Abstract: A ship model having an elongated ship body configured in such a way that the ship body is divided over its longitudinal extent (L) into a plurality of segments that can move relative to one another and can be lowered below a water surface.

Abstract: The invention is Sinkable Toy Warships, in particular, remotely controlled toy boats that can shoot water, be shot at by other boats, retain water that hits them directly, continue to be operational after being hit, sink when a predetermined volume of water has been absorbed, remain near the surface where it can be located and can be recovered after being submerged with no ill-effects to the electric and electronic components on board.

Abstract: The present document describes an entertainment device including one or more mini-crafts provided in a fluid medium within the sides of an electromagnetic frame. Each mini-craft includes a magnet and has a different cutoff frequency. Motion of the mini-crafts may be controlled by a user using a controller such as joystick, remote control etc. A processor computes, based on the multidirectional navigation signals received from the controller, electromagnetic signals for each coil in the electromagnetic frame. The electromagnetic signals are amplified and sent to the coils to generate superimposed rotating magnetic fields which cause the mini-crafts to rotate separately within the electromagnetic frame, each mini-craft following a distinct magnetic field with a frequency that is lower than its cutoff frequency.

Abstract: The present document describes an entertainment device including one or more mini-crafts provided in a fluid medium within the sides of an electromagnetic frame. Each mini-craft includes a magnet and has a different cutoff frequency. Motion of the mini-crafts may be controlled by a user using a controller such as joystick, remote control etc. A processor computes, based on the multidirectional navigation signals received from the controller, electromagnetic signals for each coil in the electromagnetic frame. The electromagnetic signals are amplified and sent to the coils to generate superimposed rotating magnetic fields which cause the mini-crafts to rotate separately within the electromagnetic frame, each mini-craft following a distinct magnetic field with a frequency that is lower than its cutoff frequency.

Abstract: Self-propelled hydrodynamic underwater toys with integrated propulsion mechanisms are described. In some embodiments, the propulsion mechanisms is partially or completely within an internal compartment in the toy's body. The propulsion mechanisms are adapted to be charged with a volume of fluid and to thereafter discharge the volume of fluid under pressure to propel the toy through a body of water. In some embodiments, the propulsion mechanism includes an expandable reservoir. In some embodiments, the propulsion mechanism is a replaceable propulsion mechanism. In some embodiments, the toy includes a trajectory-stabilizing structure that is adapted to impart at least one of a steering moment and a righting moment to the toy during underwater travel. The toy may be adapted to have positive, negative or neutral buoyancies, and can be adapted to maintain its buoyancy and/or its center of gravity while being propelled through a body of water by the propulsion system.

Abstract: A diving toy that is comprised of a housing with a motor, battery and magnetic reed switch positioned inside the housing. A propeller is attached to an axle of the motor protruding through the rear end of the housing. A ballast is arranged inside the housing to provide positive buoyancy and a front end down attitude. A plurality of fins protrude from the housing surrounding the propeller for improving directional stability. A lever having one end rotatably mounted to the outside of the housing and another end provided with a magnet.

Abstract: The present invention provides an on-water/underwater movable toy which has the optimal form for high-speed on-water cruising like a leisure boat and a racing boat, and which can also cruise underwater. The on-water/underwater movable toy according to the present invention comprises: a hull having a boat-shaped deck board that is in close contact with a boat bottom without any clearance therebetween; a screw mounted under said boat bottom; a ladder controllably mounted on said boat bottom; a recess prepared on a boat stern, the recess getting deeper toward the direction of movement; and an elevator disposed at the lower end of said recess, having a shape similar to that of said recess, and being controllably pivotable about a horizontal axis defined by the two elevator-holding axis supports projecting downward from the rear portion of the boat bottom.

