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[coming back to this after a little time away from email...]
norm's main point, that it's the boat's windage and not its weight that
matters, is correct (assuming a flat sea?). the mass isn't going
anywhere unless something pushes it. granted, bigger boats also tend to
present more area, but that's a function of design, not mass. i said
'far too heavy' when i should have said 'far too big'. still though, i
think mass in combination with buoyancy would come into play if waves
are involved, and as our marina isn't well-protected from NE winds,
i've seen 4 - 5 foot waves come rolling into the docks under the right
conditions (the most recent storm had winds from S to WNW).
while it's true the dock and pilings didn't sustain any visible damage
from the storm, i'm reluctant to trust the judgment of the marina owner
who says "oh, it'll hold your boat fine!", when the lines he'd tied the
larger boat up with parted (this is the boat owner's first boat, so
he's looking to the marina owner). another factor i didn't mention
previously: the boat that was there before the large yacht, was smaller
than my boat, and broke away twice in storms. further, when my boat
first arrived at the marina, i was shown to a different side tie, and
my boat ripped a cleat and plank off the dock a few nights later during
a moderate blow. so, perhaps you can now appreciate my sensitivity
toward hearing "your boat needs to move..."
thanks to those of you who responded offlist with more pragmatic and
less mechanical advice; after presenting my case to the marina owner,
he became far more reasonable, and i don't have swap slips with the
megayacht after all, he chose another victim.
On Sunday, November 24, 2002, at 04:06 PM, David Vrona wrote:
> Since you attempted to provide a lesson in physics here let me correct
> your formula. Translational kinetic energy is 1/2 * m * V^2
>
> Although your calculations are correct, that example may or may not
> have any relevance to the boats his marina.
>
> My original argument was that you cannot just dismiss the boat mass.
>
>
> --On Sunday, November 24, 2002 12:08 PM -0500 ""
> <> wrote:
>
>> In a message dated 11/17/02 9:17:24 AM Eastern Standard Time,
>> writes:
>>
>>> I don't agree. What about the momentum of the boat? That is a
>>> function
>>> of the mass.
>>
>>
>> The energy in a moving object is mass times velocity squared. If
>> there
>> are two boats with the same windage and the boat A weighs four times
>> as
>> much as boat B then boat A will move half as fast as boat B when a
>> gust
>> of wind hits each boat. Each boat will have the same energy in it
>> and
>> the same force to dissipate in the dock lines and dock when arriving
>> at
>> the end of their tether.
>>
>> Norm
>>
>
>
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