Barrel roll
in [Aussie Drivers]
|
From: Atheist Chaplain on 19 Jun 2010 06:44 "Doug Jewell" <ask(a)and.maybe.ill.tell.you> wrote in message news:T6-dnfxJC_Smt4bRnZ2dnUVZ_o-dnZ2d(a)westnet.com.au... > 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? one name Bob Hoover http://www.youtube.com/watch?v=Xp2Uc9XvmjY -- [This comment is no longer available due to a copyright claim by Church of Scientology International] "I like your Christ. I do not like your Christians. They are so unlike your Christ." Gandhi
From: Doug Jewell on 19 Jun 2010 07:52 Atheist Chaplain wrote: > "Doug Jewell" <ask(a)and.maybe.ill.tell.you> wrote in message > news:T6-dnfxJC_Smt4bRnZ2dnUVZ_o-dnZ2d(a)westnet.com.au... >> 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? > > one name > Bob Hoover > http://www.youtube.com/watch?v=Xp2Uc9XvmjY And you'd be able to do a similar thing in the car too. At all times the G forces with respect to your bum will remain positive, so you could pour a cup of tea. If the force ceased to be positive, would fall off. It is the magnitude of the forces that changes, going from around 2G at the start of the turn, to near 0G at the top, back up to 2G at the end. If you do the turn at faster than minimum speed, those forces will be increased, but you will still have a 2G difference. If you have ever experienced a 2G force (and most people haven't) you will know why I say that I can guarantee you will notice it. > -- What is the difference between a duck?
From: veritas on 19 Jun 2010 08:26 On 19/06/2010 8:44 PM, Atheist Chaplain wrote: >>> 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. Oh I see - we have changed to a Barrel Roll entry from a barrel roll itself. A blindfolded pax would feel an initial unusual manoeuvre but sorry - I ain't gunna swallow the guff you are pedalling. He wouldn't have a clue what was going on. Try flying with a smooth experienced pilot - Hoover being the best - but they wouldn't have to be near his calibre. Have you ever been seriously examined for recovery from an IFR unusual attitude under the hood? Any candidate, with his eyes closed when required wouldn't have a clue what is going on until the appropriate control handling and instrument interpretation is performed. A pax (not the examiner) would not have a clue. Where did you get your opinion?
From: Mickel on 19 Jun 2010 19:19 On 17/06/10 4:18 PM, Noddy wrote: > 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 ;) Actually the weight of the car is irrelevant. As doug said Centripetal force = mV2/r gravitational force = mG The m on each side of the equation would cancel each other out. Michael
From: hippo on 20 Jun 2010 08:16
Noddy wrote: > > > "hippo" <am9obmhAc2hvYWwubmV0LmF1(a)REGISTERED_USER_usenet.com.au> wrote in > message news:hvhsoq$rqf$1(a)news.eternal-september.org... > > > Which particular one did you have in mind? > > :D > > All of them :) > > -- > Regards, > Noddy. > > > > Could be interesting times then - he did promise to serve out his full term! -- Posted at www.usenet.com.au |