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Author Topic:   320 Outrage flotation
TightlinesPE posted 07-31-2005 12:14 PM ET (US)   Profile for TightlinesPE   Send Email to TightlinesPE  
In the 320 Outrage, it has a 4300 lb. swamped capacity ( I believe). What exactly does this mean?

If this boat gets swamped, it should float upright because of the foam to the gunnels as I understand, but will the powerheads stay above water so the boat can be moved to drain the water?

Thanks in advance for the input.

prm1177 posted 07-31-2005 02:04 PM ET (US)     Profile for prm1177  Send Email to prm1177     
From a Whaler catalogue:

Swamped capacity is the weight the boat can hold when completely full of water (defined as water to the gunnels). In most of the instances, the powerhead of the motor will still be above calm water. Note that the swamped capacity includes the weight of gear, people, and motor.

As for floating upright, this depends on sea conditions. A Whaler may not sink, but it is perfectly capable of capsizing if the conditions are correct. Every boat, with the exception of self-righting lifeboats, can capsize.

jimh posted 07-31-2005 05:00 PM ET (US)     Profile for jimh  Send Email to jimh     
Wherever Boston Whaler has printed a specification for swamped capacity they generally include a definition of it. Typically the swamped capacity represents how much reservoir buoyancy is in the hull form.

The hull does not float because there is foam inside it. The hull floats because its weight and the combined weight of all the gear, passengers, and water inside it are less than the water it is displacing. There could be kryptonite in the hull and it would still float, as long as the volume of water displaced by the hull was greater than the weight of the hull and its contents, which in the case of a swamped boat, includes a great deal of weigh from water in the cockpit and other interior spaces of the boat.

By filling up much of the hull volume with foam, water is precluded from occupying this space when the hull is swamped. Therefore the hull cannot fill this portion of its volume with water. This is the reason the hull will still float even if the cockpit is filled with water. The hull could be similarly filled with air in those spaces, and it would have even more buoyancy, however it would not be as strong nor would it likely to remain tightly sealed forever.

Swamped capacity is the amount of additional weight that must be added to the hull when the cockpit is filled with water to bring the gunwales to the waterline.

When any boat is swamped it will have problems with instability because the water in the boat will move freely about which results in large shifts in the center of gravity of the boat. As noted, the design of the Boston Whaler boat has so much reserve buoyancy that even with the cockpit filled with water there will be considerable load carrying capacity remaining in the hull form buoyancy. Generally this will be sufficient that the transom will not be immersed to the point of burying the outboard engine powerhead.

TightlinesPE posted 07-31-2005 06:53 PM ET (US)     Profile for TightlinesPE  Send Email to TightlinesPE     
Great info! That's something good to know when you're not happy with the performance of your boat! Now I wish BW would come up with a 60 mph efficient and good riding hull like a Fountain...that would pretty much complete my boating needs...

bsmotril posted 07-31-2005 09:42 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
When you look at a Fountain, Contender, or Intrepid against a Whaler, you're comparing apples to oranges. The construction methog Whaler uses will never be as light as the high tech light weight composites in the boats I mentioned above. Even with a more efficient hull shape, a Whaler with the same horsepower and length will not go as fast as one of the SKA boats because the foam core hul will aways weigh more. BillS
TightlinesPE posted 07-31-2005 09:54 PM ET (US)     Profile for TightlinesPE  Send Email to TightlinesPE     
So I guess it's all weight we're talking about here...
BOB KEMMLER JR posted 07-31-2005 10:38 PM ET (US)     Profile for BOB KEMMLER JR    
weight and quality ;o)
diveorfish posted 08-01-2005 06:27 PM ET (US)     Profile for diveorfish  Send Email to diveorfish     
TightlinesPE: Here is a hypothetical swamping scenario for my Whaler:

My 23 Outrage has a swamped capacity of 4,900 lbs if I remember correctly. Engines weigh about 900 lbs so I will say a swamped capacity of 4,000 lbs of people and gear.

If my boat will support 4000 lbs. of weight when swamped, what happens if I only have about 400 lbs. (two average fishermen) to support?

If I take some huge wave over the bow and a big gush of water comes in and somehow fills the boat up to the gunwales. Instead of sinking, the boat would immediately start draining until the 3,600 lbs of reserve buoyancy could be compensated for, which is about 470 gallons of water.

As the water drains out, the boat gains even more buoyancy then even more water drains out of the transom door opening and then the scuppers.

The draining would continue until the water above deck is gone and you are out of trouble. The only water left would be in the bilge and in the bottom of the console which would be pumped out in about 15 minutes.

In the mean time, the motors remain out of the water and keep running enabling you to get underway immediately and avoid further trouble.

In this scenario, what would sink virtually any other boat would only inconvenience the Whaler driver for about 15 minutes.

Pit this scenario against a few mph of top end. This is the reason most of us wanted Whalers. That’s why the Coast Guard, Navy and Marines tend to want them too.

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