A paradoxical thought experiment
in [Motorcycles]
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From: tomorrow on 8 Jul 2010 14:42 On Jul 7, 7:49 pm, "?" <breoganmacbr...(a)yahoo.com> wrote: > On Jul 7, 2:14 pm, sean_q_ <nos...(a)no.spam> wrote: > > > When I was in grade school I used to bicycle over to what is now > > the Calgary International Airport and play around in the cockpit > > of this partly disassembled prop plane, working the controls > > and making piston-driven vroom vroom sounds. No one took any > > notice or bugged me in the least until the day a mean lady > > came by and ordered me out of the thing in a nasty way, > > implying that she was the owner. (Don't some people have > > any childhoods?) > > Actually, you could have screwed up a control and put the owner or > pilot's life in jeopardy Learn to read: "partly disassembled prop plane."
From: tomorrow on 8 Jul 2010 14:45 On Jul 7, 10:36 pm, "Beauregard T. Shagnasty" <a.nony.m...(a)example.invalid> wrote: > Ben Kaufman wrote: > > When the sidecar wheel is off the ground you have a two wheel > > motorcycle steering dynamics. > > No, I'm afraid not. :-) > > Solo: counter-steer > Sidecar: steer BZZZT. Wrong. Having "flown" the car on both sidecar rigs I've owned, once the sidecar is in the air, and as long as it is in the air, the motorcycle steers via counter-steering (albeit quite awkwardly). It should be intuitively obvious, bit if it isn't to you, just try it - it will be very obvious upon practical application.
From: Twibil on 8 Jul 2010 14:47 On Jul 8, 11:05 am, Mark Olson <ols...(a)tiny.invalid> wrote: > > > A riderless bike will happily stay upright so long as it is moving. > Put a throttle lock on it and give it open space and it will go > until it runs out of gas. Only on some ideal -but unreal- perfectly flat surface that extends forever. In real life, on real roads, a riderless bike will fall over rather quickly.
From: Henry on 8 Jul 2010 14:54 Twitbull imagined: > In real life, on real roads, a riderless bike will fall over rather > quickly. Wow. Poor twit. Even the obvious, simple things in life, he can't understand. Earth to twit - many people, including myself have seen bikes roll along without a rider for considerable distances. -- "Condemnation without investigation is the height of ignorance." -- Albert Einstein. http://911research.wtc7.net http://www.journalof911studies.com/ http://www.ae911truth.org
From: Mark Olson on 8 Jul 2010 14:59
Twibil wrote: > On Jul 8, 11:05 am, Mark Olson <ols...(a)tiny.invalid> wrote: >> >> A riderless bike will happily stay upright so long as it is moving. >> Put a throttle lock on it and give it open space and it will go >> until it runs out of gas. > > Only on some ideal -but unreal- perfectly flat surface that extends > forever. > > In real life, on real roads, a riderless bike will fall over rather > quickly. Sure, if the throttle closes it will slow down and fall over. Bikes don't stay up because of rider input. They stay up because they are dynamically stable. Where did you come up with the idea that bikes need a perfectly flat surface to avoid falling over? Sure, if you don't have someone controlling the bike, and the surface the bike is on is not open as I said, eventually it will run into something. But it definitely doesn't have to be perfectly flat and level. |