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PostPosted: Tue Jul 17, 2012 11:33 pm 
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Nice plot:

Image

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PostPosted: Tue Jul 17, 2012 11:35 pm 
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Well......that's no fun now is it.

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Posted: Tue Jul 17, 2012 11:35 pm 


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PostPosted: Tue Jul 17, 2012 11:40 pm 
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Source?

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PostPosted: Wed Jul 18, 2012 12:03 am 
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But what's the baseline reference for each one? The usual one is comparing every aero wheel to a Ksyrium, but what about the others?

Body position gives you 80% of your potential gains, if your start point was how high and how wide?

A good skinsuit gives you the most equipment advantage, but compared to what? An average skinsuit? An average road jersey? MTB Baggies and a t-shirt?


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PostPosted: Wed Jul 18, 2012 3:11 am 
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So the lesson is getting our position checked for aerodynamic after getting fitted onto a bike. I wonder how much that will cost us.


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PostPosted: Wed Jul 18, 2012 3:36 am 
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It will you cost you nothing but time if you already own a power meter and willing to do some field testing...

Edit - Removed quote. Thanks 53x12 :wink:

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Last edited by Dalai on Wed Jul 18, 2012 4:09 am, edited 2 times in total.

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PostPosted: Wed Jul 18, 2012 3:57 am 
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i think a session in the A2 wind tunnel in NC is about $400. best to have everything prepared to switch quickly so youre not spending all the time messing around.


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PostPosted: Wed Jul 18, 2012 3:59 am 
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^ Chung method.

http://www.cyclingpowermodels.com/CdAEstimation.aspx

Btw Dalai, don't quote post directly above yours. The mods hate it and it makes them crazy.

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PostPosted: Wed Jul 18, 2012 4:11 am 
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Power meter probably gonna cost 1-2k easily. And field testing may have other uncontrollable variables (wind, and gradient). $400 seems like a good deal to get things check out accurately and cheaply. I think I'm taking the sport too seriously.

Another cheap way is to study the frontal area for the cda model. What you need is a camera and some studio setup, I'm sure that can be calculated fairly fast and cheap.


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PostPosted: Wed Jul 18, 2012 4:20 am 
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Did say if you already own a power meter... The VE model (Chung model mention about actually prefers to have some elevation differences). With wind, you just needs to pick days with calm conditions and find a no traffic circuit to test.

$400 Does seem like a good deal! I spent time in a tunnel locally a while back and it was invaluable. But it's always a quest to refine and using field testing has been shown as an accurate way method to do this without having to go back into the wind tunnel.

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PostPosted: Wed Jul 18, 2012 4:34 am 
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I know these are assumptions but someone worried about aero most likely races. If they are serious about racing they most likely have a PM or have ability to borrow one from a team member. If they don't have time or funds to go to a tunnel, the chung method or VE method like Dalai mentioned are worth while. Especially if you just want to goof around and try different setups.

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Posted: Wed Jul 18, 2012 4:34 am 


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