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Old 19-12-2010, 23:27   #1
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Hull Speed when Heeling ?

I was looking at photos of various sailboat and wondered how terminal hull speed was calculated...its clear that some boats with a short water ligne gain a foot or more when on an angle...my boat in particular seems to have a longer water ligne when healing...whould this mean a faster speed?
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Old 20-12-2010, 00:00   #2
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the hull speed formula (square root x waterline length X 1.34) is at best approx.
narrow boats will go slightly faster, wider boats slower.
It is just a rough quide and thats all.

My the way I wrote to dany, but did not get a reply?
I really would like to contact his brother in Meurake.

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Beau
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Old 20-12-2010, 00:15   #3
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Trawlers can usually make hull speed regardless of the winds.
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Old 20-12-2010, 00:19   #4
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If I understand it right long overhangs were the most effective response to the old CCA design rule that favored a shorter waterline legnth.
Better standing for a boat with a shorter waterline length, a boat that when heeled over could lengthen dramatically, adding to it's hull speed. Bill Tripp worked that angle very successfully. Makes for a very pretty boat as well.

Angle of heel should be considered (along with ballast weight, displacement) a hull design element. After a certain degree of heel speed is lost. Different boats have different (slightly?) sweet spots this way. Sailing will tell where your is. I think on my Challenger I started losing efficiency/speed after 20 degrees or so. On our old LeCompte it was a bit deeper.
This is why some folks invest in a clinometer.
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Old 20-12-2010, 04:15   #5
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Quote:
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the hull speed formula (square root x waterline length X 1.34) is at best approx.
And if you want to find your maximum LWL under sail, just record your speed through the water and work the formula backwards...
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Old 20-12-2010, 05:15   #6
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Quote:
Originally Posted by beau View Post
the hull speed formula (square root x waterline length X 1.34) is at best approx.
narrow boats will go slightly faster, wider boats slower.
It is just a rough quide and thats all.

My the way I wrote to dany, but did not get a reply?
I really would like to contact his brother in Meurake.

Regards,
Beau
Danny is almost always at sea...he voyages all over malaysia and indonesia to collect animals for the pet trade...this time of year hes probably in the salomons??
he will get back to you when it is possible for him to do so...hopefully soon
Rgds
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Old 21-12-2010, 13:06   #7
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How efffective overhangs are on adding to sailing length depends upon the shape of the overhang.
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