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Aviation History
1949
1949 - 1431.PDF
XIAL f>RESSOR COMPRESSOR CLAMPING BOLT FRONT MOUNTING RING IMPELLER Of CENTRIFUGAL COMPRESSOR COMPRESSOR FRONT CASING STARTER MOTORS AIRSCREWDRIVE-SHAFT COUPLING REDUCTION-GEAR SUN WHEEL REDUCTION GtAR PLANETARY PINIONS STATIONARY GEAR REDUCTION-GEAR PLANET CAGE REDUCTION -GEAR CASING TORQUEMETER PISTON DIFFERENTIAL PUMP QUICK-RELEASE CONNECTION FOR SUMP DRAININGMAINACCESSORIES DRIVING GEAR COMPRESSOR DELIVERY DUCT ACCUMULATOR, FUEL CUT-OUT AND ACTUATOR OMBUSTION CHAMBER BURNER NOZZLE BURNER This special " Right" sectional drawing reveals the layout Of the Proteus, whkh differs radically from that of the earlier Theseus. By means of a rear intake and a reversal of flow after the centrifugal compressor, compactness and a reduced diameter art obtained. Representing the latest version to date, the drawing includes some details which may be altered in the future as development "mods'" are incorporated. To reduce the turbine speed to a value suitable for efficient airscrew operation a compound epicyclic gear is used. Alter- native ratios of II.I: i and 11.9: 1 are available. Torque is supplied to the sun wheel'and the first redaction is to the larger wheels of the four planetary pinions. The smaller wheels of the pinions engage a " fixed " ring gear providing the second reduction and causing the planetary axes to rotate around the sun wheel. To the cage carrying the planetary pinions is flanged the airscrew shaft and the com- plete assembly is mounted in a roller and a ball bearing at rear and front respectively. The so-called " fixed " gear is actually floating and the load on it is balanced by a torquemeter system of eight cylinders and pistons under oil pressure. By this means a continuous indication of turbine performance, and of the power supplied to the airscrew, is provided. Two starter motors, each arranged laterally and inclined at 50 deg to the vertical, drive a bevel gear and, through a dog clutch, a spur gear engaging a pinion splined on the forward end of the compressor shaft. On later versions only a single starter may be fitted. From the compressor pinion through spur and bevel trains are driven the oil pumps, the fuel pump and a snare drive for any other accessory. One of the drives for the differential pump is also taken from this pinion; the other is from a gear wheel bolted to the rear of the planet cage of the reduction gear. The function of this component is to maintain the rotational Speed relationship of compressor and airscrew turbines; it is a reversible three-pinion pump with the centre pinion, taking its drive from the airscrew assembly, flanked by two idler pinions. The pump casing is mounted on a gear- wheel and rotated from the compressor. In principle, when compressor and airscrew turbines are running at their de- signed ratio (10: 10.7) relative rotation of casing and pinions is nil. Should the ratio deviate from the correct value, relative rotation will occur in one or the other direc- tion. If the airscrew-turbine speed is too high the pump delivers oil to one side of the hydraulic valve controlling airscrew blade pitch and coarsens pitch until the ratioits restored. Should the airscrew-turbine speed be too low the DIMENSIONS AND DATA Length (j« pipe omicted) ^ I I3.35inOverall ditmeter •„. 3g.5in Weight (bare) 2.9001bAirscrew rotation L.H. Tractor Airscrew shaft S.B.A-C. No. 6, standardReduction-gear ratio 0.09 : I or 0.084 : I Compressor turbine ... ... 10,000 r.p.m.Airscrew turbine 10,700 r.p.m. Output (sea level, static) ... ... 3.200 s.h.p.+800lb thrustOutput (35,000ft, 3S0 m.p.h.) 1,260 i.h.p. + 5601b thrust Fuel consumption (sea level, static) 0.688lb/s.h.p./hrFuel consumption (35,000ft, 350 m.p.h., airscrew efficiency 80 per cent) ... ... O.SIOIb/equiv h.p./hr
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