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Aviation History
1947
1947 - 1490.PDF
FLIGHT SEPTEMBER 4TH, BRITISH POWER UNITS Principal Data of Current Aircraft Gas Turbines and Piston Engines DURING the past year several new power unitsand new marks of existing ones have been in-troduced, and, in addition, development workhas led to increases in power ratings. On these pages the principal data for all current British engines have been tabulated for reference, and in our next issue illustrations and brief descriptions of many of these power units as displayed at Radlett will be given. Because of the many special military and civil duties for which power units are designed it is difficult to decide what conditions for power and consumption figures con- stitute the fairest and most useful basis for comparison. The question of metric measures also arises. It has been decided to give in these tables consumption figures in gallons per hour for the makers' recommended econo- mical cruising conditions. This, it is felt, will provide the potential operator with working figures, and the units will also have an immediate meaning for foreign readers and visitors to Radlett. Not only has development of gas turbines proceeded satisfactorily but several very important type tests have been completed. Special mention of the Bristol Theseus must be made as this unit became, on January 28th, the first airscrew turbine in the world to hold a type test certificate, and subsequently the first power plant of the type to be put into production. The particular test en- tailed 156 hours' continuous running without heat ex- changer. Metropolitan-Vickers F.2/4 A units also achieved a new high official power rating, and two examples will power the unique prototype S.R. Ai fighter which is to make its first public demonstration at ^adlett. The F.2/4 A has been named the Beryl and other Metrovick turbines are in future to be named after precious stones. Thrust augmentation is a subject which is occupying the minds of many of our gas turbine designers, and work is not restricted only to the ducted and open fans of the Metrovick F.3 and F.5 As the large piston engines become less important for military installation the manufacturers naturally give more attention to the development of civil versions. Two examples are the Bristol Centaurus 630., which is in pro duction for the Ambassador and which corresponds to the previous military 130, and the civil version of the Rolls-Royce Griffon 57 which is shortly to become avail- able. New Gas Tiirbines The names of several new units have been released for which power figures are still awaited. These are the Armstrong Siddeley Mamba 2 ; the Bristol Pheobus I development engine,, Proteus I (a 3,500 h.p. class air- screw turbine) and small Janus I.; the de Havilland H.3; and the Rolls-Royce Dart. The Dart, small airscrew tur- bine, is, of course, well advanced, and is expected to complete its type test and to fly in a matter of weeks. New engines included in the table, for which figures have been given, are the de Havillaiid Goblin 3, a high- rated unit installed in the Company's tailless 108, the de Havilland Ghost, and the Napier Naiad. There is no further news of the development work of the National Gas Turbine Establishment (Power Jets) or, in particular, of the progress with their very small turbine in the 250 h.p. class. Unfortunately, the development of the very promising Fedden airscrew turbine, the Cotswold, described in de- tail in Flight dated June 26th, 1947, has had to be aban- doned, and the future of the company's interesting light aircraft piston engines is also in the balance. GAS TURBINES (Compiled by "Flight." Copyright) - Maker's Name and Engine Type Armstrong Siddeley : Python Mamba Bristol :Theseus De Havilland :Goblin 2 Goblin 3 Ghost Metropolitan- Vkkers :Metroviok Beryl F.2/4 A Metrovick F.3 Mecrovidc F.5 Napier: Naiad Rolls-Royce : Derwent V Nene 1 NenetiClyde Type ofCom- pressor IA (I A IA, IC !C IC IC IA IA IA IA IC IC IC IA, IC No. of Com-bustion Cham-bers II 6 8 16 16 10 • 1 Ann. 1 Ann. 1 Ann. 5 9 9 9 9 Max. (Sea Thrust ">• 1,150 320 500 3,000 3,300 5,000 3,850 4,600 4,710 241 3,600 4.500 5,0001,225 Power Rating Level Static) Shaft h.p. 3,670 1,010 1,950 — — — — — — 1,500 — — 3,020 •"""•—^^~ r.p.m. 8,000 14.500 8,200 10,200 10,750 H),000 7,750 7,390 7,700 18,250 14.700 12,000 I2.3CO6.000 Recommended Thrust tb. 950 265 330 1,850 2,240 2,82-5 3,400 3,900 2,300 268 2,*75 3r500 4,000 — Power Shaft h.p. 2,720 747 1.180 — — 902 — Economi cat Cruisirw (R.E.C.P.) r.p.m. 7..603 13,750 8,200 8,700 9,500 8,500 7,400 , — l7rQC0 13,600 11.200 11,600 — Speed (m.p.h.) and Ht. S.L. Static S.L. Static 300 -at 20,000 S.L. Static S.L. Static S.L. Static S.L. Static S.L. Static 400 at 20,000 SJ-. Statif S.L. Static S.L. Static S.L. Static Fuel Con- sumption (R.E.C.P.) G.P.H. 290 79 99 308 380 440 3 re 247 96.2 34 r- 445 512 Diam. Length in. 48 & 96 27 & 563 48 & 106 49.85 & 100.5 49.85 & 100.5 53 & 115.5 37.25 & 129 46 & 140 37.25 & 146:5 28 & 102 43 & 83.1 49.5 & 96.B 49.5 S 96.846.72 & 1213. Dry Weight Ib. 3,150 750 7,310 1,550 1,573 2,011 1,550 2,300 2,200 1,095 1,280 1,640 ' 1,6402,800 Notes. Weight with intakes but not airscrews.Length from rear face of airscrew hub to rear face o1 turbine housing. Weight inctudes in- takes, heat exchan- ger and mounting. Weight including tai pipe, nozzle, etc. excluding a/e. aux- iliaries. Ducted fan. Open an thrust aug- mentor. Weight less airscrew Weight less airscrew
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