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Aviation History
1948
1948 - 0039.PDF
JANUARY 8TH, 1948 FLIGHT 33 Latest Bristol Piston Engines panels hinge, and are fitted with quick-release toggle fasteners and folding support struts. •• t ••, ,-- «' Heresies-760 Series v In common with the engines just described, the Hercules 760s have redesigned power- sections which permit an increase of about 20 per cent in^he power figure for take- off. Their principal difference is the fitting of two-speed superchargers embodying many of the well-proved design features of those on current military units, but also having certain improvements in mechanical construction. The fitted with Hobson-R.A.E. master-control bulk fuel injectors. Centaurus 630 Series The first civil Centaurus power plants which embody the Mk. 630 or 631 18-cylinder*- air-cooled engine have been prepared for civil aircraft -operating at medium altitudes and requiring high take-ofi power. Differences between these units and the military versions from which they have been developed are chiefly concerned with simplification and ease of servicing. The supercharger is of the single- speed type, and, like the Hercules, the Centaurus has Hobson-R.A.E fuel injection. This is of a new simplified type with self-contained fuel pump. The distributors and 10 15 2O ALTITUDE FT.MDOO to is 20 ALTITUDE FT. X 1DOO Performance curves for Hercules series 760 and 761. Take-off (5 minutes limit) —. — ; Max. emergency power .— ; Max. continuous power ; Max. continuous power lean mixture) . MAX EMERGENCY POWER MAX CONT POWER — - MAX COM! POWER ("LEAN MIXTURE) IO 15 2O ALTITUDE FT. * 1DOO 12OO UOO O74 LB /B.H.P./HR Performance curves for the 630 and 631 series of Bristol Centaurus engines. B.RP)O74/O7S LB/B.H P/Hfi MIXTURE.) •5BHP):-0*2/o*7LB /BHP/HB RICH MIXTURE) MOO ISOO 16OO 17OO 1BOO9O0 iOOO 11OO VOO BH P. 5OO . J.H.P):-0-81LB/B.H.R/HR URE) „.;- 5 B,H.R)-O7OLB/BAP/HR URE) ' •(,200 TOO Hercules fuel consumption curves for the 760 and 761 series. supercharger drive is of the epicyclic spur-gear type, and the earlier rotating-piston clutches have been replaced with oil-operated pistons of the non-rotating type. As these new clutches are not susceptible to sludging there is no longer need to fit oil centrifuges. These two-speed engines are intended for aircraft cruising at high altitude, and it was therefore thought wise to modify the auxiliary drive arrangements and to increase the capa- city to 150 h.p., thus permitting the inclusion of a cabin supercharger on the auxiliary gear box. Like the 750 series, the 760s also have provision for reversible-pitch braking airscrews. The various numbers in the series indicate the type of fuel on which the unit is rated, and the fitting or otherwise of a torquemeter. All civil Hercules engines are Fuel consumption curves for the 610 and 631 series of Centaurus '.-•'•-• •?& - '. .- engines. \ -^,:-; " i ••*- , high-tension leads in the ignition system are mounted at the front of the engine where they have cool working conditions and are easily accessible. A • modification to the reduction gear unit, though not to the gearing itself, makes provision for a reversible-pitch braking airscrew, and the 631, in keeping with the series number-'system, carries a torquemeter. In the .Centaurus power plant air for the engine intakes and for oil and generator cooling is drawn from inside the cowling. A selector switch in the pilot's cockpit enables him to select either cold air, hot air, or clean air as desired, and the system is protected by valves against a backfire. The exhaust pipes are taken to twin collecting manifolds mounted at the rear, of the engine and exhausting over the top of the power pranf. In addition to their primary func- tion the manifolds aid in silencing the engine. v» BOBBINGT WO 6^A-F- bob-sleigh teams which left for Switzerland on January 1st took with them sleighs built to a "secret list'' design built by an aircraft manufacturer, designed to travel at 80-90 m.p.h. The captain of both teams, one of which will represent Great Britain in the Olympic Games, is G/C. R. W. P. Collings, D.S.O., A.F.C., and the vice-captain is W/C. W. E. Coles, D.S.O., D.F.C., A.F.C. The teams are travelling by jeep, accompanied by the larger of the two sleighs on a trailer.
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