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Old 09-14-2008, 04:41 PM   #1 (permalink)
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Talking Who needs an aerodynamic shell?

A human body head first arms at sides has a decent Cd of 0.3~0.4, and a small frontal area:

Amazing how he steers, brakes and overtakes bikes. That's some coasting!

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Old 09-14-2008, 05:20 PM   #2 (permalink)
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Yeah, I've seen that before. Fantastic and utterly terrifying at the same time.


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Old 09-14-2008, 05:29 PM   #3 (permalink)
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Cool to watch but I can't imagine this is legal... but forget about the human sled -- the quality of that road is amazing!!!! I know I've read and heard about it but seeing well maintained foreign roads on this level/distance and perspective almost boggles my mind. I can't drive more than a mile before it turns to junk with cracks, holes and bad patchjobs (effectively creating speedbumps).

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Old 09-14-2008, 05:33 PM   #4 (permalink)
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Old 09-14-2008, 09:46 PM   #5 (permalink)
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So this is all just coasting ?
Also, I wonder how he brakes in an emergency.
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Old 09-14-2008, 09:56 PM   #6 (permalink)
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How does one practice to do this? Did he know that he could make those turns? UFB!
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Old 09-14-2008, 10:11 PM   #7 (permalink)
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This is the first time I've seen this and I must say it is pretty intense. One bad bearing and he is done though...
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Old 09-14-2008, 10:41 PM   #8 (permalink)
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Assuming under emergency situations I don't think stopping would be smart. I would assume you would either speed up or maintain a constant speed and try to avoid the incident or go underneath it, but if you had to stop you would increase you frontal area by using your torso as a parachute.
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Old 09-15-2008, 02:15 PM   #9 (permalink)
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This looks basically like extreme rollerblading. He's slaloming to bleed speed just like you do with rollerblades and that's worst part of it, there is not emergency stopping, or turning for that matter. You have so much momentum and so little surface area in contact, that only small adjustments are possible. This looks like the most thrilling thing I've ever seen! I'm sure he's done this stunt before he video taped it. I'm impressed at just how fast he accelerates as soon as puts his arms back. I've skated several times with a blown bearing and it doesn't do anything other than act as a brake. My problem with this is he would burn up wheels really fast, and one or two of those going out could be a problem, but even if they just wear down gradually like they're supposed to, you'd only get 100 miles out of a set tops, and he must have a couple dozen on his outfit.

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Old 09-15-2008, 04:08 PM   #10 (permalink)
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Now with Mr. Rollerman explaining his technique:

If the video doesn't work, copy this code and paste it in browser, deleting the two spaces in 'http' and 'youtube':

h ttp://es.you tube.com/watch?v=LWLbu1wIIEo


Last edited by TELVM; 09-15-2008 at 04:21 PM..
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