RE: Need help with Wattage CAP 232
Don't worry about knowing "what the 16/15/4 means." Those numbers do not help you figure out if the motor is "good" for a particular airplane. They're just model numbers. In reality, they are just the physical dimensions of the rotor and the number of turns of wire on the rotor. Again, not useful in figuring out of the motor is right for your plane.
The recommended stock configuation for that plane will make it heavy for its size, and a little underpowered. I'll tell you what a local pilot used on his Wattage Giles 202 (similar size/weight/purpose plane): He used a 3S ThunderPower 2100 LiPoly pack, an AXi 2808/24 motor, and a 10x4.7 prop. The plane came out at around 20 ounces as I recall, not the 28-32 ounces advertised by Wattage, and has an excessive amount of power.