A curved body (830), for propelling fluids, crafts and harvesting fluid power, comprises a convex outer leading surface securely connected to a concave inner trailing surface to define an open vessel. Upon oscillation, ambient fluids are accelerated and ejected from the vessel to propel the vessel and the ambient fluids in opposite directions. Apparatus is secured to a motive power source directly or via actuating member (832), by fastening through aperture (834). The oscillating propulsor can be operated directly by a reciprocating motive power source, and indirectly by the reaction momentum imparted to a supporting base. Thrust may be vectored by rotation of the curved body (830) about the supporting base. Drag reduction using fluid dynamic shapes, intake openings, a fore fin (844), an aft fin (846), and a lubricant cavity, are embodied. Enhanced propulsion using multistage oscillating propulsors is embodied.

A curved body (830), for propelling fluids, crafts and harvesting fluid power, comprises a convex outer leading surface securely connected to a concave inner trailing surface to define an open vessel. Upon oscillation, ambient fluids are accelerated and ejected from the vessel to propel the vessel and the ambient fluids in opposite directions. Apparatus is secured to a motive power source directly or via actuating member (832), by fastening through aperture (834). The oscillating propulsor can be operated directly by a reciprocating motive power source, and indirectly by the reaction momentum imparted to a supporting base. Thrust may be vectored by rotation of the curved body (830) about the supporting base. Drag reduction using fluid dynamic shapes, intake openings, a fore fin (844), an aft fin (846), and a lubricant cavity, are embodied. Enhanced propulsion using multistage oscillating propulsors is embodied.

The embodiments of the disclosure provide a driving device for an aircraft and an aircraft, and the driving device includes a first energy storage motor device, a second energy storage motor device, a third energy storage motor device, a fourth energy storage motor device and a crankshaft, wherein a first end of the crankshaft is fixedly connected to the first energy storage motor device, and a middle portion of the crankshaft is connected to the second energy storage motor device, the second energy storage motor device is connected by a supporting portion to the third energy storage motor device, and the fourth energy storage motor device is provided at a output end of the third energy storage motor device, power output directions of the first energy storage motor device, the second energy storage motor device, the third energy storage motor and the fourth energy storage motor device are different from each other. The embodiment of the disclosure, by providing multiple energy storage motor devices, can make the wings of the aircraft achieve different individual movements, and the combination of the multiple individual movements can form complex spatial movements, thereby making the sailing modes of the aircraft more diverse, and making the bionic effect better.

A Pulsed Locomotor (120), for propelling media, fluids and crafts, in fluids and on land, comprising a blade (124) securely connected to a drive shaft (122). Upon reciprocation, the ambient medium is forced towards the trailing edge of the blade (124) thereby causing a reactive locomotion of the apparatus, substantially along the plane of the blade. Apparatus is secured to motor M by fastening through aperture (130). The apparatus can be operated directly by motor M, and indirectly by the reaction momentum imparted to a supporting platform P. Thrust is directed by steering handle (128) about a bearing (126), rotatably coupling to platform P and base C. Lubricant L is supplied to outlets (134) via conduit (136) and inlet (132), to coat the apparatus with a lubricant cavity, for drag reduction. The blade (124) planes along a figure 8 reciprocation path s1e1s2e2s1. Crafts are embodied.

A Pulsed Locomotor (120), for propelling media, fluids and crafts, in fluids and on land, comprising a blade (124) securely connected to a drive shaft (122). Upon reciprocation, the ambient medium is forced towards the trailing edge of the blade (124) thereby causing a reactive locomotion of the apparatus, substantially along the plane of the blade. Apparatus is secured to motor M by fastening through aperture (130). The apparatus can be operated directly by motor M, and indirectly by the reaction momentum imparted to a supporting platform P. Thrust is directed by steering handle (128) about a bearing (126), rotatably coupling to platform P and base C. Lubricant L is supplied to outlets (134) via conduit (136) and inlet (132), to coat the apparatus with a lubricant cavity, for drag reduction. The blade (124) planes along a figure 8 reciprocation path s1e1s2e2s1. Crafts are embodied.

A mono-fin for swim training is disclosed. The mono-fin has two separated boot structures that from two separate foot cavities for holding feet with toes positioned in front regions of each of the boot structures and heels positioned at back regions of each of the boot structures. The mono-fin has a mono-fin structure connecting the boot structure through the front regions of each of the boot structures. In a middle region of the mono-fin structure and between the front regions of the boot structures, there is flex region. The flex region allows angles between the boot structures and distances between the back regions of the boot structures to be changed by a swimmer while swim training.

The disclosure relates to a fluid outlet interface for a personal watercraft, so that the latter can collect and divert a very small portion of the fluid pressurized by said vehicle and thus create a sufficient Venturi effect to drive the emptying of the bilge of said vehicle. The disclosure also relates to a personal watercraft, or more generally any floating device delivering a pressurized fluid, comprising such an interface.

The disclosure relates to a fluid outlet interface for a personal watercraft, so that the latter can collect and divert a very small portion of the fluid pressurized by said vehicle and thus create a sufficient Venturi effect to drive the emptying of the bilge of said vehicle. The disclosure also relates to a personal watercraft, or more generally any floating device delivering a pressurized fluid, comprising such an interface.

A bionic pectoral fin propelling device based on a planetary gear train, including a frame, a power source (1), a propelling part (2), left and right maneuvering parts (3), a fixed support plate (4), a movable support plate (5), a left pectoral fin (6), a right pectoral fin (7), a fish body (8), and a tail fin (9). The fixed support plate (4) and the movable support plate (5) are installed on the frame parallel to each other; the fixed support plate (4) is located in front of the movable support plate (5); and the left and right maneuvering parts (3) are located between the fixed support plate (4) and the movable support plate (5). The present invention solves the problem that the two pectoral fins are not synchronized, realizes variable speed propelling and left/right maneuvering, facilitates increasing the bearing capacity of the propelling device, and is particularly suitable in limited space applications.

A watercraft having propulsion means extending below the water line comprising a pair of flexible fins each adapted to oscillate through an arcurate path in a generally transverse direction across the central longitudinal dimension of the watercraft. As input force is applied, the fins twist to form an angle of attack for providing forward thrust while moving in both directions along the arcurate path. Each of the fins have a generally squared off top and preferably an outer area of harder rubber than the inner area. Each of the fins can be adjusted at the trailing edge to provide adjustable tensioning of the trailing edge.