Originally Posted by lincoln
O2 has a simpler wing, no sheeting except in center. Easier to build. Very nice handling for beginners, nice and slow. Save the 3014 for when you want to go fast.
If you have built one "flat bottom" wing before, I would recommend the IIs. It has a semi-semetrical leading edge, but still not difficult.
This air foil will give you better wind penetration.
The IIs is very easy to fly.