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- Newsgroups: rec.motorcycles
- Path: sparky!uunet!pmafire!news.dell.com!swrinde!zaphod.mps.ohio-state.edu!uunet.ca!ohrd!jlevine
- From: jlevine@rd.hydro.on.ca (Jody Levine)
- Subject: Re: What would you ride on a long distance trip?
- Message-ID: <1992Nov19.165638.8726@rd.hydro.on.ca>
- Organization: Ontario Hydro - Research Division
- References: <Bxw183.92L@news.iastate.edu> <1992Nov18.020307.19538@tcsi.com> <BxxoMr.F6@news.iastate.edu>
- Date: Thu, 19 Nov 92 16:56:38 GMT
- Lines: 31
-
- In article <BxxoMr.F6@news.iastate.edu> tomes@iastate.edu () writes:
- >In article <1992Nov18.020307.19538@tcsi.com> markk@tcs.com (Mark Kromer)writes:
- >
- >Ok, I used the wrong term (polar moment). But show me how an object
- >can pivot about a point above the ground and still remain in contact with
- >the ground (assume point touching the ground is the point farthest away
- >from the CG in that immediate part of the object eg contact patch).
- >The instantaneous roll axis for a singletrack vehicle MUST be the
- ^^^^^^^^^^^^^
- true, but...
-
- >line between the two contact patches; otherwise the bike is off the ground
- >by definition.
-
- Never forget, even for an instant, that you're going forward as well. The
- bike is not stuck to one spot on the ground! When I initiate a lean, the
- centre of mass continues along in the same direction before the turn actually
- starts. The weels roll *out*, the head tilts *in* but the centre of mass
- continues in the same line. If you're an observer moving with the bike,
- it feels like the bike's rotation in the plane of the lean is about the
- centre of mass.
-
- Try this at home. Go around potholes with your wheels, but straight over them
- with your body.
-
- So if you lean to turn and speed up, you rotate on all three axes (lean,
- turn & wheelie) at the same time!
-
- I've bike like | Jody Levine DoD #275 kV
- got a you can if you -PF | Jody.P.Levine@hydro.on.ca
- ride it | Toronto, Ontario, Canada
-