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 Post subject: Re: Life Jacket
PostPosted: Thu Sep 29, 2011 1:25 am 
Part of the furniture
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Joined: Sun Sep 26, 2010 11:40 pm
Posts: 400
Location: Seattle, Washington
The 275N rating is not a buoyancy rating per se, but actually a classification of life jacket. In the states, we use the Type I, II, III, etc rating, but I guess the UK uses the 100N, 150N, 275N rating. The 275 rating seems to be the equivalent of the US Type I jacket, which is according to Mustang Survival "PFDs, or offshore lifejackets, are the most buoyant PFDs and suitable for all water conditions, including rough or isolated water where rescue may be delayed. Although bulky in comparison to Type II and III PFDs, offshore jackets will turn most unconscious individuals to the face-up position. They range in sizes from adult to child."

There should be a separate buoyancy rating for the jacket which tells you how much added buoyancy it provides and the maximum weight.

-Vic

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 Post subject: Re: Life Jacket
PostPosted: Sat Oct 08, 2011 10:25 am 
Quite OK actually
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Joined: Tue Nov 02, 2010 4:46 pm
Posts: 198
Location: Luxembourg
Couldn't it be that it is 275newton?

That would be N=m x g which is on earth g=9.81m/s*2

So 275N/9.81m/s*2

So that would be 28kg.

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 Post subject: Re: Life Jacket
PostPosted: Sun Oct 09, 2011 7:49 am 
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Yes actually it is Newton and yes it is 28kg (easiest is 10N = 1kg). And it isn't that 275N can only give buoyancy to a 28kg (61.6 lbs) heavy person, but is the force/weight needed to turn a person over in the face up position (by ISO standard). Buoyancy and the ability of turning a person over has a lot to do too with what is being worn, salt water or sweet water, weather conditions, etc, etc. Furthermore one should not forget that the weight in air is different from the weight in air (submerged in water weight loss = object in air/specific gravity). Furthermore you may want to get a refresher in your water drills, cause you should know what to do with your kit (60kg) when in water. ;)

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