Abstract: An underwater man-powered mechanical propeller includes a screw propeller arranged on a screw propeller shaft and encircled by a concentric protective ring. One side of the protective ring is provided with a supporting plate on which a first gear and a second gear mesh with each other, and a transitional gear and the second ear form a meshing pair. The drive shaft of the transitional gear passes through the supporting plate and has a second bevel gear, which meshes with a first bevel gear provided on the screw propeller shaft. The first gear is connected to a first connecting rod and the second gear is connected to a second connecting rod.

Abstract: An underwater man-powered mechanical propeller includes a screw propeller arranged on a screw propeller shaft, the screw propeller is provided with a first bevel gear arranged at the back part thereof, and is provided with a concentric protective ring on the outer side; one side of the protective ring is provided with a supporting plate; the supporting plate is provided with a first gear and a second gear meshed with each other, and a transitional gear is also arranged thereon and forming a meshing pair together with the second gear; the drive shaft of the transitional gear penetrates through the supporting plate, and one end thereof located in the protective ring is provided with a second bevel gear. The first gear is connected to a first connecting rod, the second gear is connected to a second connecting rod; and the screw propeller shaft is provided with a one-way flywheel thereon.