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Trolling motors calibrate speed more accurately than large outboard motors. Trolling plates are also used with larger motors to slow the boat to the desired speed, although some anglers experience mixed results with plates. [citation needed] Trolling can be effective at surprisingly low speeds.
Basic parts of an outboard motor. An outboard motor is a propulsion system for boats, consisting of a self-contained unit that includes engine, gearbox and propeller or jet drive, designed to be affixed to the outside of the transom. They are the most common motorised method of propelling small watercraft.
A Stewart platform is a type of parallel manipulator that has six prismatic actuators, commonly hydraulic jacks or electric linear actuators, attached in pairs to three positions on the platform's baseplate, crossing over to three mounting points on a top plate.
Hydraulic cylinder; Hydraulic motor (a pump plumbed in reverse); hydraulic motors with axial configuration use swashplates for highly accurate control and also in 'no stop' continuous (360°) precision positioning mechanisms. These are frequently driven by several hydraulic pistons acting in sequence.
Modern jacking systems use a rack and pinion gear arrangement [7] where the pinion gears are driven by hydraulic or electric motors and the rack is affixed to the legs. [citation needed] Jackup rigs can only be placed in relatively shallow waters, generally less than 120 metres (390 ft) of water.
Plates, similar to rudders, can be attached to the nozzle in order to redirect the water flow port and starboard. In a way, this is similar to the principles of air thrust vectoring , a technique which has long been used in launch vehicles (rockets and missiles) then later in military jet-powered aircraft.
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