[python] Vedr.: Re: another newcomer
- From: Rasmus Emil Møller <aer@xxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 24 Jan 2007 14:35:38 +0100
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24-01-2007 14:14
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Emne
[python] Re: another newcomer
Henry Thomas wrote:
dirk.bonne@xxxxxxx wrote:
FYI: there has been documented measurements related to this. Check out
this pdf:
http://www.ligfiets.net/redactie/meetligfietsengels.pdf
Dirk
Dirk, thanks for sharing this with us, it was a very interesting read.
There isn't a lot of test data like this that I have found which is
specifically dealing with recumbent.
I am a bit confused about the tires. As I read it, larger rims (26") and
firmer rubber compounds are better at higher pressures (110psi). However I
thought that the Specialized Fat Boy was softer than the Schwalbe Stelvio
Kevlar, or is that not the case.
I read the opposite out of this paragraph and thus no contradiction. The
supple rubber compounds are better. The stelvio material is stiffer and
also has a worse performance.
What I think is interesting is that extreme height differences between
seat / BB are not needed. From 15 -> 25cm is no much different in power.
So you can just as well use 15cms (more ergonomic). note, the measurement
was made for seat angle of 21degrees.
Dirk
Well, I don't remember exactly where, but I read that given the SAME air
pressure, a wider tire will deform less, as the weight is distributed over
a larger area contact patch. The rubber itself does not account for much
rolling resistance. However, usually the large rims are used with less
pressure to obtain a smoother ride, better shock absorption or better grip
for off-road uses.
Rasmus Møller
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