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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 ...
An example would be a light displacement, planing hull versus a heavy displacement non-planing hull. To mitigate this, as with other rating systems, PHRF suggests that race organizers assign boats with similar design in their fleet divisions. This reduces the planing boat vs heavy displacement variable.
brand is the brand the boat is being marked under. Example Oceansail: String: optional: builder: builder: builder are the notable builders. Wikidata P176. Example Oceanic Boat Company Inc. String: suggested: role: role: role is what the sailboat is used for be it a youth trainer, offshore racer, recreational sailing etc.. Example Offshore Racer ...
In particular, any "displacement" or non-planing boat requires much greater power to accelerate beyond its hull speed, which is determined by the length of the waterline, and can be calculated using the formula: Vmax (in knots) = square root of LWL (in feet) x 1.34. The hull speed is the speed at which the wavelength of the bow wave stretches ...
The Cruising Club of America (CCA) put together a technical committee that analyzed race boat data. They came up with the formula to compare boats based on readily available data. The CCA characterizes the formula as "rough". A lower value is supposed to indicate a sailboat is less likely to capsize. A value of 2 is taken as a cutoff for ...
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 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 ...
The boat is normally fitted with a small outboard motor for docking and maneuvering. [1] [4] The design has a PHRF racing average handicap of 189 with the swing keel or the fin keel and 195 with the wing keel. [7] The boat has a hull speed of 6.03 kn (11.17 km/h). [2] [4]