[C320-list] Weight of a 320

[Greg Flanagan]

Following the Wikipedia article:

“When any boat displaces a weight of water equal to its own weight, it floats. This is often called the "principle of flotation": A floating object displaces a weight of fluid equal to its own weight. Every ship, submarine, and dirigible must be designed to displace a weight of fluid at least equal to its own weight. A 10,000-ton ship's hull must be built wide enough, long enough and deep enough to displace 10,000 tons of water and still have some hull above the water to prevent it from sinking. It needs extra hull to fight waves that would otherwise fill it and, by increasing its mass, cause it to submerge.”

It seems pretty clear that a (floating) boat displacement mass equals its weight (mass). 😊

The problem in practice is that a factory stated displacement doesn’t include all the fluids,  junk we add to the boat, and the people on it. 

Cheers,

Greg 

> On Jun 13, 2018, at 12:09 PM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> 
> Nope!
> If it floats it displaces the same weight (strictly, MASS)  of water as it’s own mass but less VOLUME of water than its own volume
> 
> If it is neutrally buoyant then mass and volume of both are the same
> 
> If it sinks then volume of water displaced is same as object but mass of water is less than mass of object
> 
> ISTBC!
> 
> Graeme
> 
> 
> Sent from mobile: please excuse typos etc.!
> 
> 
>> On 13 Jun 2018, at 19:23, ptormey at 4square.net wrote:
>> 
>> Yep that's called Archimedes Principle.
>> It's funny story of the king's gold and the displacement of the crown in water.
>> 
>> https://en.wikipedia.org/wiki/Archimedes%27_principle
>> 
>> --------- Original Message --------- Subject: Re: [C320-list] Weight of a 320
>> From: "Don Brereton" <yachtman165 at comcast.net>
>> Date: 6/13/18 1:22 pm
>> To: C320-List at Catalina320.com
>> 
>> Any object or in this case a boat must displace more than it weighs or it will sink I believe.
>> 
>> Sent from my iPhone
>> 
>>> On Jun 12, 2018, at 9:03 PM, Greg Flanagan <greg.flanagan at shaw.ca> wrote:
>>> 
>>> I am confused: “Displacement is the volume of water displaced when the vessel is freely floating and such volume will equal the total weight of the boat and all items thereon at that time. It is a direct relation to overall weight.”
>>> 
>>> Thanks,
>>> 
>>> Greg 
>>> Hoop Dancer #1076
>>> Sidney, BC
>>> 
>>>> On Jun 12, 2018, at 12:45 PM, John Morrison <sail-ability at sympatico.ca> wrote:
>>>> 
>>>> My 1999#574 clicks in at 12700lb. 
>>>> JEM 1999#574
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>>> On Jun 12, 2018, at 1:23 AM, Tony Belton <tbelton at gwrr.com> wrote:
>>>>> 
>>>>> Hi All,
>>>>> I'm the owner of hull 251, Shilo, located in Adelaide, South Australia. We cruise her around the local gulf waters and race in our club's twilight series. In our first year of owning Shilo we clocked up 1100 n/miles.
>>>>> Has anyone had reason to weigh their 320? I know the displacement but interested to know the weight.
>>>>> 
>>>>> Regards,
>>>>> Tony
>>>>> 
>>>>> Tony Belton | Transport Controller
>>>>> Genesee & Wyoming Australia Pty Ltd
>>>>> 1 Kidman Rd Dry Creek | PO Box 309, Marleston DC SA 5033
>>>>> Email: tbelton at gwrr.com<mailto:tbelton at gwrr.com> | Direct: +61 8 8343 7606 | Fax: +61 8 8343 7335
>>>>> Website: www.gwrr.com<http://www.gwrr.com/>
>>>>> If you are not the intended recipient of this email please advise the sender and destroy immediately
>>>>> 
>