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Five sections, eighteen entries. Everything on the site is one click from here.
- The flapping hingeOn a rotor moving forward the advancing blade meets far more airflow than the retreating one
- Dissymmetry of liftThe underlying problem stated plainly: one side of the disc is always doing more work than the other.
- AutorotationAn unpowered rotor keeps turning in the airflow as the machine descends
- Direct controlTilting the whole rotor head rather than working control surfaces in its wake was the step that made the machine properly flyable.
- Jump take-offSpinning the rotor up on the ground and then changing pitch lets the machine leave almost vertically.
The complete register, in one table: all eighteen entries.