Accession Number : ADA137770

Title :   Crew Survivable Helicopter Undercarriage.

Descriptive Note : Final rept. Jul 82-Oct 83,

Corporate Author : VOUGHT CORP DALLAS TX

Personal Author(s) : Gannon,B T ; Maris,J L ; Waldrop,P S

PDF Url : ADA137770

Report Date : Jan 1984

Pagination or Media Count : 62

Abstract : The program goal was to demonstrate the energy absorbing capability of the Vought 'rotated' sine wave concept for helicopter fuselage under-carriage structure. Specific program objectives were to develop design and manufacturing procedures for energy absorbing aluminum structure, fabricate and test specimens to confirm the methods and relate the slow and high rate test results to undercarriage structure designed to meet MIL-STD-1290 criteria. The specimens were fabricated in a standard sheet metal shop, without special attention. There are several cost and weight advantages associated with the sine wave concept. The cost savings relative to conventional metal design are attributable to the reduction in number of parts and fasteners which saves material dollars and assembly hours. The high-rate and slow-rate testing of the test elements verified the performance of the energy absorbing structure developed in this program. The selected skin gage to meet the 200 lbs/in. running load requirement is 0.063 inch. The substructure will carry normal load requirement is 0.063 inch. The substructure will carry normal flight loads and provide the energy absorbing capability when necessary. (Author)

Descriptors :   *Helicopters, *Aluminum, *Crashworthiness, Survival(Personnel), Fuselages, Energy absorbers, Structural properties, Test methods, Drop tests, Sine waves, Low rate, High rate, Loads(Forces), Airframes, Wings, Experimental design, Tables(Data)

Subject Categories : Helicopters
      Metallurgy and Metallography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE