o solar como eólico...

Japanese Solar Sail Headed for Venus and Beyond
An ambitious solar sail mission designed by Japan is poised for launch tomorrow could become the first successful mission powered solely by sunlight, but that's not all. The spacecraft is also aimed at Venus and beyond, and could pave the way for a future hybrid space engine. (...) "This will be the world's first solar powered sail craft employing both photon propulsion and thin film solar power generation during its interplanetary cruise," said a JAXA mission website. (...)
Ikaros (Interplanetary Kite-craft Accelerated by Radiation Of the Sun)is designed to unfurl its sail during its first stage by taking advantage of its spinning momentum, and then actively deploying the rest of the way during a second stage."The membrane is deployed, and kept flat, by its spinning motion; four masses are attached to the four tips of the membrane in order to facilitate deployment."