TL;DR: In this paper, a single blade propeller is incorporated into fixed and rotary wing VTOL aircraft as part of a first propulsion system, which may include one or more single-bladed propellers driven by electric motors, combustion engines and/or hybrid engines.
Abstract: This disclosure is directed to a single blade propeller and systems, devices, and techniques pertaining to assisting in critical stages of flight (e.g., takeoff, landing, emergency situations, etc.) in vertical takeoff and landing (VTOL) aircraft. The single blade propeller may be incorporated into fixed and rotary wing VTOL aircraft as part of a first propulsion system. The first propulsion system may include one or more single blade propellers driven by electric motors, combustion engines, and/or hybrid engines. Each of the single blade propellers may include a lift-producing blade and a counterweight opposite the lift-producing blade. As each of the single blade propellers spins, it may produce lift in a direction approximately perpendicular to the horizon to effect vertical flight.
TL;DR: An improved performance propeller employs a single propeller having an axis of rotation and a centripetal force about the axis as mentioned in this paper, and a pitch control unit is mounted opposite the single propellers blade.
Abstract: An improved performance propeller employs a single propeller blade having an axis of rotation and a centripetal force about the axis. A pitch control unit is mounted opposite the single propeller blade and has a compensating centripetal force with respect to the single propeller blade about the axis.
TL;DR: In this paper, a single-blade propeller is used to move a watercraft forward by locking a deflection unit to secure nominal pitch of the propeller despite constantly changing direction of turning.
Abstract: The device is formed as a single-blade propeller (1), to move a watercraft forward. It is fastened to the stern (2), and is operated by a tiller (3). It has a deflection unit, to secure nominal pitch of the propeller despite constantly changing direction of turning. The unit automatically turns the device on its axis at the end points of the turning movement. Locking of the deflection unit causes the device to act as a conventional ship's rudder. USE/ADVANTAGE - Oscillating propeller can be moved to-and-fro very easily without previously acquired skill, to move watercraft forward, is operated by hand, and can be used in waters where motorboats are prohibited.