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New airless tire
http://www.cnn.com/video/#/video/tec...tweel.tech.cnn
Not solid rubber, rubber support ribs radiating from the hub. |
New airless tire
On Sat, 14 Mar 2009 20:44:42 -0700 (PDT), "
wrote: http://www.cnn.com/video/#/video/tec...tweel.tech.cnn Not solid rubber, rubber support ribs radiating from the hub. Dear Mike, The tweel's flexible spokes do a nice job of illustrating how the spokes under a loaded axle behave: http://i42.tinypic.com/qso7qq.jpg Unless Michelin comes up with some kind of cover, the wind drag will be impressive. Maybe the flexing shown in the picture would prevent snow, ice, and slush from filling the voids? Cheers, Carl Fogel |
New airless tire
On 15 Mar, 04:15, wrote:
Mike Schwab wrote: *http://www.cnn.com/video/#/video/tec...tweel.tech.cnn Not solid rubber, rubber support ribs radiating from the hub. All cushioning on a pneumatic tire is offered by an air spring with no measurable losses while clincher losses are from bending tread, casing and inner tube, all small amounts that are hard to measure accurately without careful instrumentation. *In contrast the "rubber support" has large hysteretic losses that can be sampled by stretching a broad flat rubber band and sensing its temperature against the upper lip. I don't know what the main goal of this airless tire is, but it better not be low RR, one of the main interests for bicyclists. It seems to me to be a development of the military pneumatic tyres that can be used after the side wall has been blown out. They've just made an announcement for general publicity purposes. It's unlikely ever to have a general consumer use, although run-flat sales are increasing. TJ T |
New airless tire
On Mar 14, 11:44*pm, "
wrote: http://www.cnn.com/video/#/video/tec...tweel.tech.cnn Not solid rubber, rubber support ribs radiating from the hub. Yeah, in the four years since I read about th' tweel, it has revolutionised transport as we know it. 'member the bad ol' day(s) when we had to replace just the outer rubber covering on our (p)neu(u)- matic Hweal-tire hybrids? Morons! Using the devil's spirit to suspend something when good ol' flexible petrochemicals could do the same job at some thousands of times the weight* and only one order of magnitude greater in cost! *sorry: ~0.0012g/ml v. ~1.25g/ml, so closer to 1041 times (frowny face) |
New airless tire
wrote:
On Mar 14, 11:44 pm, " wrote: http://www.cnn.com/video/#/video/tec...tweel.tech.cnn Not solid rubber, rubber support ribs radiating from the hub. Yeah, in the four years since I read about th' tweel, it has revolutionised transport as we know it.[...] I expect it will have Segway level effect on the overall transportation system!!! -- Tom Sherman - 42.435731,-83.985007 LOCAL CACTUS EATS CYCLIST - datakoll |
New airless tire
On Mar 15, 12:23*am, wrote:
On Sat, 14 Mar 2009 20:44:42 -0700 (PDT), " wrote: http://www.cnn.com/video/#/video/tec...tweel.tech.cnn Not solid rubber, rubber support ribs radiating from the hub. Dear Mike, The tweel's flexible spokes do a nice job of illustrating how the spokes under a loaded axle behave: *http://i42.tinypic.com/qso7qq.jpg Unless Michelin comes up with some kind of cover, the wind drag will be impressive. Maybe the flexing shown in the picture would prevent snow, ice, and slush from filling the voids? I guess over the years (the pic of that Auto-Union quadricycle is from ought-five) they've learnt a few things and finally patented one with a cover: http://www.google.com/patents?id=zEV..._pages&cad=0_1 or http://tinyurl.com/tweel0rz |
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