Abstract: Provided is a magnetic-geared motor that can suppress eddy current flowing inside a fastening member and reduce power loss. The magnetic-geared motor includes: a stator; a first rotor provided rotatably relative to the stator and including a plurality of magnetic pole pieces and a plurality of spacers disposed so as to be arranged in a circumferential direction; and a second rotor provided coaxially with the first rotor. Each spacer is composed of a plurality of divisional spacers disposed apart from each other in an axial direction, and a plurality of fastening tools for fastening the plurality of divisional spacers in the axial direction, and the divisional spacers and the fastening tools are electrically insulated from each other.

Abstract: Swimmer's downkick causes a swim fin to be incurved transversely thereof to generate a powerful propulsive force. The swim fin 1 comprises a foot pocket 2 and a propulsion blade 3 which is, in turn, provided at the transverse middle and between this transverse middle and respective side rails 6, 6 with a groove 15 and grooves 16, 16, respectively, wherein each of these grooves 15, 16, 16 is curved convexly from the topside toward the underside of the propulsion blade 3 and extends from a forward end of the propulsion blade 3 toward the foot pocket 2. The swim fin 1 is integrally molded from a hard type elastic material 40 and a soft type elastic material 30, wherein opposite side edges 10, 10 of the propulsion blade 3 are formed from the hard type elastic material 40 and a zone defined between these side edges 10, 10 is formed from the soft type elastic material 30.