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Cycling Forum / General / Technical / March 2010Amazing ridership with disintegrating wheel
Track tandem blows a front tire, and in Flintstone fashion the front carbon fiber disc wheel gets smaller and smaller until it looks like they are brought down by a pedal strike. Amazing that the captain kept it upright as long as he did. http://www.youtube.com/watch?v=Ngv7Iu3y1o0 and another astonishing save, which has been posted before: http://www.youtube.com/watch?v=Y-z0Kh0pvNM  Signature"I wear the cheese, it does not wear me." > Track tandem blows a front tire, and in Flintstone fashion the front > carbon fiber disc wheel gets smaller and smaller until it looks like > they are brought down by a pedal strike. Amazing that the captain kept > it upright as long as he did. > > http://www.youtube.com/watch?v=Ngv7Iu3y1o0 nice nerves o' steel. I'd have probably flinched. nate Signaturereplace "roosters" with "cox" to reply. http://members.cox.net/njnagel > Track tandem blows a front tire, and in Flintstone fashion the front > carbon fiber disc wheel gets smaller and smaller until it looks like > they are brought down by a pedal strike. Amazing that the captain kept > it upright as long as he did. > > http://www.youtube.com/watch?v=Ngv7Iu3y1o0 Tubular wheels are frequently credited as being more rideable than clincher ones in the event of a puncture. Guess that doesn't apply to light carbon fiber disc models. >Tubular wheels are frequently credited as being more rideable than >clincher ones in the event of a puncture. Guess that doesn't apply to >light carbon fiber disc models. CF is unsuitable for structural components on a bicycle due to its failure mode. Ride it with that knowledge. >> Tubular wheels are frequently credited as being more rideable than >> clincher ones in the event of a puncture. Guess that doesn't apply to >> light carbon fiber disc models. I wonder if it did the track flooring any favors also.... > CF is unsuitable for structural components on a bicycle due to its > failure mode. Ride it with that knowledge. PURE cf/composite is unsuitable. With many (non-bicycle) CF items I've seen they used at least one layer of kevlar in the middle somewhere. The kevlar is tough and holds things together if the carbon get shattered. ~ > >> Tubular wheels are frequently credited as being more rideable than > >> clincher ones in the event of a puncture. Guess that doesn't apply to > >> light carbon fiber disc models. > > I wonder if it did the track flooring any favors also.... There's something I hadn't thought about. I did think about shard of CF out there waiting for the tires of other competitors. Signature"I wear the cheese, it does not wear me." > In article <FBNkn.4409$ao7.1...@newsfe21.iad>, > [quoted text clipped - 9 lines] > -- > "I wear the cheese, it does not wear me." Ban them. That's a damn good reason. In article <ced56b51-873d-4182-bba8-7988a4676908@s36g2000prh.googlegroups.com>, > > Track tandem blows a front tire, and in Flintstone fashion the > > front carbon fiber disc wheel gets smaller and smaller until it [quoted text clipped - 6 lines] > clincher ones in the event of a puncture. Guess that doesn't apply > to light carbon fiber disc models. I don't know why that myth exists. A flat tubular is more likely to come off the rim than a flat clincher IME. Signature"I wear the cheese, it does not wear me." >In article ><ced56b51-873d-4182-bba8-7988a4676908@s36g2000prh.googlegroups.com>, [quoted text clipped - 12 lines] >I don't know why that myth exists. A flat tubular is more likely to >come off the rim than a flat clincher IME. But a flat tubbie tends to isolate the rim from the road with a thin (squashed) layer of rubber - and if it's glued well, does not come off even when deflated. A clincher - unless a fairly wide width compared to the rim - tends to squash and squirrel and leave you riding on the rim itself as it squirrels from side to side. IMHE, YMMV. > In article > <ced56b51-873d-4182-bba8-7988a4676...@s36g2000prh.googlegroups.com>, [quoted text clipped - 15 lines] > -- > "I wear the cheese, it does not wear me." A stuck tub stays stuck even with deflation. Motor paced and events with sprinting should have their tyres shellacked in place. Wired on tyres are never safe on the track because of the loss of control which is inherrent when using a lightweight cover which becomes quickly deflated. > Track tandem blows a front tire, and in Flintstone fashion the front > carbon fiber disc wheel gets smaller and smaller until it looks like > they are brought down by a pedal strike. Amazing that the captain kept > it upright as long as he did. > > http://www.youtube.com/watch?v=Ngv7Iu3y1o0 I wonder how their time on that run compares to another run using a real tire on a real wheel. Equipment that goes the distance has higher performance, in real appreciable terms, than equipment that saves a tiny bit of weight or aero drag but quickly fails. That principle works as well when the relevant units are seconds as when they are decades. Chalo > > Track tandem blows a front tire, and in Flintstone fashion the front > > carbon fiber disc wheel gets smaller and smaller until it looks like [quoted text clipped - 12 lines] > > Chalo Dear Chalo, Some improved spoked wheels may be as good or even better than disks in zero side wind, but nothing else does as well as a disk with a side wind, where the sail effect can actually produce a slight negative drag. A somewhat dated page with a table showing drag for several wheels: http://www.analyticcycling.com/WheelsConcept_Disc.html#Wheel%20Aerodynamics The conventional 36-spoke wheel has a drag coefficient of 0.0491, about 35% higher than the 0.0361 and 0.0364 for the two disks tested. If you plug in the 0.0491 and the 0.0361 wheel drags for both wheels in the pursuit calculator on that site, the two-disk bike leads by 1.192 seconds and 17.2 meters after a standing start 4k run: The results: http://tinyurl.com/yghdwwk The calculator: http://www.analyticcycling.com/WheelsPursuit_Page.html If you double the power from 550 watts to 1100 watts as a crude estimate of a tandem, the 4k lead drops to 0.8 seconds and 15 meters. Of course, rear disks are pretty much standard in high-level time trials. Cheers, Carl Fogel >Dear Chalo, > >Some improved spoked wheels may be as good or even better than disks >in zero side wind, but nothing else does as well as a disk with a side >wind, where the sail effect can actually produce a slight negative >drag. Isn't that video of an indoor track? The wind would be minimal indoors, I'd wager :-) >>Dear Chalo, >> [quoted text clipped - 5 lines] >Isn't that video of an indoor track? The wind would be minimal >indoors, I'd wager :-) Dear S, Yes, but I thought that it was worth pointing out the striking sail effect. You did know about that, right? :-) Cheers, Carl Fogel On 9 Mar, 23:51, * Still Just Me * <noEmailto...@stillnodomainey.com> wrote: > On Tue, 9 Mar 2010 11:49:45 -0800 (PST), "carlfo...@comcast.net" > [quoted text clipped - 8 lines] > Isn't that video of an indoor track? The wind would be minimal > indoors, I'd wager :-) I'd rather be outdoors when the audience is fuelled up on burgers and beers. |
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