Here is a short clip from the 2 hour DVD documentary "PSS Masters" from Radio Carbon Art. PSS stands for Power Slope Scale and describes gliders modeled after full scale powered aircraft either prop or jet powered. PSS Masters features the sport top pilots and skilled builders attending the world's largest PSS event in Los Angeles, California. To BUY this DVD, visit http://radiocarbonart.com/Pages/pssmain.html Since 1997 Radio Carbon Art has been producing high quality films for the R/C airplane community.