Quote:
Originally Posted by Ken Fry
Good description.
Yes, most bikes are self-correcting. A gust causes the steering axis to translate away from the wind side. (The gyro effect of the rear wheel tends to restrain the bike's rolling more than it prevents the frame from yawing, because of the leverages involved. The frame yaws, and the steering head translates.) The contact patch, due to trail, is behind the extension of the steering axis. Therefore, in a crosswind from the left, the steering axis moves slightly to the right. The contact patch is then slightly to the left of the steering axis, meaning that the bike is steering itself to the right. This banks the bike to the left, into the crosswind.
You can take your hands off the bars entirely, and this feature works just fine (provided you don't have a bike prone to tank slappers)
If you really freeze your muscles and clamp onto the handlebars with a death grip, you can defeat this built-in trait. Taking the weight off the grips by tucking and putting your chest on the tank makes the effect more pronounced.
On some bikes, cranking in a lot of steering damper will interfere with this self- correction, and the bike will tend to wander.
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How does the bike know how much to counter steer?
How does the bike know how hard the wind is pushing it?
At what point does the bike stop countersteering?
Without rider steering input in a cross wind the bike will role in the direction of the wind force and follow a long arc trejectory in the direction of the wind force. Prosesion at the front wheel on its own is not enough to get the bike to roll into the wind. Rear wheel prosesion only influences to rate of roll of the bike in the diriction of the wind force.
Without rider steering input in a crosswind the bike will not find the angle of lean into the wind nessisary for the bike to follow a staight trejectory along the roadway.
Motorcycles are not self correcting