The C.G. Calculator

This  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. The Average  MAC Balance Point Input is 25%.
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Enter Root Chord (A): 

MAC.JPG (7542 bytes)

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) =

B.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

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