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  #51  
Old 07-22-10, 03:23
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Cozy Beehive Cozy Beehive is offline
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Anyone ready for John Wilcockson's speculation of Armstrong's power to weight ratio during his attack on stage 16?

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On the Peyresourde, Sørensen was with his team leader Andy Schleck in a small group that went over the summit a minute behind Armstrong’s breakaway; so the Texan had to have been working even harder, perhaps hitting 6.5 watts/kg, equivalent to averaging 450 watts for the half-hour climb. And that was just the start of a near-six-hour stage over four mountains.

No wonder the peloton was ripped apart!
http://velonews.competitor.com/2010/...t-stage_130539
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Last edited by Cozy Beehive; 07-22-10 at 03:42.
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  #52  
Old 07-22-10, 05:06
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Quote:
Originally Posted by Cozy Beehive View Post
Anyone ready for John Wilcockson's speculation of Armstrong's power to weight ratio during his attack on stage 16?



http://velonews.competitor.com/2010/...t-stage_130539
I didn't see Sorensen's power file yet, but I saw the screenshot of Horner's. 5.9 w/kg for 30 minutes in the front group, a minute down. Doing the math in my head, and without seeing the stage, I'd guess there's a 6.5 w/kg 5 minute section in there, with an overall of roughly 6.2 w/kg. For 30 minutes, that's certainly a lot, but doable, particularly on the first climb of the day.

It's a far cry from 6.7-6.9 for almost 50 minutes, that's for sure.
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  #53  
Old 07-22-10, 19:42
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Anyone want to stake a stab on Horner's power going up the Tourmalet? It would be interesting to see how close people can come before the data are online.

Based on his other efforts of the race, I'll say 340W, which is about 5.4 w/kg.
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  #54  
Old 07-22-10, 20:18
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Yes, would be interesting as he was close to the front: chance to compare a good baseline set of data vs. estimates near leaders.

Last edited by Parrot23; 07-22-10 at 20:22.
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  #55  
Old 07-22-10, 20:27
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Quote:
Originally Posted by Parrot23 View Post
Yes, would be interesting as he was close to the front: chance to compare a good baseline set of data vs. estimates near leaders.
well, already knowing Horner's power data throughout the race, it makes this question way easier to answer. Still, I'm curious how the models compare to reality. That, of course, is assuming that his SRM is calibrated.
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  #56  
Old 07-22-10, 20:34
djconnel djconnel is offline
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VAM, anyone?

Here's a profile.
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  #57  
Old 07-22-10, 21:07
DarkWing DarkWing is offline
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the VAM for today?
I timed andy and contador at about 49minutes.
and they climed 1405 meters.
that's a VAM of 1720
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  #58  
Old 07-22-10, 21:22
djconnel djconnel is offline
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Okay.... then some quick assumptions:

mass = 65 km
bike = 7 kg
equipment = 2 kg
total = 74 kg
Crr = 0.3%
CdA = 0.35 m²
rho = 1.1 kg/m³
distance = 19 km
net climbing: 1404 meters
time = 49 minutes
drivetrain efficiency = 98%

6.35 W/kg powertap
6.48 W/kg SRM


Compare with L'Alpe d'Huez VAM numbers according to Science of Sport blog


And "Bjarne Riis is estimated to have produced 6.8W/kg (480W) on Hautacam when he won the Tour in 1996. Armstrong's estimated power output on Alp d'Huez was 6.6 W/kg (465W)..

No sign of special sauce.

Last edited by djconnel; 07-22-10 at 21:27.
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  #59  
Old 07-22-10, 21:27
smaryka smaryka is offline
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From the look of the flags, there was a tailwind for at least some of it.

Regardless, some people had a very good day after the rest day (Horner) and others not so good (Leipheimer).
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  #60  
Old 07-22-10, 23:55
djconnel djconnel is offline
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In my estimate, 0.80 (powertap) or 0.82 (SRM) W/kg were wind resistance.

So even if you assume each rider drafted 50% of the time and that draft was worth 25% of wind resistance, that reduces the estimate by around 0.11 W/kg, to 6.37 W/kg SRM.

Toss in a tailwind, and it the error bars start to blow out.

But we're definitely well on the clean side of 6.7 W/kg.
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