




































Center
of Gravity Calculator 


















How
to use the calculator
 Input
your root chord.
 Input
your tip chord
 Input
the sweep distance (see the picture below)
 Input
the wing half span (1/2 the wingspan)
 Input
the desired balance point percentage. (for normal planes it should
be between 3033%, flying wings will be 2025%) This should get
you in the ballpark. Other factors that will effect CG position
are tail area, tail moment and airfoils. Always set your plane
up a little nose heavy for first flights!!!
The calculator will give you the CG at the
wing root! Plus a
few other numbers you might be interested
in. 








The
Center of Gravity Calculator

This
will give the wings Center of Gravity (CG) as measured
from the leading edge of the Root Cord. If you want to find out
the percentage of the Mean Aerodynamic Cord (MAC) for a given
position of the CG you should use the form on
The Equations
For S<>0 Forward
or Rearward Swept

For S=0 Straight
Leading Edge

C 
= (S(A+2B))
/ (3(A+B)) 
C 
= Zero 
MAC 
= A(AC/S)+(BC/S) 
MAC 
= A(2(AB)(0.5A+B)
/ (3(A+B))) 
d 
= YC
/ S 
d 
= (2Y(0.5A+B))
/ (3(A+B)) 
For all
Values of S 
CG 
= %MAC B.P.*(MAC)
+ C 

