D
Dan Connelly
Guest
According to www.cyclingnews.com/news.php?id=news/2007/may07/may31news2 :
Gilberto Simoni (Saunier Duval-Prodir) conquered the 10.1-kilometre Monte Zoncolan in 1850 metres per hour according to La Gazzetta dello Sport. The speed, 39 minutes over the 1203 metres, 1850 VAM (Velocity Ascended, Metres per hour Vm/h), was faster than that of Ivan Basso on the Maielletta Passo Lanciano in 2006, 1805 VAM. Marco Pantani blasted up the Alpe d'Huez with a 1791 VAM and Danilo Di Luca did the final four kilometres of Tre Cime di Lavaredo with a 1750 VAM.
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The steep climb reduces the influence of rolling resistance and wind resistance. Rolling resistance losses were further reduced by the fresh pavement.
Profile of the climb:
http://www.cyclingnews.com/road/2007/giro07/graphics/profile17a.gif
vertical gain: 1200 meters
effective climbing from rolling resistance (assume Crr = 0.5%) : 10.1 km * 0.005 = 50.5 meters
net effective climbing rate = (1200 + 50.5) / 1200 * 1850 = 1928 m/hr
Assume CdA =~ 0.3 m^2
speed = 10.1 km * 1850 m/hr / 1200 m / 3.6 (m/s / km/hr) = 4.32 m/sec
Assume rho = 1.2 kg / m^3
wind power = 4.32^3 * 1.2 * 0.3 / 2 = 14.6 watts (slightly less from drafting, slightly more from nonuniform speed).
climbing + RR power = 1928 m/hr / 3600 s/hr * 9.8 m / s^2 = 5.25 W/kg (total weight)
Assume bike + stuff = 9 kg
body = 60 kg
power/body mass = 5.25 W/kg * (69 / 60) + 14.5 W / 60 kg = 6.28 W/kg for 0.65 hours.
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So, for Old La Honda (393 meters, 7.3%, Woodside, CA), assuming Crr = 0.6%, assuming a critical power model with AWC/CP = 60 seconds:
OLH time = 13.88 minutes (6.56 W/kg)
(I solved this iteratively)
These numbers are not at the level of the great Alpe d'Huez climbs. But we knew that already about Simoni...
Dan
Gilberto Simoni (Saunier Duval-Prodir) conquered the 10.1-kilometre Monte Zoncolan in 1850 metres per hour according to La Gazzetta dello Sport. The speed, 39 minutes over the 1203 metres, 1850 VAM (Velocity Ascended, Metres per hour Vm/h), was faster than that of Ivan Basso on the Maielletta Passo Lanciano in 2006, 1805 VAM. Marco Pantani blasted up the Alpe d'Huez with a 1791 VAM and Danilo Di Luca did the final four kilometres of Tre Cime di Lavaredo with a 1750 VAM.
-----
The steep climb reduces the influence of rolling resistance and wind resistance. Rolling resistance losses were further reduced by the fresh pavement.
Profile of the climb:
http://www.cyclingnews.com/road/2007/giro07/graphics/profile17a.gif
vertical gain: 1200 meters
effective climbing from rolling resistance (assume Crr = 0.5%) : 10.1 km * 0.005 = 50.5 meters
net effective climbing rate = (1200 + 50.5) / 1200 * 1850 = 1928 m/hr
Assume CdA =~ 0.3 m^2
speed = 10.1 km * 1850 m/hr / 1200 m / 3.6 (m/s / km/hr) = 4.32 m/sec
Assume rho = 1.2 kg / m^3
wind power = 4.32^3 * 1.2 * 0.3 / 2 = 14.6 watts (slightly less from drafting, slightly more from nonuniform speed).
climbing + RR power = 1928 m/hr / 3600 s/hr * 9.8 m / s^2 = 5.25 W/kg (total weight)
Assume bike + stuff = 9 kg
body = 60 kg
power/body mass = 5.25 W/kg * (69 / 60) + 14.5 W / 60 kg = 6.28 W/kg for 0.65 hours.
--------------
So, for Old La Honda (393 meters, 7.3%, Woodside, CA), assuming Crr = 0.6%, assuming a critical power model with AWC/CP = 60 seconds:
OLH time = 13.88 minutes (6.56 W/kg)
(I solved this iteratively)
These numbers are not at the level of the great Alpe d'Huez climbs. But we knew that already about Simoni...
Dan