| 摘要 |
The invention relates to a balloon inflated with helium. In a vertical annular corridor 2, the user 14 walks, and causes the assembly to turn in the fashion of a squirrel cage, while the lighter-than-air vehicle is in flight. The retractible blading 12 causes the lighter-than-air vehicle to make progress. Application: lighter than air vehicle whose forward movement is controlled by the muscle power of the user 14. <IMAGE>
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