Is C.G. of wing itself in line with hang point (hang glider)?
The centre of gravity must imperatively be located between the nose and the quarter of the mean aerodynamic chord. The quarter of the mean aerodynamic chord is the point where applies the resultant of the forces and moments aerodynamic. One finds of it the definition theoretical low.
If the centre of gravity is placed behind the quarter of the average aerodynamic cord, the wing is unstable and completely impilotable... If the centre of gravity is too ahead, it is hardly less serious, the wing &quot; marsouine &quot; by carrying out oscillations around the axis of the pitching, oscillations which can, at worst if the control surfaces are not sufisament dimensioned to be able to increase the moment to pull up, not diminishing and leading to the crash..
Check out http://aeropic.free.fr/pages/modelisme/theorie/theorieenglish.htm#:~:text=The%20centre%20of%20gravity%20must,of%20the%20mean%20aerodynamic%20chord.