solar hot gas-air balloons
Posted: Sat Mar 27, 2010 6:47 am
Of those considering a rockoon approach has anyone considered solar heating the lifting gas in the balloon. a clear drop cloth envelope can be sollarized with tempra powder ( not dust free ) or powerd charcoal. could at least decease the gas volume needed solar hot air balloons can reach 70000 feet without any lifting gas except air. the romanians are attemping to use a solar hot air balloon in there run for the google x prize. seems a low cost boost.