摘要: There are several kinds of air vehicles, which are expected to be able to stay for a long period at about 20km altitude by solar power. Here, we seek for substantially commercial realization of cost effective stratospheric long-en... 展开 There are several kinds of air vehicles, which are expected to be able to stay for a long period at about 20km altitude by solar power. Here, we seek for substantially commercial realization of cost effective stratospheric long-endurance air vehicles from a safe and socially acceptable point of view, for which we propose unmanned hybrid airships that combine advantages of airplanes and fully buoyant airships. In this analytical study, we have found an adequate experimental model of hybrid LTA vehicles which is somehow easy to construct and is expected to stay for a couple of days over Tokyo area for demonstration purposes. 收起