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Forum: "The 33"-Road Bike Racing

10-21-11, 05:02 PM

Replies: 44

You know, it's possible to estimate CdA and Crr without a power meter

Views: 7,447

Posted By stedalus

If you can look at that graph and think that you...

If you can look at that graph and think that you know the grade down to 0.1%, more power to you. (Pun not intended. I'll quit here.)

Forum: "The 33"-Road Bike Racing

10-21-11, 03:39 PM

Replies: 44

You know, it's possible to estimate CdA and Crr without a power meter

Views: 7,447

Posted By stedalus

Yes, an interpolated elevation profile will...

Yes, an interpolated elevation profile will appear nice and smooth. Differentiate it (ie, figure out the grade) and you get this: (red and blue is each run)

223957

Forum: "The 33"-Road Bike Racing

10-21-11, 03:05 PM

Replies: 44

You know, it's possible to estimate CdA and Crr without a power meter

Views: 7,447

Posted By stedalus

Like I said, you can do that calculation, but the...

Like I said, you can do that calculation, but the output is going to be really noisy because of the dv/dt term. Probably at best you can say -4.1 +/- 1.

Forum: "The 33"-Road Bike Racing

10-21-11, 02:00 PM

Replies: 44

You know, it's possible to estimate CdA and Crr without a power meter

Views: 7,447

Posted By stedalus

Sorry, I wouldn't be of much help. Clearly the...

Sorry, I wouldn't be of much help. Clearly the laws of mathematics stop working when you put a $ in front of the number.

Forum: "The 33"-Road Bike Racing

10-21-11, 01:50 PM

Replies: 44

You know, it's possible to estimate CdA and Crr without a power meter

Views: 7,447

Posted By stedalus

I get Crr = 0.0064 and CdA = 0.378 m^2. ...

I get Crr = 0.0064 and CdA = 0.378 m^2. Basically you do as above and write out the energy budget. It looks like

alpha * Crr + beta * CdA = gamma

where

alpha = -mg*integral(v)
beta =...

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