From: George W Frost on 17 Jun 2010 07:42
"Noddy" <me(a)home.com> wrote in message
> "George W Frost" <georgewfrost(a)gmail.com> wrote in message
>> He did that at a speed of 37.5 mph and only just made the roll with thet
>> last bit a bit on the suss side
> Where you watching the same clip?
> It didn't get anywhere *near* making the roll, with the car having three
> of it's four wheels off the "deck" before it'd made 180 degrees. It fell
> the rest of the way and bounced back up.
That's what I meant when I said the last bit being a bit suss
he fell the last bit
> For the car to maintain contact all the way around and *not* crash like
> that one did it needs enough downforce to overcome the weight of the car
> hanging upside down from the ceiling. Speed, in and of itself, won't do
> that when you're going in a straight line like he was, as you can't "turn"
> the car on enough of an angle to impart enough force stop the car falling
> Given a wide enough tunnel *and* sufficient speed where you could turn the
> car sharply to make it climb up the wall you *might* be able to do it, but
> the car would want to be incredibly light and have a decent roll cage ;)
From: George W Frost on 17 Jun 2010 07:44
"D Walford" <dwalford(a)internode.on.net> wrote in message
> On 17/06/2010 2:06 PM, Mark Walford wrote:
>> On 17/06/2010 1:43 PM, atec7 7 > wrote:
>>> Mark Walford wrote:
>>>> On 16/06/2010 12:41 PM, Doug Jewell wrote:
>>>>> George W Frost wrote:
>>>>>> "Diesel Damo" <Diesel_4WD(a)yahoo.com.au> wrote in message
>>>> What about the potential energy stored in the cars suspension as it
>>>> begins the monuever? Compressed by the ramp and then released as the
>>>> car turns over. Shouldnt the suspension push the car away from the
>>>> roof regardless of its speed?
>>> Of course it does but the figures supplied more than compensate when you
>>> realise the minimum speed is quite slow in relation to the estimated in
>>> the clip hence a safety margin and a bit
>> Fair enough.
>> You've seen this?
> Now I know what you do at work all day:-)
So is Mark your little boy
and this is where the profits are going?>
From: veritas on 17 Jun 2010 23:46
On 17/06/2010 12:32 PM, Brad wrote:
> Nope, because of the whole close to negative at the top and transitioning to
> close to 2G at the bottom the speed changes would have to be dramatic to be
> otherwise. I would have loved to have a go at one of those motorbike ball
> thingos that were popular when I was younger.
I say again: Properly performed, close your eyes and you would never
know it was happening.
From: Noddy on 18 Jun 2010 00:06
"veritas" <veritas(a)ghntk.com> wrote in message
> I say again: Properly performed, close your eyes and you would never know
> it was happening.
Yeah you would.
You'd feel the force necessary to hold the car against the ceiling just as
you would feel the change in attitude if you were a passenger in a car with
your eyes closed that suddenly shot up a steep hill.
From: Doug Jewell on 18 Jun 2010 04:11
> On 17/06/2010 12:32 PM, Brad wrote:
>> Nope, because of the whole close to negative at the top and
>> transitioning to
>> close to 2G at the bottom the speed changes would have to be dramatic
>> to be
>> otherwise. I would have loved to have a go at one of those motorbike ball
>> thingos that were popular when I was younger.
> I say again: Properly performed, close your eyes and you would never
> know it was happening.
Bollocks. near 2G at the start and finish, changing to near
0G at the top - if you don't notice that you need to check
into the nearest morgue.
Most people don't normally get to experience 2G - about the
only time you might is on some rollercoasters. I can
guarantee you would notice it, even with your eyes shut.
What is the difference between a duck?