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原文传递 Investigation of Helicopter Wire Strike Protection Concepts

题名：	Investigation of Helicopter Wire Strike Protection Concepts
作者：	Burrows, LeRoy T.;
关键词：	AVIATION SAFETY, CABLE CUTTING DEVICES, TRANSMISSION LINES, HELICOPTERS, AIRCRAFT EQUIPMENT, CAPTIVE TESTS, LANDING GEAR, GUY WIRES, DEFLECTORS, MECHANICAL CABLES, SKIDS.
摘要：	In-flight wire strikes pose a serious threat to low-level helicopter operations. Tests were conducted to determine the suitability for U. S. Army helicopter applications of the Canadian Wire Strike Protection System (WSPS), developed by Bristol Aerospace Limited. The WSPS consists of fuselage-mounted upper and lower cutters and a windshield centerpost deflector with a sawtooth cutter. Using the NASA/Langley Research Center Crash Impact Dynamics Facility, an OH-58A fitted with the WSPS was subjected to pendulum swing tests in which the helicopter struck fixed cables at approximately 40 knots airspeed. The system demonstrated the capability to easily sever 10,000-pound-strength 3/8- inch steel messenger cable, 50-pair copper communications cable, and 0.419-inch high-power transmission lines, including multiple arrays of those cables. Data acquired indicated that the wire impact/deflection/cutting sequence would not have a significant effect on helicopter performance, control crew functioning, or blade flapping. Installation of the WSPS on the entire Army tactical helicopter fleet is recommended. An additional test of a device to deflect wires past the helicopter skid gear, vertical stabilizer, and tail rotor was conducted. A 7/8-inch tubular steel deflector was designed and fabricated. The device proved to be inadequate. It was concluded that a skid gear deflector is not a practical OH-58A retrofit from a cost and weight standpoint.
总页数：	51
报告类型：	科技报告