From: Doug Jewell on
George W Frost wrote:
> "Diesel Damo" <Diesel_4WD(a)yahoo.com.au> wrote in message
> news:9394786d-5657-4b41-a1cb-b3c7ad5c9104(a)23g2000pre.googlegroups.com...
> On Jun 15, 10:57 pm, "George W Frost" <georgewfr...(a)gmail.com> wrote:
>> "Clocky" <notg...(a)happen.com> wrote in message
>>
>> news:4c1770ac$0$28671$c3e8da3(a)news.astraweb.com...
>>
>>> George W Frost wrote:
>>>> This youtube video depicts a Mercedes 2011 Gull wing roadster doing a
>>>> barrel roll through a tunnel in Fraser Canyon British Columbia Canada
>>>> http://www.youtube.com/watch?v=ihaSDlGOTn4
>>> Pity it's not real.
>> Just because you can't drive, doesn't mean that it is a fake
>
> Hahaha. Oh man, I was going to reply to Clocky saying that I didn't
> think that needed to be pointed out, but here's you eating it up with
> a big spoon. Jesus you're thick LOL.
>
>
> **************************
>
> There has been checks on this via the web and snopes and any other sources
> and there has to date, been nothing to indicate that it is a hoax.
> Bringing to mind, a toy
>
> Yes, a toy, a toy car racing set, which has loop the loop and barrel rolls
> in the track,
> these toys do not fall out of the sky when performing the tricks
> So, why can't a bigger car do the same ?
> A 6 cylinder 130 HP airplane can do barrel rolls at 200kph,
> so why not a V12 600 HP powered car ?

Using a bit of maths...
Centripetal force = mV^2/r
gravitational force = mG
these two must cancel out
so mG = mV^2/r
solving for V
V= SQRT(G x r)
which will give the minimum ANGULAR velocity that the
vehicle must travel around the curve in.
at a very rough guess I'd say the radius of the curve to be
4m which means
V=SQRT(9.8 x 4) = 6.26 m/s

a circle of 4m radius has a circumference of 25.12m
which at 6.26m/s would take 4sec to complete. Therefore if
the car does the loop in less than 4 sec, it won't fall.

Now, that is for a perfectly round tunnel, which this isn't
- because this is elliptical the effective radius at the top
is larger, requiring a higher angular velocity.

But I would have to say though, that what the video shows is
certainly possible.
>
>


--
What is the difference between a duck?
From: Toby on
On Wed, 16 Jun 2010 00:01:59 GMT, George W Frost wrote:

> "Diesel Damo" <Diesel_4WD(a)yahoo.com.au> wrote in message
> news:9394786d-5657-4b41-a1cb-b3c7ad5c9104(a)23g2000pre.googlegroups.com...
> On Jun 15, 10:57 pm, "George W Frost" <georgewfr...(a)gmail.com> wrote:
>> "Clocky" <notg...(a)happen.com> wrote in message
>>
>> news:4c1770ac$0$28671$c3e8da3(a)news.astraweb.com...
>>
>>> George W Frost wrote:
>>>> This youtube video depicts a Mercedes 2011 Gull wing roadster doing a
>>>> barrel roll through a tunnel in Fraser Canyon British Columbia Canada
>>
>>>>http://www.youtube.com/watch?v=ihaSDlGOTn4
>>
>>> Pity it's not real.
>>
>> Just because you can't drive, doesn't mean that it is a fake
>
> Hahaha. Oh man, I was going to reply to Clocky saying that I didn't
> think that needed to be pointed out, but here's you eating it up with
> a big spoon. Jesus you're thick LOL.
>
>
> **************************
>
> There has been checks on this via the web and snopes and any other sources
> and there has to date, been nothing to indicate that it is a hoax.
> Bringing to mind, a toy
>
> Yes, a toy, a toy car racing set, which has loop the loop and barrel rolls
> in the track,
> these toys do not fall out of the sky when performing the tricks
> So, why can't a bigger car do the same ?
> A 6 cylinder 130 HP airplane can do barrel rolls at 200kph,
> so why not a V12 600 HP powered car ?

