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Aviation History
1919
1919 - 1124.PDF
,|QHJ AUGUST 21, 1919 these airshipsjwas based on that of previous ships built by the Parseval Co., but with radical alterations to suit the requirements of the Admiralty. The most important of these were the following : Swivelling propellers were to be fitted to facilitate handling and landing of these ships by inexperienced pilots, and the cars were to be specially designed of a very robust construc tion to enable them to stand heavy landings on the ground, and also were to be fitted with a watertight double bottom to enable them to land on the sea. The shape of the envelope was greatly improved from that of previous "• Parseval " airships as the result of a series of model experiments carried out by the Parseval Co. at Got- tingen, Germany. The system of weight distribution to the envelopes was a new system recently brought out and patented by the Parseval Co. In this the car was hung from a relatively small suspension gurt on the underside of the envelope from which the weight was distributed over the whole surface of the envelope by means of a system of " tra jectory " bands, beyond serving to distribute the weight and reducing the bending moment in the envelope with a conse quent reduction in the inflation pressure required, also considerably strengthened the fabric to resist tearing, etc. The nose was reinforced by a series of steel tubes to prevent it being pushed in by the air pressure when flown at full speed. The ballonets were provided, of a total capacity of 30 per cent, of the gross value of the envelope,»and an air pressure of 25 m/m in these served to keep the envelope in perfect shape. With the ballonets of this size, the ships were enabled to rise to a height of io.ooofeet. The envelope was provided with the usual gas valves, ripping panels, and other fittings, and was also fitted with a gun platform on the top of the envelope reached by an access tube through the envelope. The car was a very strong and rigid structure built with a " Duralumin " framework and plating. It was constructed Four views showing the progress in the construction of a Vickcrs rigid. Reading from left to right, at the top the transverse frames being assembled on the floor, and a completed section of hull in vertical position. Bottom, a completed section lifted and turned over ready for laying on the erecting cradle, and view looking down inside the completed hull structure. 1126
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