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The deck dips down in front in advance of going forward not because of it. A gyro or manual Segway has to tilt accordingly to the amount of acceleration required. This would happen by the way even if your Segway has it's platform over the axles.
Yes, the Segway has its platform well under the axle line and although it is harder to make them like this it is for good reason.
The heaviest things on it are at the lowest possible position...that is the batteries, then the motors and the aluminum casing etc.
If they were trying for a high CG they would have put the batteries in the steering stalk like the batteries in a flashlight.
I finally made a dv .mpg clip of the KnightKrawler at it's VCU debut. (I apologise for the poor quality animated gifs) I wish it were lighter but you can adjust that I hope. I'll make a link to it soon.
The pendulous action yuo describe certainly can happen on our machine as a result of over correcting and in the case of the Segway as a result of a new rider not trusting the stablility of the machine. I will say that in both cases it is experience and anticipation that will fix that problem for the most part.
Looking at the Video from March 2003 of me on that knightKrawler I can say I am smoother than that now!
And a Segway with the base over the axles will probably be fine provided there is power to make it work for a more novice rider.
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