RE: [PSUBS-MAILIST] VBT (MBT) Revisited Idea

[david cutajar <davecutajar@djcengineering.com>]

I believe he intends to rotate the tube about the
tubes longitudinal axis......this will keep the slot
horizontal, (if the sub is horizontal)
-Dave

--- SFreihof@aol.com wrote:
> Wow, nice "thinking-outside-the-box" idea.  However,
> to operate as envisioned, the slot must remain
> horizontal. I would worry about control problems in
> the event of any change in the pitch of the sub,
> because it changes the orientation of the slot.  The
> longer the tube, the more susceptible to pitch
> induced "burping."  Maybe mount the tube atop a
> pivot point so it remains horizontal?
> 
> There may also be problems with roll, but not as
> pronounced and perhaps negligible, I would guess.
> 
> Stan
> 
> 
> In a message dated 5/7/2004 7:34:35 AM Eastern
> Daylight Time, Fly Deep <flydeep4u@yahoo.com>
> writes:
> >
> >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 travel!
>  ing at
> > even one knot the speed seems to be about right.
>  At 3 knots one starts looking for the break pedal.
>  DJB
> >
> >
> >---------------------------------
> >Do you Yahoo!?
> >Win a $20,000 Career Makeover at Yahoo! HotJobs
> >
> 
> 
> 
> 
>
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