# Recent content by DannoXYZ

1. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
2. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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.
3. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
4. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
5. ### Misc. Is My Steel Square Tubing Strong Enough?

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...
6. ### Construction Making a gong stand - will aluminium tubing be strong enough?

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...
7. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
8. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
9. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

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...
10. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

New Olympic sport: Synchronized Leg Dangling!!!
11. ### B Can someone please explain this paragraph from A Brief History Of Time

Rate of expansion has been revised with Hubble's Constant now being much smaller than what Hubble himself calculated. But is Hubble's Law still valid? That looking back in time at most distant objects show they are expanding at faster rate than closer ones? That would still support idea that...
12. ### B Elementary question on car crashes and momentum

Draw it as vectors and it becomes clear....
13. ### I Can a cornering motorcycle go faster if the rider puts a knee down?

hahahahahhahhhh!!! :-p I like this one: Rossi, the eternal jokester, is trying to see how outrageous he can make his copycats dance!
14. ### A How does 1-wheeled motorcycle turn?

Here's related behavior with sidecars. Traditional sidecars that keep tyres vertical requires the motorcycle's front wheel to turn like a car's and generate lots of cornering forces. Result is sidecars must go a lot slower than same motorcycle by itself around curves. However, uncoupling...
15. ### A How does 1-wheeled motorcycle turn?

Yup, I think it's the butt and hips causing changes in lateral tilt. Like riding bicycle no-hands. Tilting bike causes front-tyre to countersteer and causes bike to lean over. Seems this guy is able to teeter-totter left/right to cause tyre to lean. Throttle only affects longitudinal movement...