From: jonz on
On 6/17/2010 12:32 PM, Brad wrote:
> "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.
> ~~~~~~~~~~~~~~~~~~~~~~~~~
Yeah, globe of death, and wall of death......awe inspiring to a young
kid (me)....they used to appear at ag. shows etc., prolly on the oh+s
black list now......


--
jonz
"Usenet is like a herd of performing elephants with diarrhea - massive,
difficult to redirect, awe-inspiring, entertaining, and a source of mind
- boggling amounts of excrement when you least expect it." - Gene
Spafford,1992
From: Fraser Johnston on

"jonz" <fj40(a)deisel.com> wrote in message news:4c198ba1(a)dnews.tpgi.com.au...
> On 6/17/2010 12:32 PM, Brad wrote:
>> "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.
>> ~~~~~~~~~~~~~~~~~~~~~~~~~
> Yeah, globe of death, and wall of death......awe inspiring to a young kid
> (me)....they used to appear at ag. shows etc., prolly on the oh+s black list
> now......

I saw a ball of death at a circus last year with 5 guys on motorbikes.

Fraser


From: atec7 7 ""atec77" on
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
>>> 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 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?
>
> Mark
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
From: Mark Walford on
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
>>>> 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 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?
>>
>> Mark
> 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?

http://www.youtube.com/watch?v=-TbpgZ2Dt0A&feature=player_embedded

Mark
From: atec7 7 ""atec77" on
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
>>>>> 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 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?
>>>
>>> Mark
>> 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?
>
> http://www.youtube.com/watch?v=-TbpgZ2Dt0A&feature=player_embedded
>
> Mark
Yes
he ravelled just on the minimum ?
hence a safe margin is required making it very possible
I saw someone try it once and fail > messy