>> As Choset cautions, there are no robotic snakes commercially available =
>for any purpose and their range is still limited by the length of their =
>tethers, which on relatively flat ground might only be 300 to 400 feet.
I'd have liked to see more details about how "robotic snakes" work.
It's hard to guess how a small robotic device could handle the friction of
a tether as *long* as 400 feet, even on smooth flat ground. And any bends
or obstacles would greatly exacerbate the drag. Maybe a tether could be
unreeled from inside the "snake" itself (I think that's how they managed
the ones for the ROVs that explored the Titanic), but that would require a
compartment that could accommodate the stored tether. We know from our
resistivity gear that the volume of a long slender line isn't trivial.
--Donald
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