Abstract: A kit for demonstrating Archimedes' principle, comprising a tub having an overflow spout, such that when fluid reaches the overflow spout, all additional fluid added to the tub will flow out the overflow spout; and a stable boat sized to float in the tub without touching the sides of the tub. The kit may further comprise a balance beam which can balance a tub edge, wherein one end of the balance beam has an attachment mechanism for attaching a counter weight, and the other end has an attachment mechanism for attaching a sample weight, such that when the sample weight is attached, and the balance beam is balancing on the tub edge, the sample weight will be submerged in the fluid. There is also a method for using this kit to demonstrate Archimedes' principle both for the buoyancy of a floating body, and the buoyancy for objects that don't float.

Abstract: A device for recreational and educational use includes a substantially cylindrical section having a first end, and a second end. A cavity is disposed within the substantially cylindrical section to receive fluid when the device is immersed in a body of fluid. The substantially cylindrical section decreases in radius toward the first end and present a low drag profile to impinging fluid flow. Control surfaces are included on the substantially cylindrical section. A stabilizer is coupled with the substantially cylindrical section, to stabilize motion of the device in the body of fluid when the device is launched by a user. The device can be hand-launched by a user. Energy storage assisted launch mechanisms are also described that assist the user during submarine launch of the device.

Abstract: A hand-launchable underwater projectile toy having a hydrodynamic body and a novel trajectory stabilizing structure extending from the body and configured to impart a righting-moment to the body during underwater travel. The stabilizing structure includes one or more drag-producing surfaces extending in a non-radial direction about the central axis. In another embodiment, the stabilizing structure includes at least one portion that is user-adjustable to impart a selected steering-moment to the body during underwater travel. In a further embodiment, the toy includes a positively buoyant first portion and a negatively buoyant second portion, which cooperate to urge the body into a selected orientation when the toy is suspended in water.

Abstract: A water propelled toy torpedo including a main housing having an open forward end and an open rearward end. A battery pack is disposed within the main housing inwardly of the open forward end. A battery cap is disposed within the open forward end of the housing in communication with the battery pack. A forward portion has a micro switch extending forwardly therefrom. A motor is disposed within the open rearward end of the main housing. The motor is in communication with the battery cap. The motor has a shaft extending rearwardly therefrom whereby an outer end of the shaft is disposed outwardly with respect to the open rearward end of the main housing. A transparent cap portion couples with the open forward end of the main housing. The cap portion has an open inner end and a closed arcuate outer end. The arcuate outer end has a post extending inwardly from an inner surface thereof. An inner end of the post selectively contacts the micro switch of the battery cap to facilitate activation of the torpedo.

Abstract: The present invention relates to a vertically sinkable toy ship model comprising a plurality of compartments having a plurality of correspondent holes to provide fluid communication between the compartments. When the toy ship model is set for sinking, water enters into the first compartment of the hull through an adjustable opening to cause the ship model to tilt forward to initiate sinking with the aid of a weight until the water level reaches the first wall hole between the first compartment and the second compartment whereby the water will then flow from the first compartment into the second compartment via the first compartment wall hole to cause the sinking ship to rise into a vertically standing position in the water; the water will likewise proceed to fill the last compartment, at which point the water will fills the entire hull to cause the sinking ship to submerge under water.

Abstract: A ballast system for toy submarines comprises a plumbing device, a flexible bag, a piece of wire and a rod. The ballast system draws water in and forces water out by decompressing and compressing the flexible bag.

Abstract: A personal buoyancy boat device for use in water sports games employs an inflatable inner tube retained within a housing of generally torroidal shape. A buoyant deck panel is disposed above the housing and secures two valves emergent from the tube, a first valve for deflation, and a second valve for inflation. A water-collecting target assembly is disposed above the deflation valve. When the target assembly fills with water, its added weight causes depression of the deflation valve, causing the boat device to ride lower in the water. The buoyant deck panel prevents the total submersion of the boat device.

Abstract: A toy for the bathtub and having a somewhat conical chamber in which a quantity of suds and bubbles may be confined. The chamber merges upwardly with a restricted passageway which in turn terminates upwardly in a nozzle. Displacement downwardly of the toy in the water causes forceful ejection of the suds and bubbles from the nozzle.