Old 35 mm movie of San Francisco
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From: Lee on 27 Apr 2010 05:33 On Tue, 27 Apr 2010 19:20:07 +1000, Nev.. <idiot(a)mindless.com> wrote: > On 27/04/2010 6:53 PM, Lars Chance wrote: > >> The fact that he was turning when he collided with them tends to >> indicate that speed *wasn't* much of a factor (hard to speed around >> right-angle corners on a pushie) > > Really? I thought cornering speed was a function of weight, among other > variables. Compare the speed which 125cc bikes carry through corners > compared to MotoGP bikes as an illustration. > cornering speed is a function of grip, which is entirely down to the coefficient of friction between the tyre and the road, limited by how far over you can lean the bike / how far over you can get the centre of gravity of the bike/rider combination. You should be able to lean a road pushbike on grippy rubber a fair way over, so you should be able to get around corners pretty quick. Has almost nothing to do with weight, the extra sideways force from momentum is exactly countered by the extra grip from the extra mass. Which is why they put wings on F1 cars - extra grip without using stickier rubber (that won't last as long) -- Lee
From: Andrew on 28 Apr 2010 03:12 On Tue, 27 Apr 2010 09:30:05 +0000, Lars Chance wrote: > > They don't have to leave clearance for the pedalling! You go really fast round corners on a pushie by coasting with the inside pedal raised to the top - massively more clearance than any motorcycle on the planet. Where on earth did you go to school that you didn't learn that? -- Regards Andrew
From: Andrew on 28 Apr 2010 03:16 On Tue, 27 Apr 2010 19:20:31 +1000, F Murtz wrote: > Yes they should not have crossed the crossing when the lights were > green. If you read what Kev actually wrote, rather than what he implied, you'll see that nowhere does he say the pedestrian lights were green. If they were, since you never have a Walk / Don't Walk without a matching set of traffic lights, the cyclist went through a red light. -- Regards Andrew
From: Nev.. on 28 Apr 2010 03:28 On 27/04/2010 7:30 PM, Lars Chance wrote: > Nev.. wrote: >> On 27/04/2010 6:53 PM, Lars Chance wrote: >> >>> The fact that he was turning when he collided with them tends to >>> indicate that speed *wasn't* much of a factor (hard to speed around >>> right-angle corners on a pushie) >> >> Really? I thought cornering speed was a function of weight, among >> other variables. Compare the speed which 125cc bikes carry through >> corners compared to MotoGP bikes as an illustration. >> > They don't have to leave clearance for the pedalling! I reckon bicycles have much more cornering clearance than any GP bike. Nev.. '08 DL1000K8
From: Kevin Gleeson on 28 Apr 2010 04:09
On Wed, 28 Apr 2010 07:16:15 GMT, Andrew <amckNOSPAM3047(a)telNOSPAMstra.com> wrote: >On Tue, 27 Apr 2010 19:20:31 +1000, F Murtz wrote: > >> Yes they should not have crossed the crossing when the lights were >> green. > >If you read what Kev actually wrote, rather than what he implied, you'll >see that nowhere does he say the pedestrian lights were green. If they >were, since you never have a Walk / Don't Walk without a matching set of >traffic lights, the cyclist went through a red light. He was turning from a street with a green light with pedestrians having an associated green as well. But I cannot recall whether there was a red arrow at the intersection for a right turn. I don't think so. But he still has to wait for the pedestrians. Kev |