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Aviation History
1918
1918 - 1375.PDF
Whereas the gear box in the four-engined giant, of which notes have already been given in this report, is of a somewhat crude type employing external driving shafts between the (-•••- DECEMBER 5, 1918 In each case the gear reduction is 21-41. Plain spur pinions are used having a pitch of 22 mm. and a width across the teeth of 75 mm. The diameter of the gear box and the engine, in the five-engined machine the smaller of the driving pinions is 162-5 mm., and that of_the gear-box design is considerably improved. The casing con- larger pinion 282 mm. . ^ ''•• • ,-• •>» H H 0 H IH IS H 0 Fig. 72.—Oil radiator and gear pump of five- engined giant. H E H 0 0 0 0 13 m m a - H sists, as shown in photograph No. 67, of a massive aluminium casting provided with four feet which are bolted to the engine bearers. Two kinds of gear boxes are employed. These differ only in over-all dimensions and the length of the propeller shaft. The larger type is used for the pusher screw in order to obviate the necessity of cutting a slice out of the trailing edge of the main planes. All the gear boxes were very badly damaged except that which is shown in Fig. 67. This is the longer type, but it would appear that the shorter design is very similar in appear- ance. The larger pinion is as shown in Fig. y$, considerably dished* but the web is not lightened by any perforations. The over-all dimensions of the gear box, as represented in Fig. 67,. is as follows :— Length, 1,025 mm. ; breadth, 675 mm. ; height, 53s mm. The driving pinion runs on two large diameter roller bearings- carried in gunmetal housings supported in the inner end of the gear box. This part is split vertically, and united by the usual transverse bolts, whilst the conical- shaped portion of the box is solid. The usual oil-thrower rings of helical type are fitted. At its outer end the pinion shaft terminates in a ring o Some more details of five-engined giant-—73. Pusher screw and driven pinion. 74. Tractor screw andpinion. 75. Oil filter of gear box. 76. Engine control levers. 1376
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