For 3 D you could do it with four towers and 3 beams. You could counter balance to get rid of the beam weight and calculate out the inertia of the beams mass. Would it be worth testing within a 25' square? That would be 4 25' towers and three 25 foot beams. Of course the subject would sit in a gimble, limit switches for safety of course. The towers could be guyed at 3 points at 120 degrees without the guys entering the "box". 8 guys could share 4 anchors, 8 total anchors, 12 total guy wires, hey a lot of yous guys are hams, you should be able to build one of these real quick.
With a little design the "box" could be portable and fit on a small boat trailer when disassembled. There might even be the possibility that you could rent the thing out to cover costs.
Do you think these G free boxes already exist OTS? Perhaps from the movie industry?
Randall Clague wrote:
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
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