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Sun bird

Sun bird

作者:费润驭  时间:2019-03-06 12:14:00  人气:

The largest solar-powered plane took its maiden flight in Hawaii last week. The pilotless Helios reached an altitude of 23,000 metres and is expected to set new altitude records of more than 30,000 metres later this summer. Designed by NASA and AeroVironment of California, Helios has a single 74-metre wing plastered with solar cells and 14 propellers. It should be able to stay aloft for months at a time and can be easily landed for repairs. That could make it the perfect “poor man’s satellite” for weather observations, studying the Earth’s surface and telecommunications,