[python] Re: AW: Re: Front Suspension
- From: Olaf Johansson <olaf@xxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sat, 26 Aug 2006 10:28:10 +0200
Please Ronald, don't take me so seriously.
I don't like smileys for two reasons. One is that everything I say
can be regarded as having a smiley attached to it even if it isn't
visible. I believe anything one writes on the net that can't be
followed by a smiley shouldn't be written at all. Hence I find the
thing useless. Secondly, many people use smileys out of cowardliness
so that at the end of their posts you can't tell whether they really
mean what they say or not.
Emotions can't effectively be conveyed through colons, dashes and
dots. Instead of those (poor) pictograms we can use words that
express our feelings far better and more accurately.
But of course I respect anyone who chooses to use smileys.
Olaf :o)
On 26 aug 2006, at 09.46, Ronald W. Hongsermeier wrote:
Olaf,
sorry for the offense. However, typical netiquette includes the use
of so-called emoticons. They are typically used to give an explicit
emotional framework, so that things written, which may in the
opinion of the author be ambiguously construed, receive a flag to
specifically place their emotional value. Thus something followed
by a wink ";-)" may be tongue in cheek, etc. I shall, however, try
in my direct communication with you in the future to elide any such
symbols. This shall however not be constured as a statement
promising to avoid the usage of such symbology in my general
communications in this semi-public forum.
olaf@xxxxxxxxxxxx schrieb:
On 25 aug 2006, at 11.17, Ronald W. Hongsermeier wrote:
olaf@xxxxxxxxxxxx schrieb:
On 25 aug 2006, at 09.24, Ronald W. Hongsermeier wrote:
Hi Dirk and listies,
comment below in text.
dirk.bonne@xxxxxxx schrieb:
Thorsten Borm wrote:
A very simple way to have something like an suspension is
this: I use "Schwalbe Big Apple" with 50mm and 2,5 bar
pressure on both wheels. They work very good at rough roads
and little potholes. At flat roads there is nearly no noise
and they are rolling very easy. And - they are looking fine!
I have been eying these tires for some time too, but not
enough place for 50mm tires on my current python :-( On this
(dutch) website: http://www.ligfiets.net/accessoires/
type.php3?id=336 it is said that "best" pressure should be
at 4bars. Bert Hoge made rolling tests for some tires
(unfortunatly I have not the article and its seems not to be
available online). And the curve rolling resistance vs.
pressure for big apple has some kind of "knik" at 4 bars *
below 4bars the rolling resistance curve decreases much with
pressure increase (i.e. not linear with pressure). * above
4bars the rolling resistance does not decrease much more,
and above are not more comfortable.
this is probably a result of designing the tires for a "sweet
spot" in rolling resistance and comfort at the given
parameters. As with all engineering, you can shoot for some
targets but you can't hit all targets at exactly the same
time. ;-)
I think it is useless talking about sweet spots and specific
air pressure levels as long as you don't include a specific
weight. It is all about how the tyre deforms when meeting the
tarmac and the size of this deformation varies if you weigh 60
kg or 90 kg, if you carry equipment or not. And how heavy the
bike is.
It wasn't soooo useless-- (you do understand smileys and
friends? eg.: ":-)" is a smiley face )
Nope. I don't give a penny for those buggers. When words fail one
should remain silent. That said, it was not my intention to sound
impolite.
If one reflects upon uselessness, one will probably find that
very few things in life are truly useless.
Except smileys.
olaf
it got you to talk about specifics, which interest me very much.
I am a neophyte when it comes to the hard facts. I have now
ridden 6 wedge-formed bikes mostly into the junk pile and am
interested in view of increasing back problems in a reclining
position while pedaling. It is impossible for me to have access
to the engineering parameters that guided the people at
Schwalbe. I was simply trying to make a generalization about
design. However my observation is correct and is in fact
underlined by your more specific case explanation.
A good advice given on another list is to inflate tyres with
the specific load on the bike (i.e. yourself plus bags) then
inflate until there is no deformation when you sit on the
bike. If done carefully, there will still be some "suspension"
left for potholes.
The trick is finding an optimum pressure level, balancing
between comfort and minimum rolling resistance. Otherwise we
would ride on steel wheels.
I have experience trying to brake with a front rim on both
concrete and asphalt, thus I have another parameter which speaks
against the use of steel wheels ;-) However, steel wheels and
tracks work very well in dirt, but because of weight
considerations are not too practical for power requirements in
the 125 watt avg. comfort range.
Hm, a good Stones album comes to mind ...
I think of something more like Phil Keaggy's "The wind behind my
back..." and if I'm on steel wheels, then I want a water cushion
under my behind, even on a recumbent.
Olaf
regards,
Ron
.
(thats what they say on that page). dirk
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regards,
ron
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