| Tilt propeller |
| In 1935, Louis Marmonier of Lyon, France, was granted a patent describing a unique concept for a tilt-propeller aircraft. Two propellers were mounted between dual fuselages of a canard-wing airplane. The propellers were counter-rotating, with one tilting down and one tilting up (i.e. one pushing down and one pulling up), such that their lines of thrust always lay in the vertical plane passing through the center of gravity. There is no evidence that Marmonier ever built his aircraft. |
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Sources:
- The V/STOL Encyclopedia Series: Volume 2 French 10 December 2002.