#1
|
|||
|
|||
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 |
Ads |
#2
|
|||
|
|||
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
|
|||
|
|||
"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
|
|||
|
|||
"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
|
|||
|
|||
TIC: Golf balls are dimpled to reduce drag. This may be an unexplored
direction in bicycle technology. |
#6
|
|||
|
|||
"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
|
|||
|
|||
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
|
|||
|
|||
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
|
|||
|
|||
"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 |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Rec.Bicycles Frequently Asked Questions Posting Part 1/5 | Mike Iglesias | General | 4 | October 29th 04 07:11 AM |
Imported custom aluminum frames? | Chalo | Techniques | 2 | October 10th 04 02:19 PM |
FAQ | Just zis Guy, you know? | UK | 27 | September 5th 03 10:58 PM |
Economics of Custom Frame Building in non Ferrous Materials | AndyMorris | Techniques | 29 | August 29th 03 02:23 PM |