cyclogyro
...that the paddle-wheel cyclogyro aircraft design refuses to die after almost a century of failed attempts to build one?
...that the paddle-wheel <b id="mwFDI"><a href="./Cyclogyro" id="mwFDM" rel="mw:WikiLink" title="Cyclogyro">cyclogyro</a></b> aircraft design refuses to die after almost a century of failed attempts to build one?