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From: Mike Maurice (no email)
Date: Mon Feb 04 2008 - 13:42:46 EST
> Critics will say the extra weight aloft will affect handling. Nonsense. A
> 40,000 pound vessel is not affected by the weight of 800 pounds per tank,
> especially if you balance the weight out by putting two tanks, one on each
> side. Again, they make great seats and can be enclosed with an attractive
> cover. Martin Veiner
>
Nonsense, maybe. But, the reality can't be dismissed quite so easily.
The change in moment is about 4000 pounds, one foot above the center of
gravity (CG); per tank ( 800 x 5 feet). The center of the tank being
about 5 feet above CG; at least 5 feet, maybe 6 or 7. If it's 7 feet,
make that 5600 pounds of moment, per tank.
The destabilizing effect is about that of 5 people sitting on the cabin
top. There is also the torque effect on the cabin sides and framing.
All these numbers don't mean too much at the dock or in calm water. But,
if you ever get into rough conditions, they will have a big impact. And
the torque effect will be magnified as well. I recall a 50' steel boat a
couple of years ago where the previous owner had mounted a 1000 pound
dinghy on the cabin top. No reinforcement had been installed to support
the cabin top and there was visible cracking of the supports.
There is nothing wrong with a little corner cutting, as long as you know
accurately what you are cutting.
Regards,
Mike
_____________________________________
Capt. Mike Maurice
Beaverton Oregon(Near Portland)
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