"Small" hot air Blimp. Payload in the 3 or 4 people region. http://www.personalblimp.com/index.html They report (with a photo which may well be genuine but could be faked) that they are up to the 1st tethered flight stage - 6" apogee with 3 people. Flight tests 'any time now'. Looks feasible. Specs sound order-of-magnitude right. Russell McMahon Ref: Al Lewis. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist