The force screw theory is described best by quoting the thread Now going back to the topic of resultant pressure forces being described as a force screw. While this is useful in telling us overall stability, it does not give us information on the forces at the locations that really matter, which is directly at the contact patches of the tires. The value of the CoP is the result of a moment calculated from the CoG origin point, which will tell us the distance and force acting upon the CoG due to the summation of all aerodynamic devices. The original CoP theory is shown in the picture below, the Instantaneous CoP would be measured using the Forces and Moments result control in Simscale with the origin point at the CoG position. To my understanding, the Aerodynamic forces are acting along a “line of action” (LoA), which is similar to a roll center, and is constantly changing based on the dynamic motion of the car. This "dual vector" quantity acts along a "line of action", and NOT at any specific point, or "centre".” The resultant of the pressure forces is best described with a "force screw" (aka a "wrench"). “The distributed air pressure forces of aerodynamics DO NOT have a "centre of pressure". This is best said through quotes from the thread. With this information, we can calculate the distance of the CoP to the CoG, which results in an understanding of the expected stability of the car.Īccording to the link and discussion above, this description of the CoP is an incomplete picture of the actual forces acting on the car. The common theory is that this point can give us an accurate description of the forces acting on the car when based from a certain origin point, usually the Center of Gravity (CoG). The Center of Pressure (CoP) is used to help define the sum of all aerodynamic forces and moments about a singular point for a given system (in our case the entire race car). Starting on Pg 2 with the main description on Pg 4 I have done some research however I have not found any conclusive results or articles that accurately describe the condition.The original thread that sparked this investigation is given here: I have a special topic that I wish to fully understand with your help. The CoP Does not exist: Validating Aerodynamic forces through a "line of action" - CFD Online Discussion Forums
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