Triathlon - Roo boasting better aerodynamics than Cervelo
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Calminian
07-02-09, 03:32 PM
Any of you seen these wind tunnel results, Quintana Roo is touting?
Wind Tunnel Data Analysis (http://www.quintanarootri.com/3VB_documents/Cd0.1%20WIND%20TUNNEL%20DATA.pdf)
Easy to say whatever you want in the absence of independent tests... It's an annoying fact of life.
Specialized did a similar thing when they released the Transition.
http://www.specialized.com/OA_MEDIA/pdf/Transition_Aero%20flyer.pdf
As DrPete already stated, results are not independant. Doubt any company would publish results that weren't favourable...
All tests were without riders. Frame aerodynamics vary dramatically depending on the rider and their build (i.e. skinny or large legs) and honestly the frame accounts for only a small percentage of the overall drag a rider needs to overcome. Better a frame that fits then a few extra grams saved on the frame. I'd be relying on these drag numbers last if I was thinking of purchasing any of these frames tested...
The difference between the frames are only around 20-40 grams of drag, which from memory is only a few watts difference.
Also conspicuously absent from their test is the P4.
sirious94
07-03-09, 09:21 AM
I would also like to see a -10 degree yaw, I may be wrong, but one would think that QR picked the better of the two, and if air was forced on the "dirty" side there might be some different results.
I would also like to see a -10 degree yaw, I may be wrong, but one would think that QR picked the better of the two, and if air was forced on the "dirty" side there might be some different results.
Or, better yet, give a better idea of real world performance and use yaw angles out to 20-25, because apparently 15 is most common. Hed actually does a good job being forthright about that...
Calminian
07-03-09, 04:13 PM
I still really only use two criteria in selecting my future tri bike. STA and paint job. Everything else if over my head.
asgelle
07-03-09, 04:16 PM
All tests were without riders. Frame aerodynamics vary dramatically depending on the rider and their build (i.e. skinny or large legs)
With the exception of the famous single example*, just the opposite has been shown. There is no significant interaction of the rider on the frame aerodynamics.
*Trimble
With the exception of the famous single example*, just the opposite has been shown. There is no significant interaction of the rider on the frame aerodynamics.
*Trimble
That's interesting! Can you share a link with us that supports this idea?
asgelle
07-04-09, 07:37 PM
That's interesting! Can you share a link with us that supports this idea?
No, I don't know of a single link that shows it, but if you search through the discussions of wind tunnel data, it comes up now and then. You could also search on Trimble to see discussions of how it is the only frame that tested differently with and without a rider.