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Dimpled frames.



 
 
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  #1  
Old December 13th 04, 03:55 PM
Marty Wallace
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Default Dimpled frames.

With dimples being the latest fad in wheels and helmets,
http://www.cyclingnews.com/photos/20...h/?id=zipp/808

are there any dimpled frames out there?

Marty


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  #2  
Old December 13th 04, 07:01 PM
Zog The Undeniable
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Marty Wallace wrote:

With dimples being the latest fad in wheels and helmets,
http://www.cyclingnews.com/photos/20...h/?id=zipp/808

are there any dimpled frames out there?


Yeah - I had bad chainsuck once.
  #3  
Old December 13th 04, 07:40 PM
Bert L.am
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"Marty Wallace" schreef in bericht
om.au...
With dimples being the latest fad in wheels and helmets,
http://www.cyclingnews.com/photos/20...h/?id=zipp/808

are there any dimpled frames out there?

Marty



What would be the valve length ?
Is it real or is it Photoshop?

Bert


--
Posted by news://news.nb.nu
  #4  
Old December 13th 04, 09:56 PM
James Thomson
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"Marty Wallace" wrote:

With dimples being the latest fad in wheels and helmets,
are there any dimpled frames out there?


Oh yes.

http://www.hillbrick.com.au/graphics/xlr8r.gif

http://www.hillbrick.com.au/frames/frames_xlr8r.html

http://www.cyclingnews.com/photos/20...2/DSCN5106.jpg


I quote:


Multishape Damping Effect

XLR8R tubes only can be particularly shaped to obtain a sensible
damping effect of vibration phenomena. The idea is to use a shape
dam on the tube surface in order to damp vibrations in the frame.
This damp effect is obtained by creating three different diameter
punches, on both sides of the top and down tube ends, near the
head tube connection area. The punches are positioned in a zone
where the vibrations coming from the fork enter the frame structure.
Their particular shape enables the vibration dampening in two ways:

1. By creating a physical obstacle to the free movement of the
vibration waves along the tube

2. The emispheric shape of the punches enables the dissipation
of the vibration energy.

Columbus R&D dept. has made severe and repeated tests to define
the dimension and position of the punches and to check the damping
effect. Thanks to this Multishape damping effect, Columbus studies
proved that the vibration phenomena on XLR8R frames come up at
higher average speed than usual.

This is the formula of its success



I'm convinced.


James Thomson


  #5  
Old December 13th 04, 10:16 PM
Leo Lichtman
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TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology.


  #6  
Old December 14th 04, 02:02 AM
Mark Hickey
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"Leo Lichtman" wrote:

TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology.


The trick is to get the frame spinning at a few hundred RPM to make
the dimples work - it's REALLY hard to stay on the bike.

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame
  #7  
Old December 14th 04, 02:22 AM
Terry Morse
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Leo Lichtman wrote:

TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology.


Did you not notice Jan Ullrich's time trial helmet from last year's
Tour de France?

http://www.velonews.com/images/details/4570.5568.f.jpg

Very titlist-ey.
--
terry morse Palo Alto, CA http://bike.terrymorse.com/
  #8  
Old December 14th 04, 03:32 AM
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On Mon, 13 Dec 2004 18:02:41 -0700, Mark Hickey
wrote:

"Leo Lichtman" wrote:

TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology.


The trick is to get the frame spinning at a few hundred RPM to make
the dimples work - it's REALLY hard to stay on the bike.

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame


Dear Mark,

As I understand it, the dimpling effect would actually work
without spinning.

The trick is to present a regularly irregular surface
(sorry, but I can't think of a better phrase) to act as a
trip-wire and produce a thin, even layer of turbulent air
over the ball's surface that reduces separation and drag.

Here's a page with the famous trip-wire demonstration
pictures at the bottom:

http://www.princeton.edu/~asmits/Bicycle_web/blunt.html

Dimples are just the easiest way to reduce drag. They give
increased distance, while the spin is what gives loft,
shank, and slice--and would do so with a smooth ball, too:

http://www.princeton.edu/~asmits/Bic...ortsballs.html

Carl Fogel
  #9  
Old December 14th 04, 03:41 AM
Marty Wallace
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"Bert L.am" wrote in message ...

"Marty Wallace" schreef in bericht
om.au...
With dimples being the latest fad in wheels and helmets,
http://www.cyclingnews.com/photos/20...h/?id=zipp/808

are there any dimpled frames out there?

Marty



What would be the valve length ?
Is it real or is it Photoshop?

Bert


--
Posted by news://news.nb.nu


Yes it's real. Very expensive to produce apparently.

Marty


  #10  
Old December 14th 04, 04:00 AM
jim beam
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wrote:
On Mon, 13 Dec 2004 18:02:41 -0700, Mark Hickey
wrote:


"Leo Lichtman" wrote:


TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology.


The trick is to get the frame spinning at a few hundred RPM to make
the dimples work - it's REALLY hard to stay on the bike.

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame



Dear Mark,

As I understand it, the dimpling effect would actually work
without spinning.

The trick is to present a regularly irregular surface
(sorry, but I can't think of a better phrase) to act as a
trip-wire and produce a thin, even layer of turbulent air
over the ball's surface that reduces separation and drag.

Here's a page with the famous trip-wire demonstration
pictures at the bottom:

http://www.princeton.edu/~asmits/Bicycle_web/blunt.html


fig 5 is a rather good illustration! thanks carl.


Dimples are just the easiest way to reduce drag. They give
increased distance, while the spin is what gives loft,
shank, and slice--and would do so with a smooth ball, too:

http://www.princeton.edu/~asmits/Bic...ortsballs.html

Carl Fogel


 




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