Be sure to balance test the boat and add molten lead shot for balance. Keep in mind that this means not only left to right but also fore and aft balance.
The BES is used mostly for RC airplanes. What it does is monitor the power coming from the batteries. It will stop supplying power to the motor when the battery power drops too low, but it will allow power to the control servos and receiver. If you do not have an ESC with BES, you would need a second battery pack just for the receiver and to power the servos.
To help with flight, tilt the prop down 1° to put the plane into the right attitude for flight. Also, turn the engine slightly to starboard to counter act the port-forcing effect produced by the spinning prop.
For very light planes, I would use a Clark Y, NACA 2411, or NACA 0012 airfoil [Airfoil Info]. Once you have the airfoil profile you like, make a cut-out of the profile in sheet metal to be used as a cutting guide. Don't forget to incorporate someway to mount the wing to the fuselage. Usually on starter planes, the wing is mounted with rubberbands so that a crash will not damage the whole plane. If your ailerons are only 1/4 the wing span, then the aileron cord should be 1/4 the wing cord. If your ailerons are nearly 1/2 the wingspan (ie; nearly the full length of the wing), then the aileron cord should be 1/8 the wing cord.
