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R23X-class airship
The British R23X class of rigid airships were developed during World War I using the experiences gained from the 23 class, but only two of the planned four R23X class were built: ''R27'' and ''R29''. Both were completed mid-1918, but just two-and-a-half months after entering service ''R27'' was destroyed by fire in a hangar; while ''R29'' went on to become the most successful British wartime rigid airship, being the only one to meet enemy action.〔(HMA 23X ) Airship Heritage Trust. Retrieved on 10 March 2009.〕
==Design and development==
The Vickers-designed 23 class rigid airships, which were basically "stretched" and modified versions of the No. 9 design, were never used in combat; however, the four ships in the class provided many hours of valuable training for British airship crews and experimental data for designers and engineers, and some radical changes and refinements were consequently incorporated into the design of the R23X class. Originally four R23X class were planned, ''R27'' to ''R30'' consecutively, but the programme was re-evaluated following the forced landing of ''L 33'' in Little Wigborough, Essex, on 24 September 1916.〔 British engineers gained a valuable insight into the state of German rigid airship design and technology when they examined the virtually intact Zeppelin, and it was subsequently decided to cancel ''R28'' and ''R30'' in order to concentrate resources on an improved design, the new R33 class.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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