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 Post subject: aero question
PostPosted: Tue Nov 09, 2004 7:48 am 
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Joined: Wed Nov 03, 2004 4:50 am
Posts: 17
Location: pittsburgh, PA
Maybe this is not an appropriate question for the weight weenies forum but this does seem to be the most active forum for high level knowledgeable racers so,

I was looking for the data that us to be on the old visiontech sight comparing aerodynamic drag of a cowhorn vs. a flat base bar set up but it seems to no longer be on the web, does anybody know the data or know were it can be found?

Thanks

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 Post subject: Re: aero question
PostPosted: Tue Nov 09, 2004 3:27 pm 
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Location: California
Mahoney wrote:
Maybe this is not an appropriate question for the weight weenies forum but this does seem to be the most active forum for high level knowledgeable racers so,

I was looking for the data that us to be on the old visiontech sight comparing aerodynamic drag of a cowhorn vs. a flat base bar set up but it seems to no longer be on the web, does anybody know the data or know were it can be found?

Thanks


Check out http://www.timetrial.org/

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 Post subject: Re: aero question
Posted: Tue Nov 09, 2004 3:27 pm 


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 Post subject:
PostPosted: Tue Nov 09, 2004 5:45 pm 
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Location: Stumptown USA
go to www.visiontechusa.com or www.biketechreview.com www.bicyclesports.com

thats a good place to start

jeremyb

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PostPosted: Wed Nov 10, 2004 3:04 am 
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Negative on those web sites, it us to be on the old vision tech site and the others had a link to it but now it's gone.

Thanks

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 Post subject:
PostPosted: Wed Nov 10, 2004 7:06 am 
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if you wanna pay, go to biketechreview.com there you can see all the aero data you want done by an unbiased source.

jeremyb

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 Post subject:
PostPosted: Wed Nov 10, 2004 7:09 am 
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http://www.biketechreview.com/tunnel/intro_facility.htm

thats the direct link. i dont know the guy, other than he hangs out in the slowtwitch forum and seems to provide an honest service.

jeremyb

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 Post subject:
PostPosted: Wed Nov 10, 2004 9:40 am 
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Joined: Fri Dec 19, 2003 5:39 am
Posts: 47
Location: Canada
I believe the visiontech data was windtunnel drag for the bar only. ie regular bar setup 1 lb of drag, vision .9 lbs of drag. Then they took .1 lbs of drag off a know rider's drag. 5.5 lbs becomes 5.4 lbs which they would run the numbers and would save you 1 min (eg) over 40km.

The trick is if you measure a complete rider/bike with bars it would be greater then 5.4 lbs because how the airflow relates to everything therefore you would get less time savings.

Not saying you won't be faster on a Vision bar but I think it's second over a 40km not minutes like mentioned. Marketing manipulation. Still the tour was won by 8 seconds once. Bet Greg was please to go the extra mile and damn if they don't look sexy.

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Posted: Wed Nov 10, 2004 9:40 am 


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