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Old 05-03-2016, 06:16   #46
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Re: At anchor

it helps to have a 6'6" depth in a 5 ft depth.... lol.... and a 2.5 ft wide keel base and lovely wine glass hull.... heart shaped transom.....
rodl. weight matters.

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Old 06-03-2016, 21:20   #47
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Re: At anchor

Anybody have experience with the Brewers 12.8, (also the Whitbys 42). Comfy?

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Old 21-03-2016, 22:36   #48
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Re: At anchor

How about the amount of water in the tanks? That will dampen out the roll.

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Old 22-03-2016, 18:00   #49
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Re: At anchor

Originally Posted by Ocean Girl View Post
Anybody have experience with the Brewers 12.8, (also the Whitbys 42). Comfy?
No idea about the Brewer, but one of our friends who had the Whitby 42 used to complain how rolly it was when we were in the Solomons together. Our boat (the first Insatiable*) was quite wide amidships, lots of form stability, and we had not noticed it was rolly at all.


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Old 23-03-2016, 23:01   #50
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Re: At anchor

Originally Posted by Don C L View Post
Resonant frequency. Hulls respond to waves at a certain frequency. Different hulls, different frequencies.
Exactly, rolling is a resonance phenomenon and usually the extent of the roll depends on how close to the transvers natural frequency of the boat the waves are.

Whether and how much rolling occurs tends to depend on how much damping is inherent in the system. I have noticed that whilst sailing down wind I can sometimes stop the boat from taking up excessive roll by shifting my weight from foot to foot counter to the roll.

Oil drillers originally went into deep water offshore using ships and barges, heave and rolling was a problem because they make the work more difficult. To solve the problem they built semi submersible drill rigs which distribute the buoyance over a number of water planes in the columns spread widely apart. Since the support columns and lower hulls are generally full of water when they are ballasted down there is a large mass and distributed impetus consequently little heave or roll.

However, when the wave period, even though the wave heights are almost unnoticeable, match the resonant period of heave of the semi, as has occurred off the Western Australian coast, the heave can become massive. In one instance 28 feet on what looked like a very calm day.

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