| 摘要 |
Single engine aircrafts, spot light, seaplanes, ultra-light planes, gyro-planes, power parachutes, trikes, airship etc commonly use fixed pitch low efficiency propellers that generate unbalancing torque. Pilots need to make offset turning to anti-torque. The subject novel anti torque coaxial counter rotation Bi-Prop Rotor fill out the empty of such variable and reversible thrust anti-torque propulsion device. The Bi-Prop Rotor comprises an on axis driving compact unobvious gear box; 2 sets multiple blades prop-rotors with variable pitch push rods and bearing-plate assemblies, co-axial tandem mounted at both sides of the gear box; a set sliding bridge mechanism that synchronized the tandem prop-rotors blade pitch turning; and a driving pulley chain or bell driving system. When engine power up the driving pulley, the primary prop-rotor mounted with the pulley rotates, and drives the gear box. The gear box converts rotation to counter direction in the same RPM, and drives the second prop-rotor on axis end rotating. This bi-prop rotor has multiple unique features: A, anti-torque; B, linear vary blade pitch angle and thrust; C, can reverse blade pitch direction to produce reversed thrust to do air speed deceleration, or air braking; D, has extraordinary aerodynamic efficiency; E, substantially produces a lot more thrust with same engine power.
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