| 摘要 |
PROBLEM TO BE SOLVED: To facilitate transportation by offsetting the weight of an airframe, and becoming lighter by the buoyancy portion near the ground. SOLUTION: Helium gas or hydrogen gas which are light gas are put in a doughnut type balloon 11, and the buoyancy of the light gas is used to mount rotary wings 12 to the center of the doughnut type balloon. With this structure, a heavy object can be easily transported by both the lift of the rotary wings and buoyancy of the gas.
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