"Amazingly, even PaulMRotax and I are nearly in agreement over the stiffness"
nope. i was pointing out your self-contradiction regarding seat position.
Pointing out how flexible a seat is out of the kart is about as much use as saying how easy it is to squeeze an empty drinks can, when it can take the weight of an adult when loaded correctly.
Iztech seem to have done finite element analysis of the seat, chassis and together:
http://www.iztechkartseats.com/index.php?option=com_content&view=article&id=59&Itemid=65
i hope they included the inertia of a driver also.
Itd be interesting to see their results.
if anyone has a 3d parasolid of a chassis let me know.
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