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Aviation History
1925
1925 - 0694.PDF
OCTOBER 22, 1925 the envelope was not braced diagonally. The ascentional forces and the loads were concentrated in the verteces of the pentagon. With this new and original type of framing, Sig. Nobile said, he aimed at securing essentially the following points :— (a) To give the framing a considerable height (and so be well- proportioned to the bending moments which stressed it) without, however, being obliged to increase the bulk in height of the dirigible, with a consequently misplaced utilization of the space available in the hangar, and, on the other hand, without being obliged to renounce a considerable volume of gas. (6) To give the framing sufficiently large transversal dimen- sions and such that, under the actio'n of the gas pressure, the envelope assumed a transversal profile which was suffi- ciently approximate to the circular shape. major transversal dimensions of the framing permitted a morerational attachment of the handling lines, thereby facilitat- ing all manoeuvres. (d) To make the flexible part of the hull (the fabric) lesssensitive to variations of internal pressure. (c) To furnish a more efficient and more rigid support thanthe present one both for the nose-stiffening and for the tail- surfaces. In fact, the upper central longitudinal elementof the framing ran up to the centre of the stiffening cupola which was thus very solidly supported, while in the stern,a light and robust metal structure, rigidly supporting the horizontal surfaces and the elevators, was rabbetted into theframing. Unlike the fs.2, these fixed and mobile surfaces were in this case located in the equatorial plane, therebyincreasing efficiency thereof. But the chief characteristic of Ithe new type of framing THE N. 51,000 CUB. M. SEMI-RIGID AIRSHIP : Drawings showing, above, the rear portion of the central keel framework and horizontal tail surfaces, and, below, the main central cabin. This is divided into four main sections : control (including wireless and captain's quarters) ; general saloon ; sleeping berths and lounge ; offices. Various advantages accrued therefrom and also, in par- ticular, a small reduction of the area of the main section with a consequent minor resistance to advance, and a minor purchase by flanking winds (thereby facilitating operations in leaving and entering the hangar). (c) In view of the considerable transversal dimensions of the framing, there was the possibility of suspending tc it, iQ a simple and efficient manner, the engine nacelles with such a distribution that the propellers were superimposed one over the other in their projection in a plane normal to the axis of the dirigible to the least possible amount, thus obtain- ing an increase of propeller efficiency. Furthermore, the consisted in the fact that the gas chamber, where located between two transversal sections, was able to expand in the shape of sacks inside the lateral prisms, so that after all, the volume lost for the gas was merely that corresponding to the central prism. One of the accompanying illustrations gives an idea of the control cabin, which in this type of dirigible was also incor- porated in the framing. It offered a minimum resistance to advance and the dimensions were such as to permit the proper installation of all fitments necessary for navigation, and also afforded comfortable accommodation for both crew and passengers. 694
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