The YF-22 is as advanced in its structural materials as in its aerodynamic design. Four major classes of composites make up almost 24% of its structure, another 24% is titanium, and the remainder is conventional materials. The Lockheed fighter has two-dimensional thrust-vectoring, in which a heat resistant nozzle directs engine thrust up and down for improved maneuverability. The nozzles are interconnected with the flight controls, resulting in far greater roll rates and rates of turn.
