| 摘要 |
The engine has vertical props (1) disposed within a circle (4). It also has cross beams (5) connected to the props, at each of several stages, and meeting at the centre of the circle. At the centre of the circle is a vertical axis (7). At each stage, a wind device is rotatable about the vertical axis. The vertical axis can either be common to several stages or an axis is provided for each stage. |
