Mailing List Archive Mailing List Archive
Le 3 Jan 97 @ 10:37, Alex Varouxis =E9criv=EEt sur "Re: Doing it Right
(or I wanna be a":
> At 08:06 PM 1/2/97 -5, Marc Dufour wrote:
>
> >How could a ROV perform accurate surveys? By carrying an inertial
> >navigation platform? How accurate are those anyways?
>
> Very
Within inches and minutes of arc???
> >Aren't there ROVs who carry the spool of cable, unrolling it behind
> >them (=E0 la cable-laying ship), instead of dragging it all over the
> >place and risk catching it somewhere, or worse, causing a cave-in?
> >
> >How big the cable need be? You only need two big power cables, and
> >two or three fiber optics for the data/video/control.
>
> 10,000 feet of cable will drag in a cave, no way around it even with
> the use of reels.
I mean that the reel is on the ROV, being unwound as it goes, to
minimize the amount of the cable scrubbing against the floor. I've
seen this used on a police bomb-defusing robot; this way, the robot
can go all over the place and needs not to be super-powered to drag
the big cable and high-pressure water hose, because it defuses bombs
with a high pressure (about 4-5000 psi) water jet.
Don't laugh, I've seen a high-pressure water jet used in subway
tunnels and it even slices through the gravel used in the concrete!
The pump sends the power of a small locomotive into a 3cm thick hose,
gushing into a jet of water only 4mm wide. Awesome, and the biggest
amount of noise comes from the diesel engine.
The operator wears what looks like a samoura=EF armor...
--------------- Pour la Republique Francaise du Quebec -------------------
In the French version of "2001: A Space Odyssey",
the last word uttered by HAL is "GOD"...
~~~~~~ last dive: The almost fully frozen canal Soulanges, 5mfw ~~~~~~~~
Marc Dufour - [\] ACUC6 31874 - TDI CD-0197 - http://www.accent.net/emdx
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