| 摘要 |
In a hot air airship including an elongate gas envelope aerodynamically shaped for horizontal flight with a pressure hot air generator for pressurizing the envelope and tail members on the envelope, a gondola below the envelope and power driven member for propelling the envelope horizontally, a method and structure for releasing over pressure from the airship envelope and for regulating its ascent and descent by a variably controllable first vent in the front end of the airship and a second variably controllable vent at the aft end of the airship, each of which functions to release air at a controlled rate to cause heated air to move toward either end and cause either end to ascend.
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