The C.P. Position of Aerofoils: A Simple Graphical Method for the Use of the Practical Designer

IT is wished to propose a simple graphical method for finding the approximate C.P. position of an aerofoil directly from the CL (CM) curve in cases where the C.P. positions are not indicated—as, for instance, in the American and British aerofoil data reports. This method eliminates the necessity of calculating for each CL the a by the well known relation