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Aviation History
1920
1920 - 1043.PDF
SEPTEMBER 30, 1920 are of the multiplane type, and consist of three superimposed horizontal planes with elevator flaps hinged to each and eight vertical surfaces and rudders, the whole being mounted on the rear of the keel. In addition two horizontal and one vertical fins are mounted on the stern of the envelope. Two sets of controls are provided within the keel, one fore and one aft. The principal characteristics of the " Roma " are :— Overall length] ... ... ... 410 ft. Diameter ... ... ... ..." 82 ft. 6 ins. Height 90 ft. 3 ins. Capacity ... ... ... ... 1,200,000 cu. Weight (fully lalen) ... ... 37 tons. Disposal lift ... 19 tons. Max. speed ... ... ... 80 m.p.h. - Power-plant ... ... ... 6 x 400 h.p. ft. RIVETING OF NARROW TUBES THE following description of a method of riveting narrow tubes from the inside, by Dr.-Ing. Theobald, is taken from the German journal Lufifakvl of July 1, 1920.* In aircraft construction many kinds of tube connections or connections of struts with tubes axe made by means of riveting. This involves the insertion of the rivet into the rivet hole from the inside, and thus the rivet must be passed Figs. 1-4 show such a contrivance for fixing rivets. It consists of a head c, tubular in shape, and of a width corres- ponding to the diameter of the tube to be riveted, which is pushed forward to the required position for the rivet by a rod, which is also tubular. A forked slot between the lugs 11 permits of the adjustment of the tool on to a mandrel passed through the rivet hole. A pusher S is fitted in the Figs. 1 to 4. Figs. 10 to 15. Figs. 5 to 9. Figs. 16 to 18. through the tube to its position. This is a difficult process, as often these tubes are only a few centimetres in diameter, and very delicate devices must be used to accomplish it. Recently the Airship Construction Firm Schutte Lanz at Mannheim-Rheinau have "produced a set of tools whereby the rivets can be passed through and fixed in narrow tubes. • Issned by Controller of Information. head c on to the perpendicular ribs g g. This takes the head of the rivet in a groove, into which it is pressed by a forked spring plate /. The pusher 5 can be moved upwards by means of a bell crank lever h, the horizontal arm of which fits into a slit in the pusher, and which is generally kept down by a leaf spring e. In this position the rivet is inserted in the groove outside the tube, then the tool is pushed into 1045
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