| 21. | The proposed system employs three separate airship stages to reach orbit.
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| 22. | It is the end of the Austro-Hungarian airship program.
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| 23. | Patrick Alexander applied his mind to this problem of airship propulsion.
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| 24. | Four airships were delivered to the U . S . Navy.
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| 25. | Ferdinand von Zeppelin completed his first airship, the Daimler engines.
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| 26. | During World War 1 the Zeppelin company built 95 military airships.
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| 27. | The incident was a severe blow to the Soviet airship program.
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| 28. | Three additional Parseval pattern airships were also built during this period.
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| 29. | The airship sheds at RAF Cardington were used to practice on.
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| 30. | Like the powered airship, such balloons are often called blimps.
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