[python] Re: another newcomer
- From: Ronald Hongsermeier <ronwhongsermeier@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 26 Jan 2007 00:57:38 +0100
home@xxxxxxxxxxxxxxxxx wrote:
I guess on a larger wheel more rubber is envolved in the flexing than
on a smaller wheel.
But saying that a softer compound would give less rolling resistance
... uh, uh. I am not yet willing to buy that. Anyone who let out 20
psi from the bike's tyre will notice an increased amount of sweat on
their forehead.
olaf
On 24 jan 2007, at 14.14, dirk.bonne@xxxxxxx wrote:
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.
<moz-screenshot-1.jpg>
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
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While agreeing with you in the main, I think there may be a gray area
where a thin layer of stuff that's not so stiff may have the effect of
counteracting a negative rough surface effect, though I have neither
numbers nor specific theory for this idea /*i.e., the stiffness of the
surface of the tire may transmit energy into vertical motion which takes
away from forward speed.*/
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