Propeller, method of designing propeller, propeller design method program and information storage medium

摘要

[Problem] To provide a propeller which is configured to be lightweight, maintains a loop shape during rotation, and has low noise, a propeller designing method, a propeller designing method program, and an information storage medium. [Solution] A propeller comprising a rotating blade connected around a rotating shaft, and including: a first rotating blade portion which includes a first blade upper surface and a first blade lower surface and has a sweepback angle; and a second rotating blade portion which includes a second blade upper surface and a second blade lower surface and has an advance angle. The second blade upper surface is continuous with the first blade lower surface. The second blade lower surface is continuous with the first blade upper surface. The first rotating blade portion and the second rotating blade portion form a loop shape. When the rotating blade rotates about the rotating shaft, at least a part of a central line of the rotating blade has a shape, formed in at least a partial arbitrary position, corresponding to the shape of a catenary line such that a tension and a centrifugal force acting in a first direction of the rotating blade are balanced, and such that a tension and a centrifugal force acting in a second direction of the rotating blade are balanced.