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Old 07-08-2013, 08:34 AM   #16
lnewqban
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Quote:
Originally Posted by Navy Chief View Post
Great photo sequence of exactly what happens during a highside... Glad the rider was okay.


This is what the rider stated after the fall:

"Interesting. I see where folks note I chopped the throttle. Yet the slide sideways continues for some distance and time beyond that point. Thoughts? Did the rear end get light with the momentary chop, which in turn caused the rear wheel to spin faster and more sideways instead of immediately hooking up? If I had not chopped, would it had hooked up sooner possibly saving the highside? Funny thing is I didn't think I had chopped the throttle really, in my mind when it was happening. But from the photos, apparently, I did. I know I was (in my mind) not panicking, but instead I was looking at my next apex point (the 9/10 complex at Chuckwalla is an "S" bend curve that leads from a left turn to a right turn, which is why my eyes are then looking to the right) for that split second trying to will myself to get straight and get there, but to no avail.

As a side note: The throttle chop was only one of several mistakes in that corner for me it seems. First was poor line selection that put me in an area of the track that full of fine dust. In the first few photos, you can see the trail of dust as my knee puck slides. Reason: I was experimenting with going deep into the corner for a different line through the 9/10 complex. Obviously not a good move. At least I can now attest to that. Second problem seems to me was that I didn't have my body mass far enough off the side of the bike, which increased lean angle of the bike itself in an already off-camber corner. If I had the bike just a little more upright at the same speed, maybe I could have had more contact patch on the track and avoided the slide to being with.

Oh well, at least I have some cool pics to teach my kid what "not" to do at Chuckwalla."

http://forums.superbikeschool.com/index.php?showtopic=2165

The problem is not that the rear tire skids sideways (while the rear of the bike gets lower), the bike can continue rolling on the front tire in a controlled manner (flat track racing, motorcycle dragging).
The problem appears when that rear tire suddenly regains grip and stops slipping (rolling or locked) to start rolling without slipping.

If that contact patch of the rear tire is significantly out of alignment with the contact patch of the front tire at the moment it regains grip, a violent re-alignment of those and kick-up of the seat happens.

Racers are trained to stand up from the saddle, so that violent snap up doesn't kick them on the butt and catapult them to a high side.

Note that for that for that sudden regain of grip or snap happens, 1) the contact patch of the rear tire needs to be unloaded (from torque or brake) and 2) it needs to be skidding over a surface that can provide good grip.
In the case of the OP, the first thing happened (rider rolled-off throttle reducing torque to the tire), but not the second (surface was still slippery).

MSF courses teach to keep the initial load on the tire constant during a rear skid as long as the rear tire is way out of alignment.
That initial load can be excessive rear brake (keep it locked-up) or excessive torque (keep or slowly reduce throttle).
If you let go either one while both tires are aligned, no highside fall will follow.
If you, like the rider in the OP's video did,
let go either one while both tires are way out of alignment but on a slippery surface or dirt, no highside fall will follow either.


lnewqban screwed with this post 07-08-2013 at 09:11 AM
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Old 07-08-2013, 09:03 AM   #17
JDK111
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Quote:
Originally Posted by DAKEZ View Post
He cut the throttle and used the clutch to help the rear wheel regain traction... And let the bike have the freedom to right ITSELF.
He eased off the throttle just enough to stop the low side from continuing (he didn't touch the clutch) and steered in the direction of the slide just enough to stop the high side from happening when the rear wheel gained enough traction for the bike to RIGHT ITSELF.
Dude knew what he was doing.
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Old 07-08-2013, 12:13 PM   #18
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Quote:
Originally Posted by JDK111 View Post
He eased off the throttle just enough to stop the low side from continuing (he didn't touch the clutch) and steered in the direction of the slide just enough to stop the high side from happening when the rear wheel gained enough traction for the bike to RIGHT ITSELF.
Dude knew what he was doing.
If he knew what he was doing, he wouldn't have put himself in that situation
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Old 07-08-2013, 01:46 PM   #19
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Originally Posted by sphyrnidus View Post
If he knew what he was doing, he wouldn't have put himself in that situation
Funny ... I must have missed the part of the vid where he crashed
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Old 07-08-2013, 02:25 PM   #20
markie*mark0
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Quote:
Originally Posted by DAKEZ View Post
weighting the pegs does NOT lower the center of gravity.




ok douch bag, maybe a bad explanation, but getting out of the seat and onto the pegs helps the bike work less and become more stable.
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Old 07-08-2013, 02:27 PM   #21
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Originally Posted by DAKEZ View Post
weighting the pegs does NOT lower the center of gravity.




oh and btw if you actually learnt proper english than your would know its centre
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Old 07-08-2013, 05:31 PM   #22
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Go fetch the beers and bring some bacon sammiches n00b. Chop Chop.
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Old 07-08-2013, 05:41 PM   #23
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Quote:
Originally Posted by markie*mark0 View Post
oh and btw if you actually learnt proper english than your would know its centre




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Old 07-09-2013, 08:07 AM   #24
markie*mark0
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haha you guys are funny
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Old 07-09-2013, 01:58 PM   #25
C/1/509
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Quote:
Originally Posted by markie*mark0 View Post
oh and btw if you actually learnt proper english than your would know its centre
Paging Klay...Klay to the front desk please...
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Old 07-09-2013, 07:29 PM   #26
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Quote:
Originally Posted by markie*mark0 View Post
oh and btw if you actually learnt proper english than your would know its centre
Oh, by the way, if you actually learned proper English, then you would know that it's spelled center, and also that "it's" is a contraction of "it is" and that "its" is the possessive form of the pronoun "it."
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Old 07-09-2013, 07:43 PM   #27
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Quote:
Originally Posted by JimVonBaden View Post
It started by braking and unweighting the rear tire. Watch closely and you will see the front squat.

As for the save, back on the gas lightly by reflex, and standing up to weight the rear again. It is a common theme on Mulholland Drive!

Jim
+1

I saved a high side my first year of riding by doing the exact same thing and it waz sheer luck, cu's it sure as shit waz'ent skill on my part.
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Old 07-09-2013, 07:54 PM   #28
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Whooot,FIGHT!!!!!

My money's on the guy on his mums computer.
Bet its the n00b.
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Old 07-11-2013, 01:01 PM   #29
markie*mark0
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more douch bags to the cause

http://lmgtfy.com/?q=how+to+spell+center+in+english

maybe its too many miles on the "brain cell" killing boring BMW's you guys are riding?
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Old 07-12-2013, 10:05 AM   #30
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Save it..???

Looks to me like he did it on purpose and was ready for it.
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