HIGH-PERFORMANCE-HELICOPTER PROGRAM, PHASE I
BELL HELICOPTER TEXTRON INC FORT WORTH TX
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A flight research program was conducted to ascertain whether the gains in range, productivity, and speed predicted by theory can be accomplished with a practical helicopter suitable for Army field use. The test results have proved that these gains can be accomplished without compromise of the utility or basic cargo space of the vehicle. Further, it was shown that structural loads and vibrations can be maintained within acceptable limits, as predicted, and that even higher speeds can be attained within existing technology. For the program, a YH-40 helicopter with UH-1B dynamic components was modified into a high-performance configuration. These modifications included aerodynamic changes to the fuselage, a new control system, and a tilting pylon system which allowed in-flight adjustment of fuselage attitude. Additionally, a new three- bladed rotor was fabricated which could be mounted to the mast either rigidly or through a gimbal universal joint.