basskisser wrote:

Peggie Hall wrote in message ...

Calif Bill wrote:

Water is 64# per cubic foot.


Water is 64# per cubic foot.

How'd you arrive at that? 'Cuz I'm driving myself nuts here trying to
convert lbs/gal (8.333) to lbs/cu.ft. and it's not working.


Bill, I think, is using the weight of salt water, which is 64# per
square foot, but close enough. Fresh PURE water is 62.5 pounds per
cubic foot, and there are 7.5 gallons per cubic foot.
(8.33333x7.5)=62.5 (rounded!)


You meant, of course, 64 pounds a cubic foot for salt water, not a
square foot. All these cubes and squares...

Harry Krause wrote in message ...
basskisser wrote:

Peggie Hall wrote in message ...

Calif Bill wrote:

Water is 64# per cubic foot.


Water is 64# per cubic foot.

How'd you arrive at that? 'Cuz I'm driving myself nuts here trying to
convert lbs/gal (8.333) to lbs/cu.ft. and it's not working.


Bill, I think, is using the weight of salt water, which is 64# per
square foot, but close enough. Fresh PURE water is 62.5 pounds per
cubic foot, and there are 7.5 gallons per cubic foot.
(8.33333x7.5)=62.5 (rounded!)


You meant, of course, 64 pounds a cubic foot for salt water, not a
square foot. All these cubes and squares...

Yup, shouldn't use math so early in the morning.

Harry Krause wrote:

basskisser wrote:

Peggie Hall wrote in message
...

Calif Bill wrote:

Water is 64# per cubic foot.



Water is 64# per cubic foot.

How'd you arrive at that? 'Cuz I'm driving myself nuts here trying to
convert lbs/gal (8.333) to lbs/cu.ft. and it's not working.



Bill, I think, is using the weight of salt water, which is 64# per
square foot, but close enough. Fresh PURE water is 62.5 pounds per
cubic foot, and there are 7.5 gallons per cubic foot.
(8.33333x7.5)=62.5 (rounded!)



You meant, of course, 64 pounds a cubic foot for salt water, not a
square foot. All these cubes and squares...

Why bother?

A 75 kg load needs 75 one liter milk cartons, not counting the
weight of the cartons and tape.

Close enough!

So, How heavy is the load plus the vehicle?

Ahh, boat design, so simple, so elegant.

I want to make closed cell urothane foam cushions for my cockpit,
maybe 2" thick. The cusions would velcro together to make a dinghy.
It don't matter if it leaks, it'll be self bailing. With a drop
board for a keel and an umberella, it'll do for fishing expeditions
to "the surface", kind of like a little shuttlecraft.

Terry K

There is a resource for everything on the web...

http://www.milkcartonboat.com/links.htm

(areuKIDDINGme) wrote in message . com...
Our assignment is to create a boat made out of solely milk cartons and
duc tape. With unlimited amounts of only these two supplies, the boat
must be able to float 50 yds of a awimming pool. Now the hard part is
that someone has to maneuver the boat, meaning that it must float
carrying at least 125 lbs. Are there any suggestions as to how many
cartons would be roughly needed to hold up a person and stay afloat at
the same time? Also, any suggestions to the shape of the boat which
would maintain the most bouyany? Thanks!