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Hull speed or displacement speed is the speed at which the wavelength of a vessel's bow wave is equal to the waterline length of the vessel. As boat speed increases from rest, the wavelength of the bow wave increases, and usually its crest-to-trough dimension (height) increases as well. When hull speed is exceeded, a vessel in displacement mode ...
Herreshoff Manufacturing, Beetle Boat Co., Paceship Yachts, Whitecap Composites [162] Thistle (dinghy) 1945: Sandy Douglass: Douglass & McLeod Clark Boat Company W. D. Schock Corp Northwest One Design Great Midwest Yacht Company [163] Transit 380: 2005: Jim Taylor: Precision Boat Works [164] Twitchell 12: 1991: Ron Holder: W. D. Schock Corp ...
The process of determining the PHRF for an individual boat begins with the regional PHRF rating, then adjustments are made for the individual attributes of the boat such as: modifications to the rig, the size of the largest foresail (jib or genoa), the size of the spinnakers, type of keel (full, fin, wing etc.), the number of blades on the propeller, and the style of the propeller (fixed ...
A gaff cutter, Kleine Freiheit, with a genoa jib set USCGC Legare, an example of a US Coast Guard cutter A cutter is any of various types of watercraft.The term can refer to the rig (sail plan) of a sailing vessel (but with regional differences in definition), to a governmental enforcement agency vessel (such as a coast guard or border force cutter), to a type of ship's boat which can be used ...
The boat has a hull speed of 6.54 kn (12.11 km/h). [2] See also. List of sailing boat types; References This page was last edited on 21 June ...
Forward resistance comprises the types of drag that impede a sailboat's speed through water (or an ice boat's speed over the surface) include components of parasitic drag, consisting primarily of form drag, which arises because of the shape of the hull, and skin friction, which arises from the friction of the water (for boats) or air (for ice ...
The hull’s very mild "V" bottom and hard chine make Sunfish a most stable boat for its size, along with enabling it to sail on a plane (hydroplane). Planing allows the boat achieve a speed greater than theoretical hull speed based on length at waterline . Having a down-wind performance advantage helps the Sunfish achieve a planing attitude at ...
This nomenclature dates back to the days of sail, when sailors attached a piece of lumber (a "log" of wood) to a rope knotted at regular intervals off the stern of a ship. Sailors counted the number of knots that passed through their hands in a given time to determine the ship's speed. Today, sailors and aircraft pilots still express speed in ...