Well, ANY aircraft capable of level flight can pull a barrel roll.
It's a 1 G manoeuvre executed correctly. We'll leave out those triumphs of
ingenuity over practicality AKA Helicopters - though most should be able to
comply. But, the lift provided to the aircraft is NOT in any way the same
as the lift provided to a car - that's the jobbie of the ground. IOW, it
isn't the speed of the machine during the roll that counts provided it's
same-same as level flight or close to it. A loop is different.
Which is why I didn't even look at the video:-)


--
Toby.
Caveat Lector
From: Diesel Damo on
On Jun 16, 12:34 pm, D Walford <dwalf...(a)internode.on.net> wrote:
> On 16/06/2010 10:30 AM, Diesel Damo wrote:
>
>
>
>
>
> > On Jun 16, 10:01 am, "George W Frost"<georgewfr...(a)gmail.com>  wrote:
> >> "Diesel Damo"<Diesel_...(a)yahoo.com.au>  wrote in message
>
> >>news:9394786d-5657-4b41-a1cb-b3c7ad5c9104(a)23g2000pre.googlegroups.com....
> >> On Jun 15, 10:57 pm, "George W Frost"<georgewfr...(a)gmail.com>  wrote:
>
> >>> "Clocky"<notg...(a)happen.com>  wrote in message
>
> >>>news:4c1770ac$0$28671$c3e8da3(a)news.astraweb.com...
>
> >>>> George W Frost wrote:
> >>>>> This youtube video depicts a Mercedes 2011 Gull wing roadster doing a
> >>>>> barrel roll through a tunnel in Fraser Canyon British Columbia Canada
>
> >>>>>http://www.youtube.com/watch?v=ihaSDlGOTn4
>
> >>>> Pity it's not real.
>
> >>> Just because you can't drive, doesn't mean that it is a fake
>
> >> Hahaha. Oh man, I was going to reply to Clocky saying that I didn't
> >> think that needed to be pointed out, but here's you eating it up with
> >> a big spoon. Jesus you're thick LOL.
>
> >> **************************
>
> >> There has been checks on this via the web and snopes and any other sources
> >> and there has to date, been nothing to indicate that it is a hoax.
> >> Bringing to mind, a toy
>
> >> Yes, a toy,  a toy car racing set, which has loop the loop and barrel rolls
> >> in the track,
> >> these toys do not fall out of the sky when performing the tricks
> >> So, why can't a bigger car do the same ?
> >> A 6 cylinder 130 HP airplane can do barrel rolls at 200kph,
> >> so why not a V12 600 HP powered car ?
>
> > There are numerous indicators that it's a fake, but consider just this
> > one. If they did manage such a stunt with a car like that, why did
> > they not capture it in it's full glory with a single camera angle that
> > shows the whole loop, not just fleeting cut-to-cut shots that show
> > practically nothing at all?
>
> > It's like saying "I caught a fish THIS BIG, but I only took separate
> > photos - 1 close up of the tail, 1 close up of the eye, and 1 close up
> > the gills." No, if you caught a fish "this big" you would take a full
> > shot of it, and probably next to something that makes it easy to
> > compare the size of it.
>
> > I think that's pretty damning even without getting technical about it.
>
> I thought it was a fake when I saw it but it would be possible if the
> tunnel was completely round and there was nothing hanging from the
> ceiling like there is in every road tunnel I've ever been in, the
> chances of missing the signs, fire sprinklers, lights and cameras etc
> would be nil.
>

Oh don't get me wrong, I'm not dismissing it based on "that can't be
possible". I'm sure it has been done before under careful conditions
(such as you described) and with a vehicle that has been designed with
this stunt in mind. Imagine the downward g-forces on the car in order
to do it as tightly and quickly as to not fall off the ceiling. You'd
want some seriously modded suspension to handle that at least.
From: veritas on
On 17/06/2010 8:42 AM, Diesel Damo wrote:

> Oh don't get me wrong, I'm not dismissing it based on "that can't be
> possible". I'm sure it has been done before under careful conditions
> (such as you described) and with a vehicle that has been designed with
> this stunt in mind. Imagine the downward g-forces on the car in order
> to do it as tightly and quickly as to not fall off the ceiling. You'd
> want some seriously modded suspension to handle that at least.

Properly performed, close your eyes and you would never know it was
happening.

From: Brad on

"veritas" <veritas(a)ghntk.com> wrote in message
news:hvbmmj$ujk$1(a)speranza.aioe.org...
: On 17/06/2010 8:42 AM, Diesel Damo wrote:
:
: > Oh don't get me wrong, I'm not dismissing it based on "that can't be
: > possible". I'm sure it has been done before under careful conditions
: > (such as you described) and with a vehicle that has been designed with
: > this stunt in mind. Imagine the downward g-forces on the car in order
: > to do it as tightly and quickly as to not fall off the ceiling. You'd
: > want some seriously modded suspension to handle that at least.
:
: Properly performed, close your eyes and you would never know it was
: happening.
:

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.

--
Brad Leyden
6� 43.5816' S 146� 59.3097' E WGS84
To mail spam is really hot but please reply to thread so all may benefit (or
laugh at my mistakes)
>
>