The embodiment relates to a balanced propeller and to an extrudable metal polymer composite and process for making and using the composite to make balancing weight strips for marine or boat propellers. Metal particulate of adequate particle size is mixed with a polymer that is extruded or injection molded to form a high-density weighted strip.

The embodiment relates to a balanced propeller and to an extrudable metal polymer composite and process for making and using the composite to make balancing weight strips for marine or boat propellers. Metal particulate of adequate particle size is mixed with a polymer that is extruded or injection molded to form a high-density weighted strip.

A fluid machine (1) having an intake part (21), a discharge part (26), and an impeller (24), the impeller (24) being arranged in an enclosure (18), and a transmission (90) arranged in the enclosure (18) and operationally connecting a rim (11) of the impeller (24) with an energy converter (2,2′).

A fluid machine (1) having an intake part (21), a discharge part (26), and an impeller (24), the impeller (24) being arranged in an enclosure (18), and a transmission (90) arranged in the enclosure (18) and operationally connecting a rim (11) of the impeller (24) with an energy converter (2,2′).

A propeller, impeller or mixer comprising at least one blade, the blade having a suction surface and a pressure surface which extend from a leading edge to a trailing edge of the blade and a radially-outer tip region, wherein five to one hundred duct openings are provided extending through the at least one blade from the pressure surface to the suction surface, the duct openings being grouped in the tip region of the blade.

There is provided mechanisms for controlling movement of a propeller shaft on a vessel. A controller includes processing circuitry. The processing circuitry is configured to cause the controller to detect movement of the propeller shaft by determining a signature of a sustained oscillation of the propeller shaft. The processing circuitry is configured to cause the controller to control movement of the propeller shaft according to the determined signature.

There is provided mechanisms for controlling movement of a propeller shaft on a vessel. A controller includes processing circuitry. The processing circuitry is configured to cause the controller to detect movement of the propeller shaft by determining a signature of a sustained oscillation of the propeller shaft. The processing circuitry is configured to cause the controller to control movement of the propeller shaft according to the determined signature.

A system for cutting marine grasses, weeds and other plant life to protect a propeller drive watercraft is disclosed. An adjustable, protective cutting edge to protect a propeller, drive shaft of a boat or other watercraft motor is further disclosed. A propeller protection device to mount upon a watercraft is further disclosed for optimizing the navigation of watercraft and reducing in-piloting maintenance of clearing plant matter from a propeller of a watercraft.

A peller device with a flap is an apparatus used to enhance the capabilities and efficiency of water circulation and aeration systems. The apparatus is configured to act as both a propeller and an impeller as necessary for a particular water circulation requirement. A flap is an addition to the blade tip which propels a fluid by pushing against the fluid, thus enabling the peller to function as a propeller. In addition, the flap facilitates the generation of a sucking force so the peller can also function efficiently as an impeller. The peller assembly can be encased in circular housings having a vertical axis in which the peller assembly is mounted for rotation on the central axis of the housing. The peller assembly is formed with a hub and a plurality of blades symmetrically positioned around the hub. The flap of the apparatus is attached to the base of the peller assembly.

A peller device with a flap is an apparatus used to enhance the capabilities and efficiency of water circulation and aeration systems. The apparatus is configured to act as both a propeller and an impeller as necessary for a particular water circulation requirement. A flap is an addition to the blade tip which propels a fluid by pushing against the fluid, thus enabling the peller to function as a propeller. In addition, the flap facilitates the generation of a sucking force so the peller can also function efficiently as an impeller. The peller assembly can be encased in circular housings having a vertical axis in which the peller assembly is mounted for rotation on the central axis of the housing. The peller assembly is formed with a hub and a plurality of blades symmetrically positioned around the hub. The flap of the apparatus is attached to the base of the peller assembly.