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Aviation History
1947
1947 - 1520.PDF
270 FLIGHT SEPTEMBER IITH, 1947 British Power Units De Havilland Gipsy MajorN O light aircraft engine can better the world-wide reputation of the Gipsy Major which is noted in particular for its reliability, economy and exceptionally long inter-overhaul period. The latest production version, developed from the Mk. I, is the Major 10, while a new higher powered series, examples of which are the Major 30 and supercharged Major 50, have reached an advanced stage. Gipsy Major 18Cylinders ... ... Four in line Recommended cruising 115 b.h.p., 2,300 r.p.m. at5,000ft V Take-off 145 b.h.p.A f* AJCW? Weight 312 Ib-. s w ^^^T De Havilland Gipsy Queen OF the latest D.H. six-in-line enginesthe 30 series are normally aspirated and the 50s and 70s supercharged. The excellent record of the Rapide or Dominie design powered with two Gipsy Sixes is in itself a testimonial to these units. Series 50s are scheduled for the Merganser, and the geared higher- powered 70 Series are now doing very good work in the Doves and Marathons. Private owners, Service and Club pilots will be familiar with Gipsy Six perform- ance in Proctors, while the Queen 30, the direct development, is making its Service debut in the Prentice. The ad- dition of one to any of the numbers e.g., Queen 71, indicates an engine built to M.o.S. order. Series 30 and 70 engines are at present in production. GIPSY MAJOR IO Jameson AN interesting newcomer to the rangeof light aircraft engines, the flat four Jameson, has several novel design features. One of its particular claims to fame is the exceptionally low fuel consumptions achieved. On official tests at full throttle a consumption figure of 0.44 pt/b.h.p./hr has been recorded. Cylinders ... ... Four horizontally opposed Recommended cruising 90 b.h.p., 3,000 r.p.m. Take-off power ... ... 110 b.h.p. Weight 280 1b Napier Sabre VA THE twenty-four cylinder sleeve-valvedflat H Sabre series were at the end of the Avar the most powerful piston en- gines available for our fighters and they had built up an excellent reputation as the power unit of Typhoons in particu- lar. When vvater/methanol injection was adopted and the VA became the Mk. VII, the 3,000 h.p. figure was surpassed. A few Sabre VAs are still being produced for Tempest Vis in service in the East. A two-seat target towing adaptation of the Tempest V is to have Sabre IICs. Sabre VA Cylinders ... ... 24 H horizontal • Recommended cruising E90 b.h.p., 2,500 r.p.m. at 11,500 ft Take-off power 2,310 b.h.p. Weight 7.490 I Monaco "DLANS for the production of Monaco •*• engines include two flat-fours of 75 and 100 h.p. output respectively. De_ velopnrent of the 100 h.p. version is pro- gressing and several hundred hours running have been completed. Air tests will, it is expected, be made in an Auster. The manufacturers have had considerable experience with high-performance engines and in the design of this first aircraft engine special attention has been paid to the airframe designer's requirements and to accessibility. Cylinder! ... Four horizontally opposed Recommended cruising 85 b.h.p., 2,420 r.p.m. at Take-off power 100 b.h.p. Weight 230 Ib * Cylinders Recommended Take-off ... Weight Gipsy Queen 70 Six in line * cruising 265 b.h.p.,'2,400 r.p.m. aj\ 7,750ft *• --«** 345 b.h.p. GIPSY QUEEN Nuffield WHEN it was announced that theNuffield organization was to enter the light aero engine market with a 100 h.p. flat horizontally-opposed four design it was hoped that a company with such an enormous productive capacity and experience of large-scale manufac- ture might be able to produce for the first time a British light engine at a price comparable with American counter- parts. Whether or not a cost figure of 25s to 30s per horse power will ultimately be achieved remains to be seen, but de- velopment of the Nufneld is proceeding and there will be no shortage of suitable installations when this eagerly awaited power unit becomes available. Cylinders ... ... Four horizontally opposed Recommended cruising 70 b.h.p., 2,300 r.p.m. at S.L Take-off power 100 b.h.p. MONACO Rolls-Royce Merlin NO introduction is needed to the Mer-lin series of engine which achieved world-wide fame as the power unit of many of our most successful military aircraft. In the 'last few months the civil two-speed two-sta'ge power plants built round the latest Merlin 600 and 620 units have entered the North Atlan- tic service in Canadian D.C.4MS. Earlier Merlins are used on the South Atlantic routes in Lancastrians and on the Empire routes in Yorks, while recently both types have been used on the Azores Bermuda route on flight refuelling and Tudor IV experimental flights. Merlin MO, «20, 621 Cylinders Recommended Take-off ... Weight ... cruising 12 v M.S. 1,780 b.h.p., r.p.m. at 4,500ft F.S. 1,655 b.h.p., r.p.m. at 16.750 17 3,000 3,000 SABRE MERLIN
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