Crashed Copter Sparks Concern About Secrets

The U.S. military has tried in the past to build a stealth helicopter, but has kept secret if it has indeed succeeded. The wreckage in Abbottabad appeared to have exotic coatings and distinct surfaces and edges reminiscent of stealth aircraft such as the B-2 bomber and the F-22 fighter, aviation experts say. Equally important, they pointed to an unusual dishpan-shaped cover over the tail rotor, perhaps designed to make the aircraft quieter. ... remnants of the aircraft suggested extensive use of nonmetallic composite parts, which reflect less radar energy. Likewise, he said the tail's remains suggested that it was designed to shroud or mask metal parts, which are much more visible to radar. ...