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US Navy's solar drone flies from and lands on water
Unlike most quadcopters, the Aqua-Quad doesn't take off from solid ground. Dr. Kevin Jones and his team from the Naval Postgraduate School developed it to fly straight up from the ocean or any body of water. And it can land back on water after it has fulfilled its mission, staying on or under the surface until it's deployed again. According to New Scientist, the Aqua-Quad (PDF) could be used to replace sonobuoys to search for submarines, especially enemy subs that might be lurking in the depths of the country's oceans.
