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Old 10-27-2013, 10:35 AM   #68
lnewqban
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Joined: Jan 2012
Location: Florida
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Quote:
Originally Posted by beendog View Post
.........Thanks very much lnewqban I understand this to my satisfaction now!.......
You are welcome, Beendog

The throttle keeping while cornering is not as far from coasting as many believe.

According to Keith Code in his second book, all it takes is little more acceleration than coasting for the rider to be "fair" to each contact patch.

"Considering that most machines in a static or constant speed situation have a 50/50 weight distribution (+ or - 5.0 percent) front-to-rear, we begin to calculate the guidelines of correct acceleration through a turn.
By the numbers, we want to transfer 10 to 20 percent of the weight rearwards, using the throttle. Technically, this is 0.1 to 0.2 G of acceleration. Simply put, it's the force generated by a smooth fifth-gear roll-on in the 4000 to 6000 rpm range on pretty much anything over 600cc.
That's not much acceleration -but it does the job."


That 0.1 to 0.2 G means a gain of speed of 2.2 to 3.3 mph per each second spent on the turn.
In terms of longitudinal traction of the rear patch that is 10% to 20% of the total weight (bike+rider) pushing rearward on the pavement (48 to 96 lbs in our previous example).

Consequently, your leaving speed will be dictated by the maximum traction and lean angle for those conditions and turn, while your entry speed and initial lean angle will be lower (more for a longer turn).

Coasting is advised by Keith as an OK approach, although not for the totality of the turn:

"When you get to the throttle determines where the bike is actually working. The earlier into a corner you get onto the gas the sooner you have the suspension in-range, weight transferred and so on. The later into a corner you get onto the gas, the more likely you are to be gas ''greedy"
for the exit."


Note that he refers to coasting as zero acceleration rather than deceleration (some minimum gas is supplied).
Wrongly, many riders extend the deceleration (by trail-braking or fully closed throttle) all the way to the apex of the turn, while over-taxing the front patch.
As I see it, they turn slower than they could, simply because, if describing a constant radius turn, apex means nothing and if they didn't slide at the entrance, they wouldn't from there to the apex.
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