The Foundation Depth Calculator includes the vast majority of trees found in the UK, however it does not include every single tree. Total run (when working out the angle) = no of risers x going. This would not really be a consideration for a stock car, but could come into play for a kart or other vehicle with a shorter wheelbase.Ft. (Based on more rules for right triangles.) For example: If your wheelbase is 104", you would not want to raise the rear of the car any higher than 73.5". This approximates to 70.7% of your wheelbase. You don't want to raise the car any more than 45º. Is it possible to raise the car too much? The minimum of 10" creates just enough weight change to get a relatively accurate result. Ideally, you would want the raise the car at least 20", however, this can be very difficult to do. The more change in the weights that you can create, the more accurate the measurement will be. The higher you can raise the rear of the car (higher angle), the greater the weight shift will be, thus creating a greater change in front wheel weights.
The Center of Gravity Height calculation is based on the change in the front wheel weights in relation to the angle at which the car is raised. Why do I have to raise the car a minimum of 10"?
Where these 3 coordinates intersect in space is the actual center of gravity. You need to know the CG along the wheelbase, the CG for the track width of the car, and the CGH. The true center of gravity is actually a 3 dimensional point in space. We are not just looking for the center of gravity (CG), but the center of gravity height (CGH). Why do I have to raise the car and re-weigh it to find Center of Gravity? Add this number to the CGH to find the center of gravity height in relation to the ground. C is the average circumference found by adding the LF and RF sizes and dividing by 2.įor example: Your LF is 85.5" and your RF is 87".You can measure your axle height or calculate it using the average of your two front tire sizes and the formula for the circumference of a circle. To find the CGH from the ground, you must add your axle height to the above calculation. This calculates the Center of Gravity Height from the axle height. FWc is the change in front wheel weights.Ok, now that we know the tangent of the angle we can calculate the center of gravity height based on our weight measurements using the following formula: Once we know the value of the adjacent side of our triangle we solve for the tangent of q using: So, in our exercise, when we raise the car 10" we are creating a right triangle with the following properties: The following diagrams are greatly exaggerated for illustration purposes. Specifically, we are using the Law of Tangents, and the Pythagorean Theorem. The center of gravity height is found using the rules of trigonometry and right triangles.