C of G is pretty well along the line of the front sheeting, install your hardware put a finger on each wing tip at the edge of the sheeting and balance from there. (rough rule of thumb)
Flying... it's a stick!!
As long as you have a good engine, it's well balanced and you know how to fly it's a GREAT PLANE!! Place your brain in neutral and have some fun!!
This is assuming that the plane has not had any nasty accidents prior to you buying it of course...
As with any new plane (or slightly used) a close inspection is required, correct any minor problems check the control surfaces and linkages etc. Also look at the assembly of the AC - some of the earlier Vmars were not put together perfectly. A little extra glue might make a world of differance!
[X(]
I currently own both a 40 and 60 Vmar stik and I love them both - but... when I first got them they did need some attention. Since then they have been nothing but fun!
Happy Landings!