GizmoDuck said:After a couple of cm's of squish, the original seat can't compress
anymore anyway, so the rest of the foam thickness is just a waste of
space.
That conclusion (the rest of the foam thickness is just a waste of
space) makes me wonder if you assume that if the foam is partially
compressed, the top part of the foam is fully compressed and the rest
is not compressed at all.
IMHO that's not what happens. All of the foam, from top to bottom,
compresses to the same amount.
If it were an open-cell foam, all of the squishiness comes from the
elasticity of the rubber/plastic material. Indeed, tthere would be
quite a hard limit to how far it would compress because then all the
'pores' were squished completely, the air having flown out. But even
in that case, it wouldn't mean that some of the foam thickness is a
waste of space. If you take away some of the foam, the maximum
compression will be less.
And then again, I think the KH foam is a closed-cell foam, i.e. there
is a gas in the pores and the pores are closed so the gas cannot
escape. In closed foams, much of the squishiness of the foam comes
from the gas in the closed pores being compressed. Extreme conditions
aside, there is no hard limit to the compression of closed-cell foam.
Therefore, I don't concur with "After a couple of cm's of squish, the
original seat can't compress anymore anyway", it is not my impression
of how the seat behaves.
Disclaimer: I am not a foam expert, this is just my physical
reasoning.
Klaas Bil - Newsgroup Addict
--
It's impossible to get old when you ride a unicycle - John (what's in a name) Childs
