Patent ID: 7721526

Claim:
A turbofan engine having a fan on a front side thereof and a turbine driving the fan, the turbofan engine further comprising: a disk rotationally driven by the turbine; a spinner detachably mounted at a front side of the disk; a spiral blade integrally mounted on a surface of the spinner, wherein the spiral blade is spirally extended to an axial position of a front end portion of the spinner; and a rear moving blade detachably mounted on an outer circumferential surface of the disk at the downstream side of the spiral blade; wherein the spiral blade and the rear moving blade form a first-stage moving blade of the fan, the spiral blade has a rear end having a first radial height defined with respect to an axis of the engine, and the rear moving blade has a second radial height, defined with respect to the axis, that is greater than the first radial height.