On Thu, 02 Oct 2003 12:05:50 -0700, Pierce Nichols
<[EMAIL PROTECTED]> wrote:
>> What is wrong with attaching 4 cables/chain/rope to the feet?
>
> If one of the four cables goes taut before the others, it will have the
>same effect on the control system as one of the legs striking the
>ground, i.e. it will screw up the control system's sense of its
>orientation.
It's a problem even if the control system stays oriented. Armadillo
discovered during Spider testing that pulling against a tether pitches
the vehicle away from the tether, making the instability worse.
Better to put the tether attach point above the CG, so a pull will
pitch the vehicle toward the taut tether and away from badness.
Better still to attach the tether so that pulls don't pitch the
vehicle, but with a lowering CG I don't know how to do that.
>If you have a single cable attached at the center of the
>vehicle, it going taut will have much less of an effect on the balance
>of the vehicle.
I'm not sure that's true.
-R
--
"SEAL training is just like Ranger training, except
it's three weeks longer. It takes that long to teach
them how to balance the balls on their noses."
-- Doug Jones
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