Sikorsky S-97 helicopter shoots for speed with unusual design

First came the superfast X2 helicopter. Now Sikorsky Aircraft has put that experimental technology into a more mature package, the S-97 Raider. Sikorsky hopes that the sleek, speedy design of the S-97, unveiled Thursday, will win the favor of the US Army as a potential replacement for OH-58D Kiowa Warrior helicopter, an airframe whose history dates back to the Vietnam War era, and as an aerial platform for special operations units.

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