I have no doubts that OS has had a liner peeling problem, but nobody at our field has knowingly lost a liner any time recently and the ease of use and good power make them very popular.

Most of my 4-strokes are YS's now and there are several others flying them at our field without any problems. Area knowledge could be a factor, also the fuel mix may be critical to success. Everyone here uses Coolpower 30% heli in their YS's which probably is not readily available in Europe.

Walt