The Palos R/CFlying Club The C.G. Calculator The form shown below will calculate the position of the Center of Gravity (CG) of a model airplane wing as measured from the leading edge of the Root Chord. If you would like to know the percentage of the Mean Aerodynamic Chord (MAC) for a given position of the CG you should use the form on The Mean Aerodynamic Chord Page.   Enter Root Chord (A):  Enter Tip Chord (B):  Enter Sweep Distance (S): Enter Half Span (Y): Enter %MAC Balance Point: Sweep Distance @ MAC (C) = Mean Aerodynamic Chord (MAC) = MAC Distance from Root (d) = Balance Point @ Root Chord (CG) = The Equations C = (S(A+2B)) / (3(A+B)) MAC = A-(2(A-B)(0.5A+B) / (3(A+B))) d = (2Y(0.5A+B)) / (3(A+B)) CG = %MAC B.P.*(MAC) + C [ Home | Club Information | Contests & Events | Flying Field ] [ Photo Gallery | Flight Training | Instructors Corner ] [ Newsletter | Links ] If you have any questions about this site, please contact Al.  Copyright © 1997-2000 The Palos R/C Flying Club.  All Rights Reserved.