[amsat-bb] Payloads required for very big balloon flight

HI WB9SBD plans to fly a very large balloon. He wants to reach hopefully 250,000 ft. and make the balloon a floater i.e. for it not to burst. I thought this might be an opportunity for AMSAT. To fly a transponder or other payload. More Details here http://www.qsl.net/wb9sbd/300K.html

Steve G6UIM