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Aviation History
1945
1945 - 1015.PDF
MAY 24TH, 1945 FLIGHT 559 HERCULES 10M l9OO°r BOO 1700 1600 1500 (400 1300 I2OO ICO <ooo 3OO 9OO JO 15 2O 25 3O 35 ALTITUDE FT. x IOOO = = = -r-EMERGENCY CRUISING CONTINUOUS ' AUTO. MIXTURE) .~ CIVIL ECONOMIC CRUISING; (gCCOMMBOEC MAX CONTIGUOUS V ALL OUT LEVEL (RICH AUTO MIXTURE) NORMAL CLIMB OP (RICH AUTO. MIXTURE) 15 2O 25 3O 35 4O ALTITUDE FT. X I0OO Curves of engine conditions for power output at varyingaltitudes. 80 §70 x §60 SsO Q- s: §40 s 2 30 14 15 16 17 IB 19 20 22 23 24 25 ?20 i !1 , - - - 1 1 ••- prrr ! —1 —— 1& 12 IK K> 9t BC 7C 6C 5C KP OO X> OO XI X) x> XJ X3 14 15 16 17 18 19 20 21 R.P.M.X 100 NOTE:- CONSUMPTIONS APPLY TO ANY ALTITUDE OR BOOST 22 23 24 25 Curves of economic fuel consumption for various powers. with individual outlet pipes from each cylinder which hasproved so successful in the latest bomber applications. An epicyclic reduction gear employing bevel wheels givesa ratio of 0.444 between crankshaft and airscrew shaft, the three planet wheels being carried on '' spoke '' stub armsoff the airscrew shaft and meshing with, and rotating against, the "sun" wheel (the foremost bevel) which issecured to the reduction gear casing. Input to the planets is through the rearmost bevel, whicfc is carried on the foreend of the crankshaft. The crankshaft is an interesting component of the three-section built-up type, with the front and rear sections secured to the crankpins of the centre section with manetonjoints, a form of construction pioneered by, and unique to, the Bristol Aeroplane Company. Big-end bearings on theHercules are of the type evolved by the company and used with such great success on the Pegasus and Perseus engines ;the bearings consist of white-metalled steel sleeves shrunk on to the crankpins, and superseded the earlier floatingtype bush some years ago. One of the main advantages of the special bearing is that periods between overhaulsare greatly extended. There are three main crankshaft bearings, housed in the rPOWER AT ALTITUDE POWER AT SEA LEVEL- ieoo 2000 ' MAXIMUM POWER TfAKE-OFF, SEA LEVEL " 5 MINUTE LIMIT. NORMAL CLIMb - RICH AUTO MIXTURE. EMERGENCY CRUISING - ONE HOUR LIMIT. CONTINUOUS CRUISING - ECON. AUTO. MIXTURE ALL - OUT LEVEL - RICH AUTO. MIXTURE. IO 2O ALTITUDE Ft X IOOO Performance curves for sea level and altitude powers at varying r.p.m. and boosts.
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