Thanks' for the information, although limited in content. I need to no the pitfalls before I committ myself. When I got into building and than flying model helicopters my goal was to become a profficient FAI pilot and this I believe I have obtained after many years of practise and patience. Knowing that I am capable pilot I want to transfere this knowledge into flying a scale subject. What I don't want is failure due to inherent problems associated with scale airframes. This is were I am seeking advise from those who have gone this route.