a088008,

Low Reynold's number kind of implies low speed and/or small chord. Generally, model aircraft have both. What I was getting at is that models generally fly at low Reynold's number, and when they are flying at their slowest speeds, the Reynold's number can be problematically low. Gliders have high aspect ratio wings so they can have the benefit of lower induced drag, and in spite of the possibility of operating at very low Reynold's numbers. Low Reynold's number is not really advantageous, in general, it is just something you have to live with when your plane is small and/or slow. The only potential benefit I can think of for low Reynold's number is the ability to maintain laminar flow further back on the wing, to reduce skin friction drag. I doubt that model aircraft take advantage of this very often.

banktoturn