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SHRINKING SPIES

机译：缩小物种

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摘要

Big, unmanned spy planes, like the Predators flying over Iraq, have plenty of problems. For starters, they are expensive to build and operate. More important, some can be relatively easy to spot. Shrinking such planes so that they weigh less than two ounces would result in the perfect vehicle to get a bird's-eye view of the terrain. Of course, flying a craft as small as 41/2 inches wide comes with its own difficulties-the smaller the flyer, the more unstable and less energy efficient it becomes. To smooth the flight of such small planes, Peter Ifju, a professor of mechanical and aerospace engineering at the University of Florida, created a flexible wing (built onto the prototype plane at right) that can keep a steady course in the face of gusty winds. Inspired by the wings of bats, Ifju built a carbon fiber skeleton covered with a latex membrane that pacifies gusts by acting as a shock absorber.
机译：大型无人侦察机（例如掠夺者飞越伊拉克）有很多问题。对于初学者来说，它们的构建和操作成本很高。更重要的是，有些相对容易发现。缩小此类飞机使其重量不到两盎司，将使它成为理想的车辆，可以鸟瞰整个地形。当然，飞行小到41/2英寸宽的飞行器会有其自身的困难-传单越小，它变得越不稳定且能源效率就越低。为了使这种小型飞机的飞行平稳，佛罗里达大学机械和航空工程学教授彼得·伊夫（Peter Ifju）创造了一种柔性机翼（建在右侧原型机上），可以在阵风时保持稳定的航向。受蝙蝠翅膀的启发，Ifju构建了一个碳纤维骨架，上面覆盖着一层乳胶膜，可以充当减震器来缓解阵风。

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