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Re: ballast
David Buchner wrote:
>
> This is something I've been wondering about. How much buoyancy does one
> need to change? Like, how big should I be thinking about making those
> tanks?
SNIP
Use two types of tanks. Big ones to give you freeboard and another to adjust to neutral
bouyancy. Blow the main tanks when at the surface after ascending using a small amount
of variable tank.
To descend:
Blow main ballast completely to be "decks awash." (actually to a line painted on the
conning tower glass to calibrate where I'm at so I can add/subtract lead weights to
allow for payload changes)
I control variable bouyancy using the small reversible hydraulic pump which allows oil
in and out of a bladder external to the pressure hull in a fairing behind the conning
tower. The hard internal tank has a sight glass to determine variable bouyancy status.
It, as well as the larger freeboard ballast, can be blown by compressed air in
emergencies.
--
Martin Sanderse
---------------
The Ingenuity Group Inc. http://www.ingenuitygroup.com/~tigroup/
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