Re: Acapulco H.E.A.T. Auxilliary Review

In a post to cypherpunks, L. Todd Masco <cactus@bb.com> wrote:
> In article <199409190629.AA24697@metronet.com>, David K. Merriman
> <merriman@metronet.com> wrote:  

> >There *was* a brief flurry of goodguy/badguy underwater WWF 

> action, but considering that their alleged bottom time for 

> the dives was 25 minutes (any diver confirmation out there?),
> 

> At 102 feet? ... it's just from a long-ago PADI training and a
> couple of shallow dives following, but from what I remember:
> 

> 	- the rule of thumb is that 30 feet of water get you an
> 		atmosphere.  So you're at 102 you're at just
> 		under 4.5, so you're using air at the rate of
> 		4.5 times the rate you do on the surface.

It's 1 atmosphere for every 33 feet, but either way, I don't see how
you managed to get 4.5 * the rate. At around 3 atmospheres, you're 

using air at about 4 times the 1 atmosphere rate.

> 	- My dives were usually 30-60 feet (say, half the pressure
> 		the H.E.A.T. team dealt with), and I was able to stay
> 		down for over an hour, with one tank.  That means
> 		that with two tanks they should have had at least
> 		a similar limit, say an hour.  On the other hand,
> 		I wasn't wrestling... Exertion can pull you way
> 		down.  If they were giving a definite, solid time
> 		limit, it's definitely bogus ("Let's see, five
> 		minutes at 10 times air consumption while you
> 		fight...") for air limitations.

Hmmm. I believe that the diving depth-to-time tables (which I don't have
in front of me. I'll get them out and double check later) give a
time of around 25 minutes. It has nothing to do with how much air you
have. The tables are used to avoid the bends and nitrogen narcosis.

In article <9409191048.AA11766@memexis.memex.com>,
Jonathan Adams <jonathan@memex.com> wrote:
>> 	- the rule of thumb is that 30 feet of water get you an
>> 		atmosphere.  So you're at 102 you're at just
>> 		under 4.5, so you're using air at the rate of
>> 		4.5 times the rate you do on the surface.
>
>It's 1 atmosphere for every 33 feet, but either way, I don't see how
>you managed to get 4.5 * the rate. At around 3 atmospheres, you're 
>using air at about 4 times the 1 atmosphere rate.

That's because you didn't add the 1 atmosphere you've already got
above the water to your pressure count, while I did.   We clearly
meant the same thing, since we both got ~4 times the rate.

>Hmmm. I believe that the diving depth-to-time tables (which I don't have
>in front of me. I'll get them out and double check later) give a
>time of around 25 minutes. It has nothing to do with how much air you
>have. The tables are used to avoid the bends and nitrogen narcosis.

I've been assuming that it wouldn't be a problem for the H.E.A.T. folks
 to ascend slowly.  Wouldn't this avoid decompression sickness?  Again,
 it's been a really long time -- moving from Florida to Pittsburgh and
 then NYC will do that.
-- 
L. Todd Masco  | "A man would simply have to be as mad as a hatter, to try and
cactus@bb.com  |  change the world with a plastic platter." - Todd Rundgren