What's My Line, Part II

What's My Line, Part II

     In part one; we looked at the “racing line” in the textbook design of a long straight followed by a 90 degree corner followed by another long straight. We looked at how the theoretical and geometric “lines” are similar. In part two, we’ll get into corner combinations and more.
     “Don’t use the brakes, they only slow you down!” While that statement is true, on a closed road course or on the street, it’s not realistic. The first phase of a corner is the actual braking zone. For beginners in road racing, new students are often encouraged to get all of their braking done in a straight line so that they can focus on the turn-in, apex and track-out points in a smooth and controlled manner. However, when you advance your driving technique, trail braking (or staying on the brakes as you turn in) gives the front end tires more “bite” or grip leading to better initial handling into the turn. Simultaneously, this forward weight transfer helps to lighten the rear of the car which then helps “rotate” the car into the corner thereby lessening steering input. So far so good. The balance of releasing the brake, coasting and re-applying the throttle while the wheels are still turned is all about good hand/eye coordination as well as the seat-of-the-pants feel.
     The theory of getting on the gas as soon as possible and going to full throttle as soon as possible is the same in any corner that leads onto a long straight. What you don’t want to do is get on the gas and then have to lift off and then re-apply. The time and momentum lost during that dance will be more than if you had just waited a bit longer to go full throttle or perhaps squeezed on the gas pedal a bit more smoothly (not an on/off switch) to sustain that acceleration.
     As we combine this with corner combinations, we need to look at which corners to “give up” in order to gain the maximum amount of speed for the rest of the lap. For example, if you have two 90 degree corners in succession (e.g. left then right) and the second corner is followed by a long straight, you’ll want to apex the first corner very late in order to take a better line through the second and be able to come off of that corner with maximum acceleration as soon as possible. The amount of time lost by not taking the textbook line through the first corner will be more than made up by the extra speed you’ll gain by coming off of the second corner better.
     How do you know which corners to prioritize for the best line? Start with the ones that lead onto the longest straights. Also, look at the highest speed corners as a tenth of a second gained at high speed is much more distance traveled than a tenth of a second at low speed.
In part three, we’ll look at more corner types and how rain affects the line.

 

By Larry Mason

Copyright © 2021 Larry Mason

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