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The above sliderule provides a "quick and dirty" means of determining just how far a car is away from "hit" or "separation" given the location of the instant center in terms of distance forward from the rear axle centerline and height from the strip surface. To operate the sliderule, simply click and drag the center section left or right. The numbers on the center section represent the instant center distance forward from the rear axle centerline. The numbers on the bottom section represent the instant center height from the strip surface. Align the two numbers for your car and the triangle indicates whether you're in the "HIT" or "NO-HIT" region. (The "50," "100," and "150" are percent antisquat numbers.) If you don't think this could possibly work for all cars, you're absolutely correct! You'll find, however, that it's "reasonably" accurate for all "reasonable" cars. The starting point was an 18 inch high center of gravity for a 108 inch wheelbase. This provides a "nice" 1 to 6 slope for the 100% antisquat line. If your car has a CG height closer to 20 inches, the dividing line shifts over to about 120% antisquat on the sliderule. In other words, this sliderule will get you in the ballpark, but, if you want to find the pitcher's mound, you'll have to use the information on Page 45. |