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Aviation History
1934
1934 - 1396.PDF
SUPPLEMENT TOFLIGHT JANUARY 25, 1934 THE AIRCRAFT ENGINEER surface. The " girth "' becomes flat, but the length re- mains the same, and is purely a guide to the plating squad in the shop to locate their plates. Proceed to mark off on the paper for this drawing the datum and all the frames or formers to the same scale as the model, then with a strip of paper girth round the frames on the model and mark off all plate edges above and below the datum. Transfer these marks to the " Shell Expansion Drg." and when all the plates are drawn in we have a view showing the position of all plates on one side of the fuselage. Note that any opening, bracket, etc., only occurring on one side of the fuselage can still be indicated on the " Half-Block " model and " Shell Expansion " by labelling same " Stb. only " or " Port only " as the case may he. Having transferred all the plates from the half-block model to the shell expansion and drawn in same, pro- ceed to label all the strakes as Al, A2, Bl, B2, etc., and when finished this drawing should be a complete copy of' the " model " and is used hy the foreman in charge of the plating as a guide for his work. Plate Ordering Last, but not least, the Plate Order List is prepared from the " model." (See Fig. II.) Most of the plates amidships can be scaled off direct, as there is little double curvature, and entered on the order sheet with a J in. extra in length and J in. extra in width. Where a plate has double curvature, as at the nose, place a piece of tracing paper over same and mark the outline of the plate on the paper. When this paper is laid out flat we have the true shape of the flat plate for ordering. This process is called " lifting off.' When these plates come in from the makers or are cut from stock, they are labelled as per list, and when all work is complete thereon they are plated in store, and as they are marked according to the Shell Expansion Drg., the foreman in charge of the fuselage plating knows exactly where each plate goes. It is not sug- gested here that separate departments should handle the plates, but one squad does all the rolling and shap- ing, drilling edges for rivets, etc. With a reasonable amount of good progress work beforehand, there should he no waiting one depart- ment for the other, and when the plates are required for the final riveting up on fuselage, they should be ready in store. Here, perhaps, we should have mentioned that the " Order List " is prepared first from the model, and delivered to the ordering department, who, presum- ably, order same without delay, while the rest of the work is proceeding. Incidentally, the material for the frames, etc., is also " lifted off " the model, and a list made out similar to the plate order list. I have pur- posely refrained from mentioning the frames previously as they may he built-up plates with angles, or " Z " bars, etc., and require a separate drawing for each frame or batch of frames, but it is obvious that any information re the contour of the frames can be obtained from model. In conclusion, the above procedure for lines, plating, etc., is applicable to either a " Monocoque Fuselage " or a flying-boat hull. it HIDUMINIUM R.R.53 B T Under the name " Hiduminium R.R.53 B," High Duty Alloys, Ltd., of Slough, have introduced a new light aluminium alloy. This is the result of many months of research work in the laboratories of the firm, with the object of altering the standard alloys to suit a particular purpose. The new alloy is a slight modi- fication of the well-known Hiduminium R.R.53, which is one of the series of allovs introduced and patented by Rolls-Royce, Ltd. The new alloy is finding wide applica- tion for fast-moving levers, treadles and brackets in the textile and electrical industries, and should also Some parts cast in Hiduminium R.R.53 B. be suitable for the smaller forms of castings in the aircraft industry. The analysis of Hiduminium R.R. 58 B is as follows : Copper ... ... 2.5 per cent. Nickel ... ... 1.5 ,, ,, Magnesium ... 0.8 ,, ,, Iron 1.2 ,, ,, Silicon ... ... 1.2 ,, ,, The physical properties in the various conditions are as follows :— VhM Cast.3 per cent. Maximum Tn£L T^L Elongation TJrinell As cast 'Solution'treated Solution'treated and artificiallyaged Sand 1 As castSolution treated Solution treated and artificially aged The specific gravity is much th- in.Tons 8 1223 Cast Text in. 'Tons 14 22 Burs per cent. Maximum XJ 4J ^t.nn.r .0, Tons/ sq.in. Tons8 12 li) e same as fc Tons/sq " in.Tons 1217 21 3 6 3 1 )i '' Hiduminium ' 75 103 129 ^nt. naraiie.- ^ 80 110 120 ' R.R. 53 alloy Power and throttle curves of De Havilland " Gipsy Six " engine. (See pages 84-86.) 78 h
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