FLYING QUALITIES OF PILOTED AIRCRAFT - CAFE Foundation

MIL–STD–1797AAPPENDIX AFIGURE 195. Comparison of p max /F as for several conventional Class IV aircraftwith CAS curves of figure 194.c. Roll CAS GradientsEvolution of the F–16 CAS shaping network is a valuable lesson (figure 196). The unique characteristics of thenear–isometric sidestick controller undoubtedly played a significant role. Simulations of the YF–16(AFFTC–TR–75–15) prior to first flight produced a very steep p c/Fas gradient with maximum stick forces of 4lb. In–flight simulation of YF–16 takeoffs and landings in the USAF/Calspan variable–stability NT–33 resultedin a decrease in the initial gradient by a factor of two. During a high–speed taxi test, a divergent lateralpilot–induced oscillation (PIO) was encountered on the prototype YF–16 after the aircraft inadvertentlybecame airborne (figure 197). The pilot, committed to fly, was then able to back off on his control gain, and thePIO stopped, after which a normal landing was made.481