| 摘要 |
The invention relates to a dirigeable balloon which is provided with an inner enclosure (V2) that has a flexible wall (4) and is contained in a rigid outer enclosure (15) which forms an aerodynamic shape. The inner enclosure (V2) containing helium is provided with means (5,6,7,8) which enable the volume to be modified. According to the volume given to the inner enclosure (V2) of the dirigeable balloon, landing, take-off and variations in altitude can be performed with ease. The means enabling the volume of the inner enclosure (V2) to be modified comprise a cable (8) which is connected to the inner enclosure (V2) by means of pulleys (5,6) and a winch (7) enabling the length of the cable to be reduced.
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