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20 May 2024 14:15

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Question

Asked by: Doug Babbitt
Subject: motorcycle engine/transmission as a gyroscope
Question: The gyroscopic effect of motorcycle wheels has been much discussed. I have wondered about the effect that the rotating parts of the engine and transmission have on the motorcycle. The rotation is perpendicular to the line of travel (transverse mounted?). In particular, what would be the effect if the center of mass of the transmission, for example, were somewhat off center? Would it course a "pull" in one direction or another? Would it assist in leaning the bike? Resist leaning?
Date: 27 October 2003
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Answers (Ordered by Date)


Answer: Nitro MacMad - 27/10/2003 22:37:39
 Dear Doug,

The speed of axial change in normal (adhesive) cornering results in insignificant (though not to say nonexistent) precessional effect. Non adhesive cornering (losing it) can however result in spectacular and for the driver /pilot/ rider terrifyingly incomprehensibly complex "gyrations".

This is because a gyro that cannot move freely "appears" not to precess (as its precession is passed fairly unnoticed to the Earth/ waterstream/ airflow) just as a gyro that is free (to precess) "appears" not to have all the mass it possesses.

My CX500 was more of a struggle than my Ariel Arrow (I seem to be showing my age) though I suspect this was because the CX flexed more rather than the 90 degree displaced crank.

NM

P.S. No comments please from the "treasured" (We need his James Randi scepticism) Dr Fisher about "displaced cranks".

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