Sikorsky just rolled out there newest development in the helicopter field,which is unlike any other helicopter in the world,the S-97 has 2 Counter-Rotating Main Blades and instead of the usual tail roter,has a pusher prop at the tail,but do not look for one near you soon,only 2 have been built and will start testing next year:
http://www.raider.sikorsky.com
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