| 摘要 |
A method and system for developing a propulsive force for driving different types of water, air or land vehicles. Four blades (32, 33, 34 and 35) having preferably airfoil sections are rotated around the axis of the driving shaft (11) and around two perpendicular intercrossed axes (18, 19, 20 and 21) so that each blade lies generally in a plane perpendicular to the intercrossed axis around which it is rotated. During such double rotation the radial extensions of the blades relative to the driving shaft are changing as a function of the angle of rotation. As a result, both sides of the blades are being used consecutively as paddling surfaces and the speed of paddling motion of the blades is changing during each stroke. The rotated blades can work simultaneously both in a paddling manner and as a screw propeller. In preferred embodiments of the propulsion apparatus, the blades are constrained by planetary gear engagements in the gear-boxes (16) to rotate synchronously around the axis of the driving shaft and around the intercrossed axes. The propulsion system can include two or more parallel driving shafts(11) rotated in opposite directions for developing a unidirectional propulsive force.
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