A319
Ref Chord length 4.193m (14.71m aft of a/c nose)
CofG Limits vary according to Weight and Phase of flight in a non linear fashion.
Rough figures below
T/o& Ldg @ Min Weight 14%-39%
In flight @ Min Weight 12%-40%
T/o&Ldg @ MTOW 21%-38%
in Flight @ MTOW 19%-39%
for info on rotating bogies (A330 / B767 / B747) try
http://www.aerospaceweb.org/question/design/q0200.shtml
Regards
BB