PROBLEM TO BE SOLVED: To provide a propeller with large torque having a shape that can make a propeller provide large rotation torque.SOLUTION: At a cross section of a maximum chord length part 3B of a vertical lift-type blade 3, a front edge is shaped into a spherical surface and a curved surface is shaped from the diameter part thereof to a rear edge so that a water flow passing along a rear face flux line V along the curved rear face 3G thereof crosses at 30 to 45 degree relative to a chord center line K of the blade on the rear edge 3G.SELECTED DRAWING: Figure 3
風水車用のプロペラ
2020-03-18
Patent
Elektronische Ressource
Japanisch