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AviationMetalSmith
recumbent enthusiast

USA
252 Posts

Posted - 04/25/2014 :  10:58:44  Show Profile  Visit AviationMetalSmith's Homepage  Reply with Quote


This is an idea for an upright bike. Remember the KISS Rule.

http://www.gizmag.com/null-winds-upper-wheel-fairings/31781/?utm_source=Gizmag+Subscribers&utm_campaign=94f89528bb-UA-2235360-4&utm_medium=email&utm_term=0_65b67362bd-94f89528bb-91366269

Edited by - AviationMetalSmith on 04/25/2014 10:59:40

hordur
Starting Member

Sweden
3 Posts

Posted - 05/25/2014 :  03:41:14  Show Profile  Visit hordur's Homepage  Reply with Quote
i am not totally sold on the concept due to all the bits and bobs sticking out of the construction, such as screws and stiffeners.

I would have suggested a fender with this feature included instead of this solution.
That would eliminate most of the stiffeners needed aswell as providing a better structure to further incorporate the fork in the wheel fairing, steering the air to the outside of the fork instead of between fork and fairing.
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Upright Mike
human power expert

USA
3803 Posts

Posted - 05/25/2014 :  07:21:04  Show Profile  Reply with Quote
He's correct about the wheel moving twice as fast at the top as the bicycle's speed, and essentially zero at ground contact point. But I agree, I'm not sold on the idea of the thin rods and extra bits sticking out in the wind. At a minimum, the rods should be going horizontal.
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Speedbiker
human power expert

USA
3704 Posts

Posted - 05/25/2014 :  09:36:27  Show Profile  Reply with Quote
3%, maybe. 20% is ridiculous. I volunteer to race anyone who bolts that junk to their bike.
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PUGZCAT
recumbent enthusiast

Canada
459 Posts

Posted - 05/26/2014 :  15:06:22  Show Profile  Reply with Quote
The concept would be best integrated into a custom frame and fork with purpose built braze-ons.
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cplager
Starting Member

USA
13 Posts

Posted - 05/27/2014 :  11:39:35  Show Profile  Visit cplager's Homepage  Reply with Quote
quote:
Originally posted by Speedbiker

3%, maybe. 20% is ridiculous. I volunteer to race anyone who bolts that junk to their bike.



20% speed increase at the same power means an over 40% reduction in aerodynamic drag (assuming drag is only aerodynamic - more if there is rolling resistance).

I'm sorry. I just don't buy 20%.

Heck, I'll race anybody who bolds that to their bike and I'm notoriously slow. :D

http://Charles.Plager.net
http://RecumbentQuant.blogspot.com
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