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8 motions of the oar in rower's hands. In water the oar moves much like a propeller.(bow at the top)Stern sculling is the process of propelling a watercraft by moving a single, stern-mounted oar from side to side while changing the angle of the blade so as to generate forward thrust on both strokes.
Root Berths easily roll up for storage. Some use heavy wooden dowels instead of pipes, again fitting into brackets when in use. Some boats provide multiple bracket options, so the canvas can be pulled tight like in a pipe berth, or left looser for a more "hammock-like" berth, helpful in heeling boats or heavy seas.
When the boat has more than one rower, the rower closest to the stern of the boat is referred to as "stroke". This is the most important position in the boat, because the stroke rower sets the stroke rate and rhythm for the rest of the crew to follow. Stroke seat has to be a very calm and yet very competitive individual.
A narrower boat provides a sharper angle to the bow and a smaller cross-sectional area reducing drag and wave drag, and avoiding hull speed limitations at race speed. The first racing shells, while narrower than working rowboats, were limited by the width necessary to mount the oarlocks on the boat's sides ("gunwales").
Boat building is the design and construction of boats (instead of the larger ships) — and their on-board systems. This includes at minimum the construction of a hull , with any necessary propulsion, mechanical, navigation, safety and other service systems as the craft requires.
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Illustration of a simple three-axis gimbal set; the center ring can be vertically fixed. A gimbal is a pivoted support that permits rotation of an object about an axis. A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow an object mounted on the innermost gimbal to remain independent of the rotation of its support (e.g. vertical in the first ...
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