| 摘要 |
An aircraft comprising an envelope ( 6 ) that is inflatable with a lifting gas that is lighter than air that, at least when inflated has curved upper and lower surfaces. The aircraft has a payload carrying means ( 5 ), and an aerodynamic lifting means ( 8 ) for creating a vertical annular flow of air that induces a flow of air over the respective upper or lower surface ( 12, 14 ) of the envelope (6.). One form of aerodynamic generator ( 8 ) comprises a plurality of aerofoil blades ( 20 ) mounted for rotation around a periphery of the envelope ( 6 ). |
