18-Valve. (pithy) said:Giro d'Italia 2007, stage 17, Monte Zoncolan, power data estimates
Durée = 2020s
Distance = 8000 mètres
Vitesse = 8000/2020 = 3,96 m/s
Masse = 58 kg + 9 kg (vélo)
W = 0,24*v*v*v + 0,137*m*v + 9,81*v*m*p
W = 0,24*3,96*3,96*3,96 + 0,137*67*3,96 + 9,81*3,96*67*0,1319
W = 14,9 + 36,3 + 343,3
W = 394,5 Watts
W par kg = 394,5/58 = 6,80 Watts/kg
If you look at these calculations you see that several coefficients are way off the mark.
the 0.24 for example, which corresponds to 0.5*air density*CdA, should be roughly
0.5*1.03*0.37 = 0.19 which reduces the 14.9 watts to under 11.8 watts
the coefficient of rolling resistance (Crr) in the second term ( 0.137) is 30 to 40 times too large, but in fact the blogger used 0.0137, only 3 to 4 times too large. Anyway a realistic value for a nice asphalted road would be a bit below 0.004
This reduces the second term from 36.3 to 10.6 watts
Thankfully no mistake is visible in the main term.
Assuming the altitude gain by Simoni in 2007 was as stated 1055 meters over the last 8km of Zoncolan climbed in 2020 seconds, we get a total wattage of
11.8 + 10.6 + 343.3 = 368.4 watts for 58 kg of body weight, ie 6.35 watts/kg.
You can although throw in the transmission losses and increase those figures by +2.5% and get 377.6 watts and 6.51 watts/kg.
But then you can also assume that his bike + cloth+ whatever amounted only to 8 kg , not 9 kg and reduce the 2nd and 3rd terms by a total of 5.3 watts and about 0.1 watts/kg.
Now the biggest uncertainty for someone like me who does not know that climb comes from the altitude difference between the finish line and the 8km from the finish point.
I don't know why the blogger decided to use the last 8km rather than the 10km used by the germain website rst.mp-all.de
Anyway, over the full 10 km 1 minute slower than Simoni2007 means about 0.16 watts/kg less for a ~60kg cyclist
Contador- Nibali were about 2 min. slower, ie about 0.3 watts/kg below.