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Re: pic: 1885 Drive Train 2010
I believe the main advantage to articulating the wheel pods is to maintain a more level chassis while going over the bump.
Look at the wooden model in the picture Jason provided. If the rear wheel pods are articulated (rotated) so that only the rear-most wheels are touching, the angle of the main frame will be at a lesser incline and provide a greater safety factor to prevent the center of mass from getting close to the tipping point.
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Warning: this reply is just an approximation of what I meant to convey - engineers cannot possibly use just written words to express what they are thinking.
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