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
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