The Eraole is a hybrid, solar and biofuel-powered light biplane aircraft with a zero-carbon footprint. It's name is a combination of of Eole, Greek god of the wind (Aeolus), and Ra, Egyptian god of the sun. The plane has be under development since 2009 by a team led by scientist and former yachtsman Raphael Dinelli. The Eraole is powered by an electric engine fed by large solar panels spread over its wings. At night, or at times when the aircraft can't draw enough energy from the sun, the Eraole switches to biofuel. Dinelli and his team have spent two years researching the best biofuel for the task, settling finally for an oil made from micro-algae, cultivated specifically for this purpose. Overall, the Eraole is expected to run on solar power for about 25% of the time it's airborne and biofuel for another 55%, with the remaining 20% gliding. Composite materials have been used extensively to lighten the weight. The aircraft is also equipped with small lithium-ion batteries that provide extra power during take-off.
A history making zero-carbon flight was anticipated for June 2016; however, that is still pending. If successful, a commercial two-seater version of the plane might go into production for the private recreational market.