Abstract: The fan rotor blade (73) has a root (73a) located at an end at the side of a rotary disk (75), and a tip (73b) located at an outer end in a radial direction of the rotary disk (75), and extends from the root (73a) to the tip (73b). The root (73a) has an attached part (93) attached to a rotor blade fixing part (75a) of the rotary disk (75), and an extension part (95) extending from the attached part (93) toward the upstream side. An upstream end of the extension part (95) is a free end.

Abstract: A blade as a main body of a rotor blade has a suction side made convex and a pressure side made concave so as to have an aerofoil profile. A squealer tip having a back face continuous to the suction side and a front face matching with a center plane of the blade is formed at a distal end of the blade. The front face is coated with a hard coating.

Abstract: A turbofan engine has a fan on a front side thereof and a turbine driving the fan. The turbofan engine includes 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, and a rear moving blade detachably mounted on an outer circumferential surface of the disk. The spiral blade and the rear moving blade form a first-stage moving blade of the fan.

Abstract: The fan rotor blade (73) has a root (73a) located at an end at the side of a rotary disk (75), and a tip (73b) located at an outer end in a radial direction of the rotary disk (75), and extends from the root (73a) to the tip (73b). The root (73a) has an attached part (93) attached to a rotor blade fixing part (75a) of the rotary disk (75), and an extension part (95) extending from the attached part (93) toward the upstream side. An upstream end of the extension part (95) is a free end.

Abstract: A blade as a main body of a rotor blade has a suction side made convex and a pressure side made concave so as to have an aerofoil profile. A squealer tip having a back face continuous to the suction side and a front face matching with a center plane of the blade is formed at a distal end of the blade. The front face is coated with a hard coating.

Abstract: A turbofan engine has a fan on a front side thereof and a turbine driving the fan. The turbofan engine includes 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, and a rear moving blade detachably mounted on an outer circumferential surface of the disk. The spiral blade and the rear moving blade form a first-stage moving blade of the fan.

Abstract: The invention provides a dovetail structure of a fan which attaches the fan 20 having an inlet hub diameter smaller than an outlet hub diameter to a portion around a discoid disc 10 rotationally driven by a turbine. The disc 10 has a plurality of main dovetail grooves 12 extending in parallel to an axis 1 of a rotation axis from a leading edge to a trailing edge thereof. The fan 20 has a main dovetail portion 22 fitted to the main dovetail groove 12, and a sub engagement portion 24 for supporting a front centrifugal force. Further, the dovetail structure is provided with a spin cone 30 engaging with the sub engagement portion 24 so as to be capable of transmitting the front centrifugal force to the disc 10.