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arvey

hull speed

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tbayboy

Hull speed is the maximum practical speed of a displacement (non-planing) hull. Since a wave's length is proportional to the square of its speed, the wave created by a moving hull will at some speed become longer than the hull's waterline. At this speed the stern of the craft will no longer be supported by any of the following wave crests. You will feel the stern squat into the trough following the bow wave. You will also notice that far greater paddling effort yields little increase in speed because to go faster you must now, in addition to the other forms of resistance, also work against gravity to climb out of the trough.

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How is hull speed calculated? (or is it measured?)

The formula for the speed of a water wave, 1.34 times the square root of the wavelength (in feet) equals the speed (in knots), is often used, by substituting the crafts waterline length for wave length, to calculate theoretical "hull speed". In reality many other factors including weight, slenderness, and the fullness of the bow and stern are also involved.

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GC 54

Hope this explains it for you Al:

http://www.sailingusa.info/cal__hull_speed.htm


George Clark of TEAM CLARK

FIELD STAFF FOR TEAM SHIMANO PRO STAFF FOR D & R SPORTING GOODS PRO STAFF FOR LUND BOATS
Proudly Supported By: G.LOOMIS JACKALL POWER PRO NORTH COUNTRY CYCLE & SPORTS Treasurer of: Thunder Bay BASSmasters

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Bear
Hull speed is the maximum practical speed of a displacement (non-planing) hull. Since a wave's length is proportional to the square of its speed, the wave created by a moving hull will at some speed become longer than the hull's waterline. At this speed the stern of the craft will no longer be supported by any of the following wave crests. You will feel the stern squat into the trough following the bow wave. You will also notice that far greater paddling effort yields little increase in speed because to go faster you must now, in addition to the other forms of resistance, also work against gravity to climb out of the trough.

Back to FAQ Index

How is hull speed calculated? (or is it measured?)

The formula for the speed of a water wave, 1.34 times the square root of the wavelength (in feet) equals the speed (in knots), is often used, by substituting the crafts waterline length for wave length, to calculate theoretical "hull speed". In reality many other factors including weight, slenderness, and the fullness of the bow and stern are also involved.

Holy snapping. Thats enough to make my lobes throb. Put on some foil.

BB

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GC 54

Now we know what it is, who cares?

Bear, ....Putting On The Foil...., I seen the movie that line comes from as well, a couple of times actually.


George Clark of TEAM CLARK

FIELD STAFF FOR TEAM SHIMANO PRO STAFF FOR D & R SPORTING GOODS PRO STAFF FOR LUND BOATS
Proudly Supported By: G.LOOMIS JACKALL POWER PRO NORTH COUNTRY CYCLE & SPORTS Treasurer of: Thunder Bay BASSmasters

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