The Grumman/Sukhoi Su-43 Berkut looks like a strange apparition, but it's the successor of Grumman's X plane the X-29. With forward swept wings and two enormous Pratt & Whitney F100 engines the Su-43 is a suprisingly agile and incredably fast aircraft. The Su-43's radical wing design would never fly so well if not for the help of five on board flight computers assisting the pilot.