Barrel roll
in [Aussie Drivers]
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From: John McKenzie on 17 Jun 2010 00:37 Fraser Johnston wrote: > > > I saw a ball of death at a circus last year with 5 guys on motorbikes. circa 1987 in china (if you think they give no fark for workers safety now, back then it was scary) I saw them in a small gokart/clownn car thing - 2 aboard, driving in the globe thing. Couldn't fucken believe what I was seeing. Couldn't stop laughing. -- John McKenzie tosspam(a)aol.com abuse(a)yahoo.com abuse(a)hotmail.com abuse(a)earthlink.com abuse(a)aol.com vice.president(a)whitehouse.gov president(a)whitehouse.gov sweep.day(a)accc.gov.au uce(a)ftc.gov admin(a)loopback abuse(a)iprimus.com.au $LOGIN(a)localhost I knew Sanchez before they were dirty root(a)mailloop.com $USER@$HOST $LOGNAME(a)localhost -h1024(a)localhost abuse(a)msn.com abuse(a)federalpolice.gov.au fraudinfo(a)psinet.com abuse(a)asio.gov.au $USER(a)localhost abuse(a)sprint.com abuse(a)fbi.gov abuse(a)cia.gov
From: George W Frost on 17 Jun 2010 01:15 "Mark Walford" <mjwalf(a)kramit.com.au> wrote in message news:4c199f44$1(a)dnews.tpgi.com.au... > On 17/06/2010 1:43 PM, atec7 7 > wrote: >> Mark Walford wrote: >>> On 16/06/2010 12:41 PM, Doug Jewell wrote: >>>> George W Frost wrote: >>>>> "Diesel Damo" <Diesel_4WD(a)yahoo.com.au> wrote in message >>> Mark >> Of course it does but the figures supplied more than compensate when you >> realise the minimum speed is quite slow in relation to the estimated in >> the clip hence a safety margin and a bit > Fair enough. > > You've seen this? > > http://www.youtube.com/watch?v=-TbpgZ2Dt0A&feature=player_embedded > > Mark He did that at a speed of 37.5 mph and only just made the roll with thet last bit a bit on the suss side so, if a car was going at twice that speed, or at the speed of the Mercedes, around 120 mph, then it would do it easy
From: Noddy on 17 Jun 2010 02:18 "George W Frost" <georgewfrost(a)gmail.com> wrote in message news:0ciSn.3095$Ls1.3008(a)news-server.bigpond.net.au... > 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. > so, if a car was going at twice that speed, or at the speed of the > Mercedes, around 120 mph, then it would do it easy 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 over. 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 ;) -- Regards, Noddy.
From: D Walford on 17 Jun 2010 03:38 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 >>>>> 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 > Now I know what you do at work all day:-) Daryl
From: GrassyNoel on 17 Jun 2010 04:09
On Jun 16, 12:04 pm, Toby <m...(a)privacy.net> wrote: > Well, ANY aircraft capable of level flight can pull a barrel roll. A balloon can't :) |