bouyancy = flotation???

[ocean goin]

what is the rec ipe for 1lb of bouyancy will hold up how much weight?????

 

[crab bait]

Re: bouyancy = flotation???

don't know.. but one cubic foot of foam is 65 lbs.. i think... tommorow i'll check. the book is in my shop..

 

[KenOhki]

Re: bouyancy = flotation???

Im not sure it works that way. boyancy is based on displacement. The way I understand it. for the sake of argument, say this 1 pound piece of boyancy was a 1 foot square. it would displace roughly 7 gallons of water. a galon of water is roughly 8 pounds, so 7x8=56. So, your float would displace 56 pounds of water and should make 56 pounds ( float weight included ) neutraly boyant, and allow it to float less then 56 pounds above water. actualy, I think 1 cubic foot holds 7.4 gallons so I could be off just a little bit here, but you should now understand how to figure it out based on float size( displacement)not float weight.<br /><br />If Im wrong im sure somebody will jump on me, But im pretty sure I got this one nailed on the head<br /><br />hope this helps

 

[skiffer]

Re: bouyancy = flotation???

Archimedes (Ancient Greek) said buoyancy provided by a volume equals the weight of the fluid displaced. Not surprisingly, we call this Archimedes Principle.<br /><br />Sea water weighs 64.5 lbs/cubic foot so one cubic foot of volume would support 64.5 pounds of weight. If the cubic foot of buoyancy volume was filled with a cubic foot of foam weighing, say 2 pounds, then we have to deduct the weight of the foam and it would support 64.5 - 2 = 62.5 pounds. <br /><br />A cubic foot is the volume of a cube one foot on each side. One rarely has a perfect cube, so you have to calculate the volume of the floatation material you're dealing with then multiply by the density of the water (62.5 lbs/cubic foot for sea water) minus the density of the foam, or whatever material you're dealing with.<br /><br />As an example, the volume of a surf board that was say 6 inches (1/2 foot) thick by 3 feet wide by 6 feet long would be 1/2x3x6=9 cubic feet. This would support a weight of 9x64.5=580 pounds minus the weight of the board in sea water.<br /><br />Ancient Greeks were pretty smart, they figured this stuff out more than 2000 years ago. Maybe they just had a lot of time on their hands.

 

[crab bait]

Re: bouyancy = flotation???

if'n they be so smart ,,, how come it took americans to invent styofoam...

 

[skiffer]

Re: bouyancy = flotation???

It was invented by Styofoamius in 867 BC.<br /><br />It was used a few hundred years later by Noah to fill the Ark with flotation in order to comply with Ancient Greek Coast Guard regulations.<br /><br />Noah also had one helluva time finding 2 Type I flotation devices for the elephants.

 

[akriverrat]

Re: bouyancy = flotation???

1 pound of bouancy is provided by whatever amount of material used that is less dense than water and will support 1 pound applied to it. a pfd made out of oil filled bags would need to be much larger than air filled bags to provide the 14 pounds bouyancy required. 14 lb may not be right but it is close for adult type II. 1 lb of buoancy will support one lb and itself. i am tired i left work at noon and went boating. i am probably way off base and totally misunderstood question.