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Re: [PSUBS-MAILIST] VBT (MBT) Revisited Idea - another one..

Pierre,
Since you are building an ambient, is is possible to have SOLID objects inside the hull of your machine as you dive, which you can extend into the water to modify your displaced mass? That might pop your ears if you do it too fast though! 
EM.

Dan H. wrote:


DJB,
What happens to the air in the tube as you dive deeper?
Doesn't it compress and allow the volume of water to increase as it comes in through the open slot, making you heavier as go deeper compressing the air more, letting in more water and so on and so on? 
Dan H.

    ----- Original Message -----
    *From:* Fly Deep <mailto:flydeep4u@yahoo.com>
    *To:* personal_submersibles@psubs.org
    <mailto:personal_submersibles@psubs.org>
    *Sent:* Friday, May 07, 2004 7:34 AM
    *Subject:* RE: [PSUBS-MAILIST] VBT (MBT) Revisited Idea

    About 2 years ago, or some thing like that. I posted an idea that
    may help this Ballast Thing regarding home builds. It’s dirt
    simple and cures a few problems. The idea: Two tubes with a slot
    cut in them from one end to the other. A tube on either side of
    the sub. When you want to reduce ballast you just turn the tube
    and let out some air. When you want to go back up,,,you just
    rotate the tube so that the slot is back down a little bit, and
    add some air. But the tubs create an automatic and infinitely
    Variable ballast system. It’s also very easy to build. There are
    several ways to put the air inside and to rotate the tubes and
    your imaginations can come up with good ones. But the concept is a
    good one and would work. And if one sets the tube so that the
    slots are at a cretin point in rotation then that becomes the
    variable ballast. It also eliminates valves to let out air for the
    ballast system to operate. Things happen very slow down there and
    if one is traveling at even one knot the speed seems to be about
    right. At 3 knots one starts looking for the break pedal. DJB

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