Abstract: A method for making blade unit with divided shaft facilitating drastically the productivity and assembling compared to a method fixing blade to a shaft using many connecting parts. The method for making blade unit includes steps for making a blade with divided shaft comprising a blade and a divided shaft that is attached integrally to a root portion of the blade and divided into a plurality of portions in a direction of length of the shaft, and combining a plurality of made blades with divided shaft together with one another through the divided shaft.

Abstract: The invention relates to a rotating machine for interaction with a fluid medium, comprising a rotor with one or more blades with which energy is extracted from or relinquished to the medium. The blade extends helically or spirally along the rotor axis. The projection of the blade forms in the flat plane a continuously narrowing strip spiralling around a centre point. The blade is preferably membrane-like. As seen in side view the blade has a cone-shaped end situated on the downstream side of the fluid medium.