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22/10/2009 9:54:50 PM
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Clayton Marsland
Posts 6
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A great addition to the power estimates would be a calculation to factor in wind speed. I know that from experience, a strong headwind up Norton Summit can add a minute or two on to my times. I know there are a lot of variables including the size of each rider, position of the rider etc and the fact that the climbs do not always head in a single direction but there must be some sort of formula to ball park how many watts would be required to overcome a 20km/h headwind riding at 20km/h for instance.
Thoughts?
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23/10/2009 5:20:48 AM
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Nick Muir
Posts 23
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I agree that it would be great if the power formula factored in the wind direction & strength. The difference in work rate between a strong head as apposed to a strong tail wind on the less steep climbs is very considerable so this idea would allow riders to get a more accurate estimate of there power on a climb . To add to this i think it would be nice if there was another option to enter the weight of the riders clothes , shoes & other stuff carried on the bike - it's good to see what weight bikes people are using & the weight of the rider but the need to add extra kg's to either the body or bike weight to make up the total weight keeps you guessing a bit & effects the power to weight ratio figure ?
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23/10/2009 7:44:34 PM
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Jason Daniels
Posts 30
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Nick, easy, weigh yourself kitted out! Weigh your bike with full bidons etc etc....
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23/10/2009 7:47:34 PM
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Jason Daniels
Posts 30
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And Clayton, Rides like Norton are a poor example for windage, that climb goes from heading into the Hill (east) to heading back towards the coast (West) and then back and forth again....
The wind factor is really only an issue for a ride which heads pretty much in the one direction, such as Cement Hill or the Grove Way or target Hill, maybe Greenhill could be added. But a switchback hill like Norton which is exposed is very variable towards wind direction...
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23/10/2009 11:24:57 PM
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Michael Warner
Posts 122
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Wind direction makes quite a difference to Norton Summit times, though. Despite the switchbacks, my best times are with a decent westerly blowing.
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24/10/2009 4:03:34 AM
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Nick Muir
Posts 23
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Jason, my point was that i would like to be able to see three weights seperatly , ie bike weight - body weight - ancilleries weight ( clothes , shoes , saddle bags ! bottles etc ) , so that it was clear exacty what other peoples body & bike weights are when viewing a climb entry . It's a usefull record of ones own body weight at different times over past years as well :-)
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25/10/2009 5:10:43 PM
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Cos
Posts 30
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As we know C2M's power calculation doesn't take the wind factor into consideration. Times differences is what it mainly works with for the same climb. So if you compare the difference in power when completed in still conditions vs a head wind (all other things being equal?....?), it will be roughly the power lost due to the the wind.
Sure it's really a rough guide, as if you could have the same fitness, effort, similar day temperatures,...., but hey, at least you can get an idea...
You can apply the same logic for hot vs cold days, the power loss is your bodies failure to generate power due to increased inefficiencies under the hot conditions.
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