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Whirligig store. A whirligig is an object that spins or whirls, or has at least one part that spins or whirls. It can also be a pinwheel, spinning top, buzzer, comic weathervane, gee-haw, spinner, whirlygig, whirlijig, whirlyjig, whirlybird, or simply a whirly.
2. (folding) A propeller with folding blades, furling to reduce drag on a sailing vessel when not in use. propeller walk. Also prop walk. The tendency for a propeller to push the stern sideways. In theory, a right-hand propeller in reverse will walk the stern to port. prow 1. The forwardmost part of a vessel's bow above her waterline. 2.
The extremity of the arm of an anchor; the point of or beyond the fluke. billethead 1. On smaller vessels, a smaller, non-figural carving, most often a curl of foliage, might be substituted for a figurehead. 2. A round piece of timber at the bow or stern of a whaleboat, around which the harpoon line is run out when the whale darts off. Bimini top
English inventor Francis Ronalds described what he called a propelling rudder in 1859 that combined the propulsion and steering mechanisms of a boat in a single apparatus. . The propeller was placed in a frame having an outer profile similar to a rudder and attached to a vertical shaft that allowed the device to rotate in plane while spin was transmitted to the propell
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A more serious problem with this type of propeller is a "frozen-on" spline bushing, which makes propeller removal impossible. In such cases the propeller must be heated in order to deliberately destroy the rubber insert. Once the propeller is removed, the splined tube can be cut away with a grinder and a new spline bushing is then required.
The Rotating Arm facility [3] measures the rotary derivatives Yr and Nr on the model, in a special type of towing tank and apparatus called a rotating-arm facility. In this facility, an angular velocity is imposed on the model by fixing it to the end of a radial arm and rotating the arm about a vertical axis fixed in the tank.
Rim–driven thruster, presented at SMM 2010 A rim-driven thruster mounted on a swing-out unit (design by silentdynamics GmbH) Voith rim thruster at SMM 2010 in Hamburg. The rim-driven thruster, also known as rim-driven propulsor/propeller (or RDP) is a novel type of electric propulsion unit for ships.