Re: [PSUBS-MAILIST] RE: payload

[Andy Jensen <drewacard@charter.net>]

Sure you can.
Mechanical advantage!

I think Vance is right about air and hard tanks then I would have no oil rolling around in the sub.

Andy



---- Nomdae Plume <nomdae@hotmail.com> wrote: 
Andy:

At 600' down, the external pressure will be an additional 18 atmospheres squeezing the innertube.  You're not going to be able to find any hand pump that can handle that tremendous pressure.

To get an idea of how much force you would be working with, imagine having a hollow square tube that is welded through the hull of your sub. The inside of this square tube is exactly one inch high, by one inch wide.  Now, you have a square steel rod that is exactly one inch wide, by one inch high, and it's the exact same length as the tube.  Before you put your sub in the water, you put the rod into the tube.

Now, you start descending into the depths of the ocean. The pressure of the water starts to push the rod into your sub!  You grab the rod and push it back.  At 33 feet down, the rod is pushing against your hand with a force of 14.7 pounds.  At 66 feet, it's pushing with a force of 29.4 pounds.  When you reach 600 feet, that same rod is pushing against your hand with over 267 pounds of force! (I hope you're alot stronger than I am!!)

Now...that's just one square inch of surface area.  How much surface area is on a truck innertube?

I'm sorry Andy, there's just no way you can generate that kind of pressure with a small electric pump, or a hand pump.

-- NP



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