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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Aeroplanes and Dirigibles of War by Frederick A. Talbot: the Germans, appreciable enterprise was manifested in another
direction. The airship was not absolutely abandoned: vigilance
was maintained for a superior type of craft. It was an instance
of weighing the advantages against the disadvantages of the
existing types and then evolving for a design which should
possess the former without any of the latter. This end appears
to be achieved with the Astra type of dirigible, the story of the
development of which offers an interesting chapter in the annals
of aeronautics.
In all lighter-than-air machines the resistance to the air
offered by the suspension ropes is considerable, and the
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