I think this was mentioned once before, but check out NASA's APEX project. They plan on releasing a glider from a ballon at 100,000 feet (thin atmospheric aerodynamics, possible mars flight/glide usage). It was a pain to find these web sites, but now I have them saved... http://www.kynd.com/~outrspce/5_00nasa.htm http://www.nasatech.com/Briefs//Feb99/DRC9874.html http://www.dfrc.nasa.gov/gallery/photo/Apex/index.html http://www.dfrc.nasa.gov/Projects/apex/apex.html RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]