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Human-powered watercraft are watercraft propelled only by human power, instead of being propelled by wind power (via one or more sails) or an engine . The three main methods of exerting human power are: directly from the hands or feet, sometimes aided by swimfins; through hand-operated oars, paddles, or poles, or; through the feet with pedals ...
A Z-drive is a type of marine propulsion unit. Specifically, it is an azimuth thruster. The pod can rotate 360 degrees allowing for rapid changes in thrust direction and thus vessel direction. This eliminates the need for a conventional rudder. The Z-drive is so named because of the appearance (in cross section) of the mechanical driveshaft or ...
Typically, kayak design is largely a matter of trade-offs: directional stability ("tracking") vs maneuverability; stability vs speed; and primary vs secondary stability. Multihull kayaks face a different set of trade-offs. The paddler's body shape and size is an integral part of the structure, and will also affect the trade-offs made.
— Cons: Weighing in at more than 100 pounds before the pedal drive system and seat are installed, this kayak is incredibly heavy and can only be transported in the back of a truck or on a trailer.
The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...
Marine propulsion. Rolls-Royce Marine Spey, a gas turbine developed by Rolls-Royce Holdings in the 1960s for marine propulsion. Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats, most modern ships are propelled by mechanical ...
Two U.S. Marines of the Maritime Special Purpose Force operating a Diver Propulsion Device (DPD) Two divers scootering with heavy duty DPVs. A diver propulsion vehicle (DPV), also known as an underwater propulsion vehicle, sea scooter, [1] underwater scooter, or swimmer delivery vehicle (SDV) by armed forces, is an item of diving equipment used by scuba divers to increase range underwater.
The first working full-scale MHD ship. A magnetohydrodynamic drive or MHD accelerator is a method for propelling vehicles using only electric and magnetic fields with no moving parts, accelerating an electrically conductive propellant (liquid or gas) with magnetohydrodynamics. The fluid is directed to the rear and as a reaction, the vehicle ...
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