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Aviation History
1956
1956 - 1525.PDF
SINGLE-STAGE HIGH- PRESSURE. THREE-STAGE LOW-PRESSURE TURBINE 26 October 1956 681RVE-STAGE HtGH-PRESSURE COMPRESSOR BRISTOL ORION Two-spool, power-limited turboprop, with single high-pressure turbine stage driving five-stage high-pressure compressor and three-stage low- pressure turbine driving seven-stage low-pressure compressor and pro- peller. Overall diameter, 41.8m at intake flange; overall length, 112.3in from cone fitting to exhaust flange; equipped dry weight. 3,150 Ib; mass flow, 82 Ib/sec; pressure ratio, 101; take-off rating, i.s.a., 4.400s.h.p. plus 1,9501b thrust (5,150 e.h.p.) at 10,000 h-p. and 9,020 l-p. r.p.m. respectively, with turbine-inlet tem- perature of 1,035 deg K. FUEL CONTROL iYSTEM (REMOVED FROM LOW-PRESSURE COMPRESSOR CASE) 65 Propeller control unit. 66 Reduction-gear oil pump. 67 Reduction-gear scavenge ftlter. 68 Reduction-gear oil-pressure trans- mitter, 69 Reduction-gear oil-pressure warn- ing light switch. 70 Propeller-control oil filter. 71 Propeller oil via (1). 72 Oil gallery to reduction-gear via propeller shaft. 73 Oil supply to propeller control unit from feathering pump. 74 Oil to propeller via (71). 75 Feathering oil filter. 76 Propeller-control actuator. 77 Oil-cooler outlet cross-feed. 78 Light-alloy oil cooler (air-cooled). 79 Oil to cooler inlet. 80 Low-pressure-shaft rear-bearing oil. 81 High-pressure-shaft rear-bearing oil (inner, supply; outer, return). 82 Quill-shaft from gears (44) driving oil and fuel pumps. 83 Main fuel pump (swash-plate type). 84 Main delivery from fuel pump tc control system. 85 Fuel-pump servo pressure. 86 Fuel-pump priming air vent. 87 Throttle control valve. 88 Combined barometric-pressure con- trol, shut-off cock and torque limiter. 89 Metered fuel delivery to burners.90 Dual fuel gallery. 91 Inner fuel gallery. 92 Outer fuel gallery. 93 Low-pressure fuel supply to filter, then to pump. 94 Low-pressure fuel filter. 95 Low-pressure fuel delivery to pump. 96 Starting fuel pump 97 Shut-off-cock actuator. 98 Return to pump suction. 99 Air-fuel-ratio control. • V 100 High-pressure compressor de- livery air pressure to A.F.R.C. (99). 101 Ram-air pressure to B»P.C, (88). 102 Torquemeter pressure to torque- li miter. 103 Throttle actuator (Ultra). 104 Mouncing. 105 Oil tank (capacity, engine oil 84 gal, feathering oil 2£ gal). 106 Oil tank filler. 107 Tank contents transmitter. 108 High-pressure-shaft tachometer transmitter (l-p transmitter on front bottom case). 109 Starter motor (24 or 110 V). 110 Alternator (50 kVA). 111 Alternator cooling-air entry. 112 Alternator cooling-air discharge. 113 Alternator support point (two). 114 Centrifugal vent (oil tank and all wheel-cases). 115 Cer.trifugai-oil return holes. 116 Casing flexible mounts. 117 Dynamic engine mountings, ram- air cooled. 118 Ram-air to cool (117). 119 Cooling-air discharge.
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