While plans for electric powered passenger planes are still way in the future, sport airplanes and small helicopters powered by batteries could be on the market in the next few years.

尽管电动客机还属于遥远的未来，但电池驱动的运动飞机和小型直升飞机再过几年就可以推向市场。

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The robotic samara spins about 15 times per second and can navigate through small areas and avoid obstacles, giving it advantages over larger vehicles such as helicopters and airplanes.

机器翅果旋转大概每秒15次，并可以导航通过小的地方并且避障，比大的机器如直升机或者飞机更加突出其优点。

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Super capacitors, however, store much more energy than their traditional counterparts and are used to power small devices such as toys including model planes and helicopters.

但是，比起传统电容，超电容器能够储存更多的能量，并且可以为小的设备如模型飞机和玩具直升飞机等玩具提供电能。

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Below 1, 100 feet, well-defined corridors exist for small planes and helicopters to fly without needing permission from air-traffic control.

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At another local hospital, Memorial Medical Center, a small fleet of helicopters was brought in to evacuate patients and staff after hospital officials were told "by officials on the ground to take the matter into our own hands, " said Trevor Fetter, president of Tenet HealthCare Corp.

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The number of helicopters in Asia represents only a small percent of the number of helicopters in the United States, while Asia has a significantly larger population and is expected to be a major market for helicopters over the next two decades.

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