REINFORCED PLASTIC LANDING GEAR FOR UH-1 HELICOPTER
HAYES INTERNATIONAL CORP BIRMINGHAM AL
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The primary objective of this program was to determine the feasibility of using reinforced plastic material for helicopter landing gears. A comprehensive design study was made, a fiber glass reinforced plastic landing gear system for the UH-1 helicopter was fabricated, and a full scale item was subjected to static and drop tests. Materials used for fabrication were Owens Corning S-994 HTS 901 twelve end glass roving and Union Carbide ER-2270 epoxy resin with methylnadic anhydride. Fabrication was accomplished by Cincinnati Testing Laboratories CTL by a wet winding process. Final design was based on the following properties Flexural Strength 183,000 psi Interlaminar Shear Strength 7,000 psi Compressive Strength 110,000 psi Flexural Modulus 8 x 106 psi. The static and drop tests demonstrated a high degree of ruggedness and durability. One of the two reinforced plastic members of the landing gear systems was subjected to four ultimate design static tests and fifteen drop tests without damage or failure. The other member was subjected to all tests except one of the static tests.