47. The YF-22 Design Was Significantly Altered For the F-22
Full Engineering & Manufacturing Development (EMD) began on the F-22 Raptor in 1991. The United States military awarded development contracts to Lockheed/Boeing (airframe) and Pratt & Whitney (engines). The manufacturers introduced significant changes from the YF-22 prototype, including moving the vertical stabilizers & engine intakes rearward as well as decreasing the leading edge & moving the canopy closer. The shapes of the wings and stabilator were also altered to increase strength and stealth features.