YHU-1B CATEGORY I PERFORMANCE, STABILITY AND CONTROL TESTS
AIR FORCE TEST CENTER EDWARDS AFB CA
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The YHU-1B was tested by the Air Force Flight Test Center to gather limited performance and stability and control data to determine whether the helicopter will meet performance guarantees and to insure that no serious stability and control problems exist. The flying qualities of the YHU-1B were very good. In general, the flying qualities were improved over the earlier HU-1 series. This improvement stemmed primarily from the absence of the objectionable pitch and roll oscillations which were present in the HU-1. Control sensitivities were approximately equal, with a small decrease in pitch sensitivity being apparent in the YHU-1B. Control response of the two aircraft was approximately equal in pitch and roll, but the HU-1 developed a slightly greater yaw rate. Static and dynamic stability of the YHU-1B was generally good. The helicopter met all requirements for range, hovering, cruise speed, and service ceiling.