What is reflex, and how much do I need?
Reflex is the position of the ailerons relative to the wing surface when they are in a neutral position. Reflexing the ailerons downward increases the camber of the wing, increasing lift, but also drag. Reflexing the ailerons upward a tiny amount will reduce lift a bit but also reduce drag, so the plane will glide faster to make up the lost oft. With an aileron servo on each wing and a programmable TX you can change the camber in flight to suit the conditions, but this complicates everything and defeats the low cost and simplicity of our two channel slope soarers. You should set your ailerons flush with the wing on all models.