E
Eiron
Guest
Don Pearce wrote:
> On Sat, 08 Sep 2007 08:42:58 +0100, Eiron <[email protected]> wrote:
>
>> Andre Jute wrote:
>>
>>> Those brakes aren't dodgy, Don, they're hyper-competent; what I forgot
>>> to add is that they have a built-in modulator. They stop the one-
>>> eighth of a ton of me and the bike and light touring gear from thirty
>>> kph in 11 feet. I know, because I chewed up a pair of tyres while I
>>> practiced that one to perfection. But I agree with you, for casual use
>>> those roller brakes are overkill.
>> A fat man on a granny bike braking at over 1g!
>> Don't the laws of physics apply in Eire these days?
>
> Quite so. That comes out at 1.05g. Centre of mass combined with
> wheelbase tell us that he performed the last 8 feet of that stop flat
> on his face in the road. But that is a perfectly legitimate way of
> stopping your bike.
I just tried a normal stop from 20mph on decent tarmac. It took 12 yards
which averages 0.37g, and the back wheel was hopping about. I expect 0.5g
would be a reasonable maximum if I moved down and back, or a bit more if
I wasn't so fat. Perhaps André meant 11 yards, or perhaps he's just won
another thousand euros after betting that someone would point out the
deliberate error.
--
Eiron.
> On Sat, 08 Sep 2007 08:42:58 +0100, Eiron <[email protected]> wrote:
>
>> Andre Jute wrote:
>>
>>> Those brakes aren't dodgy, Don, they're hyper-competent; what I forgot
>>> to add is that they have a built-in modulator. They stop the one-
>>> eighth of a ton of me and the bike and light touring gear from thirty
>>> kph in 11 feet. I know, because I chewed up a pair of tyres while I
>>> practiced that one to perfection. But I agree with you, for casual use
>>> those roller brakes are overkill.
>> A fat man on a granny bike braking at over 1g!
>> Don't the laws of physics apply in Eire these days?
>
> Quite so. That comes out at 1.05g. Centre of mass combined with
> wheelbase tell us that he performed the last 8 feet of that stop flat
> on his face in the road. But that is a perfectly legitimate way of
> stopping your bike.
I just tried a normal stop from 20mph on decent tarmac. It took 12 yards
which averages 0.37g, and the back wheel was hopping about. I expect 0.5g
would be a reasonable maximum if I moved down and back, or a bit more if
I wasn't so fat. Perhaps André meant 11 yards, or perhaps he's just won
another thousand euros after betting that someone would point out the
deliberate error.
--
Eiron.