[python] Re: Ice python and ice races

  • From: Ray Schumacher <mtb@xxxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Thu, 23 Feb 2006 20:45:37 -0800

I see
http://media.exn.ca/exnmedia/exn20060222-icebike.wmv
is the direct URL.
Nice references to the Python; "agile", "fastest" etc!
And he looked good, pulling out at the start of the 10 minute race.

Ray

At 06:56 PM 2/23/2006, you wrote:
When we did the ice racing, Discovery Channel wanted to film it.  I missed
it when it was on TV, but here's the video segment of it:
http://www.exn.ca/dailyplanet/view.asp?date=2/22/2006

Marcel is there with his ice python and there's a couple shots of me with
the tilting delta python.  Marcel was really flying on his python . .
.again, but the combination of the hard ice and the LONG sharp blade we
ground meant that he was REALLY eating up the ice when he cornered :)  We
also raced the next weekend in Toronto but I took the Sabre (ice trike)
instead of the python.


> Hi Tim, > > just read the impressive ice-race report on your site: > > http://bikes.jkcc.com/python%20clone.htm > > Too bad that the tire of Marcel went flat. I understood that he > would have won the race otherwise. > > Here is the text for those who are interested: > > ============================================= > > So, how well did it work? Well, as you can see in the picture, he appears > to be zipping along fairly well as he's setting himself up to go into the > corner. In fact he went extremely well, and generally faster than most of > the three wheelers there. Traction on the front wheel was great and the > only problem he had was not being able to get enough bite with his rear > blade, even though it had a pretty wicked edge ground on it, and polished > with a whet stone. In the 2 man pursuit races, he got so much speed in his > first heat, that the rear end slid out on a corner unfortunately, and he > went down. In the slaloms, his masterful riding control enabled him to whip > the python around the cones by sliding out the rear end slightly, and he > beat all but the fastest two or three trikes. In the 10 minute criterium > race, he was cruising around, and lapping other riders, and well on his way > to a podium finish when one of his tire screws somehow managed to cause a > flat and he momentarily lost control and hit the boards pretty hard. He got > right up and back on, and finished out the race on a flat for the last few > minutes and still managed a 4th overall (I think). Overall, it was an > amazing effort for such an extreme bent and the biggest part of the success > was due to Marcel's riding ability. > > As for the traction issues on the rear end, I think that was due to two > reasons. I think the largest part of the problem is how the python turns. > On a normal bike, the rear wheel gets pulled through the corner and follows > a line inside the front wheel's track, and has a fair bit of weight on it - > likely close to 50%. The python rear end doesn't follow, but rather it > "turns" through the corner on its own path and as a result, I don't think it > puts down nearly the same force as a normally steered bike does. I know > that Marcel and I could easily slide the rear wheel out on dry pavement by > turning hard and at speed. Now take that same force, and try to turn hard > with a blade on ice that can chip away under heavy loading, and I think that > is part of why the python rear end was weak at fast cornering. Add to that, > the fact that as the ice got chewed up from the racing, the blade was > tracking across rough ice on the corners and further minimizing its traction > every time it encounterd crossing multiple ice grooves, and it lost even > more traction. Even though the rear end would start sliding, Marcel quickly > mastered the art of letting the rear end do a power slide, while he kept the > power on and deftly used his left hand as an outrigger on the hard turns. > It was amazing to watch him rip up the corners right on the edge of > disaster, lap after lap, after lap :) > > Anyway, the ice python did an excellent job at the ice races, and I > think it would definitely be tough to beat on larger tracks with larger > radius corners. In the mean time, it'll get converted back to a "normal" > python, and he was talking about possibly selling it.

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