Thursday, May 31, 2007
The Data Crunching Begins...
This is my power data from the Hillclimb at Kern. I use a *gasp* ibike to collect this data. It's not as good as a powertap...but a heck of a lot cheaper, and still a lot of fun. I first bought it because it uses MEMS accelerometers and pressure sensors, and that is a technology I still work on...so it's nice to see it ending up in products! How it works is it has microaccelerometers and tilt sensors to measure the acceleration and the road grade. It also has a pressure sensor which measures the wind forces acting against you, as well as you calibrate it to account for the frictional losses in your bike/tires/etc. Then it uses the equation P=F*v (power=force times velocity--all vectors of course) and by measuring speed on a wheel pickup, and remembering Newtons Law (F=ma (also vectors)), you can calculate power. Now, it has its good and its bad, but mostly I like it, and it is a MUCH cheaper alternative to a PowerTap.
Anyway, I took data in all my races at Kern except for the TT, as I didn't want to re-mount the thing between races. I didn't have time to go into the data set and delete the downhill part of this file...so the average power isn't really that meaningful...from a quick look at the graph it looks like the average power for me on this climb hovered a tad under 200. Not bad for me, considering Im a lightweight (a tad under 130). I got what I got...although happily I have improved over the training season, so that's all good!
Of course I don't like to get too invovled with the numbers...as it then becomes too much like work and not enough like fun...but sometimes it's neat to look at and look for improvement, etc. :-) And sometimes its fun to look at the really fun stuff like the 900W sprint at the end of a brutal race...to relive the fun.