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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Mar 2009
Posts: 3,830 Likes: 69
Talk Morgan Addict
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Talk Morgan Addict
Joined: Mar 2009
Posts: 3,830 Likes: 69 |
Something else less well understood complicates this issue.
Gyroscopic Precession generates a force on spinning objects.
A sudden force on the axis of spin in our case will firstly cause the wheels to suddenly react by their tending to move in towards each other at the leading edge (toe-in). As the axle assembly moves the other way and against the lower rebound spring the opposite forces generate the opposite force so that the wheels then try to toe-out.
Any slight free play in the tie rod bushing will result in sudden ocillation between toe-in and toe-out.
For a motorcyclist the effect is noticed when pushing the handlebar (left or right): the bike lays over to the same side and NOT the other side as you might expect . Very interesting. I've never considered that at all. Thanks for raising it.
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Joined: Dec 2011
Posts: 1,943
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Dec 2011
Posts: 1,943 |
Something else less well understood complicates this issue.
Gyroscopic Precession generates a force on spinning objects.
A sudden force on the axis of spin in our case will firstly cause the wheels to suddenly react by their tending to move in towards each other at the leading edge (toe-in). As the axle assembly moves the other way and against the lower rebound spring the opposite forces generate the opposite force so that the wheels then try to toe-out.
Any slight free play in the tie rod bushing will result in sudden ocillation between toe-in and toe-out.
For a motorcyclist the effect is noticed when pushing the handlebar (left or right): the bike lays over to the same side and NOT the other side as you might expect . Very interesting. I've never considered that at all. Thanks for raising it. Like I said: "It is complex". Also thank you for your explanation.
Button
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Joined: Dec 2011
Posts: 381
Learner Plates Off!
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Learner Plates Off!
Joined: Dec 2011
Posts: 381 |
There is only a reaction if you try to change the angle of the rotation axle of the wheel. In a vertical translation of the stub axle on the kingpin there is no reaction... without play... theoreticaly.
The reaction is perpendicular to the movement (torque) applied.
Regards
2005 PLUS 4
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