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Old 06-14-2019, 09:17 PM   #21
hudso2012
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Quote:
Originally Posted by Kenneth View Post
****Imagine you’re taking an infinite right turn. The turn grows infinitely wider. In taking this turn you maintain a constant lean angle. In order to do this you would have to increase your speed. Let’s assume you’re dragging your knee the entire time. As speed increases commensurate to the expanding radius, dose traction become more tenuous? ****
My intuition would be that, as the turn gets 'wider', you would need to increase speed to maintain the same angle. On an (ideal) flat surface, the contact patch of the tire with the ground remains the same (because the lean angle isn't changing) so the bike should be able to hold that angle at any speed. On a real road surface, of course, the traction of said contact patch will vary with the conditions, as it does in any other riding situation. Needless to say, I wouldn't attempt dragging a knee at redline in 6th gear regardless of how big the parking lot was!

Being a Physics minor, of course I checked Wiki to make sure I wasn't being silly. They have a whole page on the dynamic forces affecting, and created within, two-wheeled vehicles:
https://en.wikipedia.org/wiki/Bicycl...namics#Turning

I'd try to summarize, but I'd end up just copying and pasting the Wiki article, so I'll not do that. Maybe that helps answer your theoretical quandary?

Last edited by hudso2012; 06-14-2019 at 09:20 PM.
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Old 06-14-2019, 09:27 PM   #22
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Quote:
Originally Posted by Kenneth View Post
Exactly!!!

That’s the scenario. Is traction equal, given the same lean angle, at all speeds?

So I was considering that it takes time for suspension to travel, tires to deform around road surface, etcetera. And so a given lean angle may be radical but stable in a tight, low speed corner but much less stable when applied in a high speed corner. But considering that is only my own conjecture I threw it out in the forme because my tuono blew up and I’m super f*ck’n board!
Tires lose traction when leaned over when the rider is on the brakes or hard on the throttle. Using maintenance throttle a sportbike is going to drag hard parts before the tires lose traction.

Suspension doesn't come into play in a turn unless you're on the brakes, the throttle, or the surface is uneven.
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Old 06-14-2019, 10:03 PM   #23
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If you're dragging knee the entire time is your body fixed in one position? I can drag knee, but I'm not hanging off so far I can drag elbow like Marquez. Take the rider's body position out of the equation. If the path you're following is gradually decreasing in radius, then to maintain the same lean angle the bike would have to accelerate throughout that radius.
Decreasing or increasing?
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Old 06-15-2019, 04:55 PM   #24
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Decreasing or increasing?
Increasing. Using the OP's scenario where an infinite right turn gradually opens up (becomes a wider turn).
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Old 06-15-2019, 06:39 PM   #25
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Ok. You put decreasing in your reply so I wanted to be sure I understood.

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Old 06-17-2019, 08:21 AM   #26
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You can decrease the lean angle in a corner by shifting your body weight to the inside of the corner. This can effectively decrease the lean angle required at any speed. Knee dragging will not by itself affect weight transfer unless you want to pull a groin muscle during your next upd.
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Old 06-17-2019, 09:12 AM   #27
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Originally Posted by pbfoot View Post
You can decrease the lean angle in a corner by shifting your body weight to the inside of the corner. This can effectively decrease the lean angle required at any speed. Knee dragging will not by itself affect weight transfer unless you want to pull a groin muscle during your next upd.
Most folks have to slide their off the seat to drag knee, that's when the weight transfer happens.
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Old 06-17-2019, 09:35 AM   #28
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Most folks have to slide their off the seat to drag knee, that's when the weight transfer happens.
This.
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Old 07-21-2019, 10:35 PM   #29
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If one is taking an infinite right turn and maintaining constant lean angle , at what point does one stop trail braking ?? Or does one never let off the brakes ??
Boom mind blown
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