in the new Viscount 806/810and later engines such as the Dart 545 for the Viscount V.840 will have cooled blades and a newreduction gear capable of transmitting well over 2,000 s.h.p. Tyne Originally intended to be a turboprop rated at about 2,500 h.p. the Tyne now gives double this power and is probably the most com-pact and economical unit in its class anywhere in the world. Details of its interior may not yetbe disclosed owing to detailed similarity to mili- tary engines such as the Conway, yet superficialexamination shows that the design is of an exceed- ingly advanced nature. Prototypes have beenundergoing bench development since April 1955 and the first flight took place in June of last yearwith a single Tyne mounted in the nose of a Lincoln. An Ambassador test-bed powered by two Tyneswill shortly begin flying and the first V.951 Van- guard for which the Type is the standard engineis due to take the air in about twelve months' time. Other possible applications include ver-sions of the Beverley and Armstrong Whitworth Freightercoach and the DC-7T/DC-10. Laterversions of the engine give substantially more power than that quoted beneath the diagram. Other projects Although no details ofcurrent work may be given it is known that Rolls-Royce are active in the fields of rocketmotors and nuclear propulsion. In the latter field the company are working on the powerplant of anuclear submarine; large rocket motors are being designed in collaboration with North AmericanAviation, presumably for the British 2,000-mile ballistic weapon.
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