Hello!
I went to the running track nearby today and rode 3x3 laps. Not the best surface to ride on but it should at east be consistent and I did average about 30kph. 1st 3 laps sitting up, 2nd round in normal aero position and the last round I tried to become as small as possible by moving back a little and hunkering down. I then uploaded the session into Golden Cheetah, entered my total weight and then adjusted each intervall so that V-elevation was as close as Elevation as possible. This gave me CdA:
0.418
0.363
0.335
I understand that they are not really correct CdA-values since I didn't enter correct temperature, Crr and Rho but if I'm only interested in how the positions compare relative to each other, does the values I got reflect real differences or is this simple test not valid for some reason? Since the test was performed within 20 minutes I assume temperature and air pressure was constant.
If so, next time I will test something I'll start with the best position from the previous test session and then compare to whatever I would like to test next. I can then work my way to a better setup although I will never know the real CdA.
Regards Patrik
I went to the running track nearby today and rode 3x3 laps. Not the best surface to ride on but it should at east be consistent and I did average about 30kph. 1st 3 laps sitting up, 2nd round in normal aero position and the last round I tried to become as small as possible by moving back a little and hunkering down. I then uploaded the session into Golden Cheetah, entered my total weight and then adjusted each intervall so that V-elevation was as close as Elevation as possible. This gave me CdA:
0.418
0.363
0.335
I understand that they are not really correct CdA-values since I didn't enter correct temperature, Crr and Rho but if I'm only interested in how the positions compare relative to each other, does the values I got reflect real differences or is this simple test not valid for some reason? Since the test was performed within 20 minutes I assume temperature and air pressure was constant.
If so, next time I will test something I'll start with the best position from the previous test session and then compare to whatever I would like to test next. I can then work my way to a better setup although I will never know the real CdA.
Regards Patrik