Interesting. I've heard suggestions both ways: speed up or slow down. How does speed affect bike's response to same crosswind? I assume lateral component of crosswind would hit bike exactly same way regardless of bike's speed?
So difference has to with bike's behavior at different speeds? The...
So crosswind makes bike lean away from vertical which causes it to turn away from straight path! Then it's like case of parked bike being lifted off kickstand and being flipped to other side.
So lateral force acting sideways on bike & rider is sine function of crosswind angle. Direct crosswind...
So wind would affect trail and self-centering effect of front wheel?
Racing rules dictated that front wheels could not be enclosed by fairings. Which would expose front wheel to wind gusts from side. Hmm... force acting on wheel may make it turn and cause change in direction. Although there's...
So I'm trying to develop model of what happens to motorcycle's path when it gets hit by crosswind.
initial velocity = 100mph
crosswind direction = 45 degrees towards bike
crosswind speed = 60mph
Now I was thinking to separate crosswind into longitudinal and lateral forces. Longitudinal...
Actually no. Pull out multimeter and measure actual voltages at various parts of motorcycle electrical system.
1. leaving RR, it's close to 15v
2. at battery at idle, it's most likely 14.5v @ idle and close to 15v @ 1/2-redline
3. at headlight socket, with good relay-harness, probably close to...
Yes, that was for banked tracks where it's possible to get even higher cornering-forces than on flat ground. So for those tracks, if you lean bike to same relative-angle to ground as on flat, you end up with even more than 2G of cornering, 3G is possible. It's the combined lateral and vertical...
The 2G of force is inline with effective CoG and contact patch regardless of where rider's spine is located. In this example, it's in between spine of rider and axis of bike.
Yes, that model works, but rider still experiences 2G of forces. Banking only cancels out lean-angle, but it doesn't cancels out cornering forces. While you may be able to take 1G corner without leaning, there is still 1G of gravity and 1G of cornering. Just happens that cornering-forces are...
A more familiar model to understand this is to imagine you're standing upright and someone slides sideways into your foot. Obviously they'd kick your feet out from under you and you'd fall over them.
But... what if you saw them coming? You can lean away from them at certain angle and not fall...
Ideally you want guy-wires to be 90-degrees to posts. That would make for some long runs in this case. If the posts were 45-degrees outwards, then wires would be 45-degrees in other direction.
One calculation you need to do is measure load based upon average wind-speeds. Can probably find that...
Need to triangulate stand so it doesn't parallelogram and collapse laterally. Also triangulate at least one side of feet so it doesn't collapse fore & aft. Probably triangle on back side so less of tripping hazard. Sure there's some triangulation in lugs holding tubing together, but it's very...
Yes, extra centripetal force is pushing inwards on contact-patch and bike wants to flip over that patch to outside. It's an extra force in addition to gravity.
This is also static model, snapshot in time. Inertia wants to stand bike up and have bike go in straight line tangent to curve. Extra...
Don't forget that there's actually two forces on cornering bike. Downwards gravity and lateral centripetal force.
This is similar to if you hung an apple from rear-view mirror of car via string. String would have 1G when car goes in straight line. Under 1G of cornering, string would experience...
Note that friction is not what generates traction forces on tyres. This was resolved decades ago when friction-model would only allow dragsters to reach 200mph maximum. We now know that's not true.
For example, F=Nu is higher for rubber+steel than it is for rubber+asphalt. Yet going around...