I have a question concerning the use of winglets in models. I am aware of there use in full scale aircraft but was wondering if they as useful to same extent in models like make a 48 inch wing fly and glide like a 55 inch wing. I am considering modifying a combat armadillo wing with winglets to see what results I get and was wondering if anyone has tried this before. It is currently on a homeade SPAD aircraft that flies rather quickly and laterally is very touchy. The plane is set up well and trimmed will fly hands off. Will winglets slow down roll rates? The plane lands beautifully with no bad stall characteristics that I have found. I was wondering what shapes might be the best to try. Thanks in advance