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Aviation History
1948
1948 - 1541.PDF
SEPTEMBER I6TH, 1948 FLIGHT 351 One might be misled by this Nene, cut away to show its one moving unit, into thinking that it is quite a simple matter to produce 5,000 Ib thrust. THE S.B.A.C. DISPLAY . . edge of the wing for thermal anti-icing. The tapping of one per cent of the gas flow results, roughly speaking, in the loss of one per cent thrust. It is not yet certain whether the long 106 jet pipes will be of round or oval section. It was a disappointment that one more S.B.A.C. Display should pass without a Python being seen in the air. How- ever, it is known that more than one trial installation has been completed and flight testing should commence this month. Small-scale production of this high-powered unit has begun. A good idea of the cowling line with air intake behind the spinner could be gained from the handsome static Python complete with contraprop. Another most important airscrew-turbine making its first appearance in public was the Bristol Proteus. Its modest station, tucked away behind other units packed on to the stand, belied the vital part it is to play in powering the Brabazon and S.R.45S. No doubt on this occasion other Bristol engines which are available for sale were considered more appropriate to the front line of the " shop window." Certainly the civil Hercules 763s, sectioned and as a power plant, and the larger Centaur us r8, as fitted to the Sea Fury, made an impressive display. It did not take a tech- nician to recognize that the stripped-down components of the Bristol Theseus, which completed the 500-hour test run, were in extremely good condition. As an example of excellent design work the sectioned Derwent turbine unit would be difficult to better. That a power section so neat and compact can develop approxi- mately 7,750 s.h.p. to drive the compressor is almost incon- ceivable. Accompanying it were a fine- sectioned Rolls-Royce Nene and a Derwent, also a two-speed two-stage Merlin 620 Series engine as installed in Tudors and Canadairs. Symbolic of the way in which turbojets are entering the civil field was the striking opened- up Ghost nacelle already referred to, which dominated the de Havilland engine display. The power unit proper is similar to that in the (Top right) Entirely new and completed just in time for display, the Cirrus Grenadier is a thoroughly up-to-date, supercharged, 300 h.p. six. Below it are two very different examples of self-contained power units, the upper one is the Napier Naiad 1,500 h.p. turboprop, the lower, a 145 h.p. v.p. Gipsy Major 10. (Right) A de Havilland Ghost "power egg " embodying the latest practices in thermal de-icing and partitioning of hot and cold sections. B 17
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