Tuesday, December 29, 2009

NASA crashes helicopter to test new shield for cars

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Washington: NASA has intentionally crashed a 3,000-pound MD-500 helicopter loaded with dummies to test a new safety shield, which might someday be used to make the cars we drive safer.

According to a report in Discovery News, the small helicopter, contributed by the US Army for NASA's research program, survived a 35-foot plunge to the ground intact, thanks to a lightweight honeycomb structure that bore the brunt of the impact.
The honeycomb shield, made of Kevlar 129 - the same material used to build bulletproof vests - was attached to the underneath of a 3,000-pound MD-500 helicopter at NASA's Langley Research Center in Hampton, Virginia.

The shields can be made of any material, as it is the structure of the honeycomb that affords the strength and flexibility to cushion the impact.
"The beauty of the honeycomb is that it will permit you to customize," said project engineer Sotiris Kellas.

"We like composites because we have more alternatives for tailoring, but they can be made out of any material you want," he added.

For the test, which took place former this month, the craft was suspended in the air with cables. Restraints were released, permitting the helicopter to fall, and just before it hit the ground, explosive devices fired to break the cable.
Four crash dummies, including one with simulated internal organs, were seated inside. The impact was equal to what might be considered a relatively severe crash at about 33 miles per hour.

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