Once upon a time on usenet Darryl Johnson wrote:
> On 2018-02-02 7:16 PM, ~misfit~ wrote:
>> Once upon a time on usenet alister wrote:
>>> On Fri, 02 Feb 2018 11:55:34 +1300, ~misfit~ wrote:
>>>> Once upon a time on usenet larkim wrote:
>>>>> On Wednesday, 31 January 2018 07:38:21 UTC, ***@gmail.com
>>>>>> And I reckon that car's a looker.
>>>>> We're getting closer to the Batmobile every year...
>>>>> Not saying I hate it, but it is taking racing cars in a new
>>>> I find it odd that they have large wheels yet (relatively) small
>>>> brake discs. Perhaps those discs are already enough to reach the
>>>> limits of the tyres? (Though I'd think that larger discs would give
>>>> more constant temperatures and better feel making it easier to not
>>>> snatch a wheel...)
>>> Unless i am mistaken Formula E has regenerative breaking (KERS) to
>>> recharge the batteries.
>> You're not mistaken.
>>> as such it would need smaller brake disks as physical breaking would
>>> reduce this recharge and throw energy away.
>> True to a point. However as most overtakes are carried out under
>> braking it makes sense to me to have really good discs on the front
>> (where there is no regenerative braking as yet) to be able to brake
>> late and pass. Usually track position is worth more than a small
>> amount of extra power you'd lose (which wouldn't be anywhere near
>> enough to facilitate a pass under power). Having discs that only fill
>> half of the available space in the wheel
>> rim in a serious racing series just seems wrong.
> One might be safe in assuming that the car designers/engineers have
> made the brakes as large as they need to be. To have brakes larger
> just for looks, to fill more of the available space, as it has been
> suggested, might merely add more weight. Brakes used to be unsprung
> weight, which has traditionally be considered a bad thing, as far as
> performance goes. I do not know if modern F1/Formula E brakes are
> still unsprung, nor if unsprung weight is still considered to be bad.
Yep. If they're outboard of the suspension then they're 'unsprung'. The
usual way to get past this issue is how Jaguar did with their rear transaxle
of several deacdes ago that had the brake discs on the other end of the
driveshafts, right next to the diff.
Did you see Lotterer run out of brakes and have to use his team mates brakes
to stop in yesterdays race? I'd say that if he had larger discs (more
friction area) he'd have been able to brake in a much more controlled
"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)