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Old 08-27-2009, 06:08 AM   #11 (permalink)
thorpie
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drafting drag seems to assist both

All articles in the cycling forums contend that drafting assists both.
Seems that up to 40% energy saving by the following rider is quoted in many posts.
For the leading rider the only numbers I can find are here http://forum.simwe.com/archiver/tid-818221.html which show a reduction in the drag co-efficient from 0.285 down to 0.277.
These drag co-efficients seem awfully low for bicycles, which are generally quoted up around 0.8. The post doesn't provide any other details of the experiment, such as the speed, frontal area or rolling resistance. By my calculations, at 55 km/hr it reduces the lead riders power by 6 watts, from 361 to 355 watts (< 2%), or increases his/her speed by about 0.4 km/hr.

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