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Difference between revisions of "Counter steering"
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===Unconscious behavior=== | ===Unconscious behavior=== | ||
Countersteering is indispensable for bike steering. Most people are not consciously aware that they employ countersteering when riding their bike any more than they are aware of the physics of walking. They have learned to subsconciously apply the required countersteering. | Countersteering is indispensable for bike steering. Most people are not consciously aware that they employ countersteering when riding their bike any more than they are aware of the physics of walking. They have learned to subsconciously apply the required countersteering. | ||
===Gyroscopic effects=== | ===Gyroscopic effects=== | ||
One effect of turning the front wheel is a roll | One effect of turning the front wheel is a roll moment caused by gyroscopic precession. The magnitude of this moment is proportional to the moment of inertia of the front wheel, its spin rate (forward motion), the rate that the rider turns the front wheel by applying a torque to the handlebars, and the cosine of the angle between the steering axis and the vertical.<ref name="Cossalter"/> | ||
For a sample motorcycle moving at 22 m/s (50 mph) that has a front wheel with a moment of inertia of 0.6 kgm<sup>2</sup>, turning the front wheel one degree in half a second generates a roll moment of 3.5 Nm. In comparison, the lateral force on the front tire as it tracks out from under the motorcycle reaches a maximum of 50 N. This, acting on the 0.6 m (2 ft) height of the center of mass, generates a roll moment of 30 Nm.<ref name="Cossalter"/> | For a sample motorcycle moving at 22 m/s (50 mph) that has a front wheel with a moment of inertia of 0.6 kgm<sup>2</sup>, turning the front wheel one degree in half a second generates a roll moment of 3.5 Nm. In comparison, the lateral force on the front tire as it tracks out from under the motorcycle reaches a maximum of 50 N. This, acting on the 0.6 m (2 ft) height of the center of mass, generates a roll moment of 30 Nm.<ref name="Cossalter"/> | ||
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| accessdate = 2009-12-31}}</ref> and is summed up in a simplified way as "Push the right-hand bar to steer right; push the left-hand bar to steer left". | | accessdate = 2009-12-31}}</ref> and is summed up in a simplified way as "Push the right-hand bar to steer right; push the left-hand bar to steer left". | ||
==The Wright Brothers== | ==The Wright Brothers== | ||
Wilbur Wright explains countersteering this way: | |||
{{Quote| | {{Quote| | ||
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==External links== | ==External links== | ||
*[http://www.tonyfoale.com/Articles/Balance/BALANCE.htm Balance and Steering], by | *[http://www.tonyfoale.com/Articles/Balance/BALANCE.htm Balance and Steering], by Tony Foale | ||
*[http://www.superbikeschool.com/machinery/no-bs-machine.php "No B.S. Machine"] physical experimentation | *[http://www.superbikeschool.com/machinery/no-bs-machine.php "No B.S. Machine"] physical experimentation | ||
[[Category:Motorcycle riding techniques]] | [[Category:Motorcycle riding techniques]] | ||
[[Category:Motorcycle | [[Category:Motorcycle physics]] | ||
[[Category:Motorcycles]] | |||
[[Category:Mopeds]] | [[Category:Mopeds]] | ||