Re: [PSUBS-MAILIST] width to length ratio

["Paul Kreemer" <paulkreemer@gmail.com>]

Assuming that you're using high pressure 120cf steel tanks, they're about 10lbs negative when full (and close to neutral when empty).   That cubic foot of displacement is offset by the high quality steel and high pressure air.  :-)

So to make up the lost passenger weight, my estimate is that you're better off leaving the two full tanks on.  


Paul

On 12/2/06, Joseph Perkel <joeperkel@hotmail.com> wrote:

Vance,

Yes, the tow-ability issue precisely as you described, has much to do with
what I've been doing to the design.

I have noticed that lake Diver and Persistence both have to add a bunch of
free weights when they dive solo. Iv'e been told it's because these boats
are so small and "tender" payload wise, that you have to adjust your final
dive weight either with or without a second person.

So here's a question.......

If I add that second pair of 120's, each cylinder displaces about 1 cubic
foot, give or take. If I adjust the final weight of the boat at full payload
(with second crew, at say 200 lbs) and all four of these cylinders for
perfect dive trim (and use VBT for negative).

Then when I want to dive solo, removing two of these cylinders should mean
that I would only have to add about 70 lbs of free weights rather than a
full 200 lbs. Is this correct reasoning?

Joe