CHANGING PITCH OF A PROPELLER BLADE BY BENDING

摘要

The present invention is directed to a method of altering the pitch of a propeller through localized bending of its blades. To alter t propeller's pitch the camber of at least one of its blades (302) is changed by bending a portion of a trailing edge (308), a leading e (306), or both edges relative to the remainder of the blade. A bent portion can be located away from a tip of the blade at a distanc that is less than or substantially equal to 60% of a radius of the blade, and bending preferably commences at a distance in from an edge of a blade of up to 50% of a section width of the blade. The maximum preferable change in pitch at any location on the radi due to bending is 30%.