"St." <dot### [at] dotcom> wrote in message news:47e3be7e$1@news.povray.org...
>

>   Well, ok, but what if the back springs were just rewound by the drive of
> forward motion (and not from the front two springs) anyway?

You'd still get less energy (a lot less) back into the spring. Basically

Energy from unwinding spring = energy converted into forward motion + energy
stored back in spring + energy converted to heat.
(or in physics terms)
Energy added to system = Delta (kinetic energy) + Delta(potential energy) +
heat

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