This report contains the results of the aerodynamic evaluation flight tests on HH-53B, USAF Serial Number 66-14433, conducted by the Aerodynamics Branch, Directorate of Flight Test Engineering, 4950th Test Wing, WPAFB, Ohio. These tests were conducted for the Special Projects Division, Specialized Aircraft Program Office, ASD, which was responsible for the program management of the Pave Low III modification on the HH-53B. The objectives of this test were to quantitatively determine the effects of a radome modification on: the stability and control characteristics of the helicopter, changes in the range/cruise and rate of climb/descent performance from a standard HH-53B helicopter, accuracy of the airspeed system, aircraft vibration and air load stresses associated with the radome fairing and supporting structure, and the response characteristics of the standard hydraulic system during maneuvering flight. Longitudinal stability was the only flying quality characteristic of the helicopter that was affected by the radome. The longitudinal damping decreased slightly, but presented no handling problem for the pilot. The range/cruise performance did not change significantly, but the best cruise airspeeds decreased. The climb/descent curves changed somewhat and the airspeed position error curve changed. It was recommended that these new performance curves be incorporated into the flight manual and more extensive performance testing be accomplished if this modification is to become a Class V modification. The radome proved to be structurally sound throughout the original flight envelope of the aircraft.
Pave Low III Aerodynamic Evaluation
1976
87 pages
Report
No indication
English
Aircraft , Helicopters , Radomes , Search radar , Flight crews , Search and rescue , Night , Rescues , Recovery , Radar , Modification , Stability , Control , Aerodynamic characteristics , Flight testing , Performance(Engineering) , Pave low project , HH-53B aircraft , H-53 aircraft , Flight characteristics
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