The main effect of the longer arms is, by the resulting geometry changes, to actually reduce the pressure at the contact patch of the tires as the car rolls through the corners. This in turn helps the rear end rotate progessively and consistently through the turns.
The reason Kyosho have gone longer arms on the rear of the RB5 and shorter on the ZX5-SP / FS is that the RB5 had such a locked in rear end that it was hard to get the back end to rotate at all without setting the car up generally loose where as the ZX5 had little rear end and would try and turn up it's own wing mounts!
I've tried lots of different combinations of rear arms & hubs and found that it is not really possible to improve (using off the shelf Kyosho parts) over where the cars have currently ended up.
It is a shame that the rear arms and hubs are not common between the two cars though as obviously that means you need to carry twice as many spares!
You coming over to the red corner the G'????? It's nice here!!!
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