Treehugger: SolarShip- A Solar-Powered, Helium-Filled Cargo Plane That Floats

The goal of zero emissions air travel generates a lot of great but fantastical ideas (huge cloud-shaped blimp, anyone?) -- but there's a company out there that has already flown test flights of a solar-powered helium plane. Toronto-based startup SolarShip has designed an hybrid airship and airplane that can not only fly 1,000 kilometers (621 miles) carrying 1,000 kilograms (2,205 pounds), but also does it solely on the power supplied by the sun.

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