A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Techniques
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

New airless tire



 
 
Thread Tools Display Modes
  #1  
Old March 15th 09, 04:44 AM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 349
Default New airless tire

http://www.cnn.com/video/#/video/tec...tweel.tech.cnn
Not solid rubber, rubber support ribs radiating from the hub.
Ads
  #2  
Old March 15th 09, 05:23 AM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 7,934
Default 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
  #3  
Old March 15th 09, 03:08 PM posted to rec.bicycles.tech
jim beam[_4_]
external usenet poster
 
Posts: 318
Default New airless tire

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


complete the sentence: "with 'rim' distortion"...



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

  #4  
Old March 15th 09, 08:51 PM posted to rec.bicycles.tech
Nick L Plate
external usenet poster
 
Posts: 1,114
Default 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
  #5  
Old March 15th 09, 08:51 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 114
Default 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)
  #6  
Old March 15th 09, 08:56 PM posted to rec.bicycles.tech
Tom Sherman[_2_]
external usenet poster
 
Posts: 9,890
Default 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
  #7  
Old March 15th 09, 08:58 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 114
Default 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
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Airless tire impressions Phil, Squid-in-Training Techniques 2 February 5th 05 05:05 PM
Need Advice on Airless Rear Tire for an Easy Tour Bob500 Recumbent Biking 8 November 22nd 04 01:08 PM
Michelin Airless Tire (for cars) Richard Tack Techniques 17 September 30th 04 09:52 PM
airless tires johnson.. Recumbent Biking 13 August 24th 04 01:03 AM
airless tires Mistercookieface87 Unicycling 10 November 17th 03 08:55 AM


All times are GMT +1. The time now is 06:03 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 CycleBanter.com.
The comments are property of their posters.