A Brief Look at
Delayed Apex Cornering
There’s been some discussion among some of the members, lately, concerning a relatively new cornering technique called Delayed Apex Cornering. It differs enough from traditional teaching to give it the once over here.
First, some generalities: both methods apply when riding alone or, at least,
single file within a group. Neither method is to be used to increase speed
through a curve but rather enhance the safety of the rider. Figure 1 below
shows a 90° curve to the right showing both lanes of travel. Figure 2 shows the
same except it shows only one lane. The line to the left should be considered
the dotted line. Disregard the red line in the illustration.
As shown in Figure 1, the traditional approach method has the rider starting on the outside of the curve, well clear of oncoming traffic, moving closer to the inside at the apex and finishing on the outside, again well clear of the center dotted line. Power roll on occurs at or immediately after the apex.
This has the effect of
flattening out the curve, minimizing lean and possible loss of traction.
Throughout execution, the rider should have his head turned in the direction of
the point of exit.
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Figure 1. MSF BRC Illustration
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The Delayed Apex method has the rider using a straighter approach from the outside, a more aggressive lean, an earlier power roll on and finishing again on the outside, possibly somewhat further down range.
The advantages here are improved visibility throughout the
maneuver, increased speed in the turn, improved confidence in one’s ability and
greater use of the bikes handling potential. See Figure 2.
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Figure 2. Delayed
Apex Curve Approach – James Davis |
According to a fellow chapter member, “I’ve used both methods, and have convinced myself
that I see vehicles … using the delayed technique that I simply can’t see using
the smooth curve technique. It’s become much easier to re-adjust for curves
that are tighter than I expected, and I’ve cut down tremendously on both ending
up swinging out to wide on right hand curves, and cutting across the centerline
on blind left hand curves. It’s allowed me to not be as tense on my bike in the
mountains which further results in a smoother, safer ride.”
Personally, I have a couple of concerns about this new method.
- First, using an aggressive lean demands
ideal road surface conditions right at the point you need all the traction you
can get. Find a little gravel or a slick spot there and the Laws of Physics will
take over control of your bike. Additionally, as Fig.2 shows, the spot within
the lane you’re going to use to execute this aggressive lean is closer to the
less traveled part of the lane, away from the tire tracks, where gravel and
other trash is usually located.
- Second, the ability to successfully navigate a curve at a higher speed will undoubtedly lead to riders running faster through the twisties, human nature being what it is. Reaction time being constant, you’ll find yourself closer to the obstacle or condition than otherwise, requiring harder braking. However, the improved line of site may negate this effect. Thirdly, and probably most importantly, this method has not, to my knowledge, been endorsed by the Motorcycle Safety Foundation. They are the experts in all things related to our riding safety. I look to the experts to test my cars, electronics, services, etc. They know more than I know. I’ll certainly look to them for this.
Disclaimer: The views
presented here are my own and do not represent the views of GWRRA nor the Rider
Education Program.
Submitted by Tom Scully
NC-E Rider Educator