One thing that you will note when you read back through the threads here and under Aerodynamics is that some of the more sophisticated airfoils require considerable accuracy when building to make them work right or to full potential.

The smaller the aircraft, the more difficult it becomes to meet the building and aerodynamic requirements of the SD and similar airfoils.

So, the answer is, go find a simple and fairly thick (I think that 9 to 10% has been suggested elsewhere, flat bottom airfoil and start with that.

Good luck. And if it don't work just remember that it might make a good freeflight chuckie if the radio is no good