Solar Impulse Airplane Makes Public Debut In Paris
dsmendes writes "The Solar Impulse airplane made its debut at the Paris Air Show with a 20 minute public voyage powered by nothing but solar cells, with 12,000 cells on the wings powering 4 10-horsepower motors."
This is what this plane is doing. It charges its batteries during the day, while flying, and discharges them during the night. It has already flown during a complete day-night cycle.