The MAC Calculator (RC-180.htm)

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This will calculate the position of the percentage of the Mean Aerodynamic Chord (%MAC) of a model airplane wing for a given position of the CG.
The Average Cg Center of Gravity Root Input is 25%.
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Enter Root Cord (A):

Enter Tip Cord (B):

Enter Sweep Distance (S):

Enter Half Span (Y):

Enter Center of Gravity (CG):

Sweep Distance @ MAC (C) =

Mean Aerodynamic Cord (MAC) =

MAC Distance from Root (d) =

% Mean Aerodynamic Cord (%MAC) =

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))

%MAC B.P.
= ((CG-C) / MAC)*100

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