Barrel roll
in [Aussie Drivers]
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From: George W Frost on 17 Jun 2010 07:42 "Noddy" <me(a)home.com> wrote in message news:4c19bfb2$0$78837$c30e37c6(a)exi-reader.telstra.net... > > "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. 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 > 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: George W Frost on 17 Jun 2010 07:44 "D Walford" <dwalford(a)internode.on.net> wrote in message news:4c19d113$0$28643$c3e8da3(a)news.astraweb.com... > 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? >>>> >>>> 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 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 news:hveq7g$d41$1(a)speranza.aioe.org... > 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. -- Regards, Noddy.
From: Doug Jewell on 18 Jun 2010 04:11
veritas wrote: > 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? |