Accession Number : AD0701925

Title :   AERIAL ARMORED FUSELAGE ENGINEERING AND MANUFACTURING REPORT PART 1.

Descriptive Note : Final technical rept. 1 Jul 69-15 Feb 70,

Corporate Author : UNITED AIRCRAFT CORP STRATFORD CONN SIKORSKY AIRCRAFT DIV

Personal Author(s) : Burr,Carleton W. ; Degnan,William G. ; Grumm,Arthur W. ; McCaul,Colin O.

Report Date : FEB 1970

Pagination or Media Count : 81

Abstract : Manufacturing methods and techniques were evaluated for the use of advanced armor as the basic structural material of a helicopter fuselage. A standard threat was established based on the environment and experience of the helicopter in Viet Nam. Four armor materials were studied and dual hardness steel armor proved to be more cost effective than other materials. A prismatic fuselage shape was found to be optimal. Ballistic test panels of joined armor were fabricated. A full scale mock-up of an Aerial Armored Personnel Carrier using dual hardness steel armor as the structural material for the fuselage was fabricated to further explore the manufacturing methods and techniques developed. Potential problem areas were identified and recommendations provided. Manufacturing methods of cutting, joining and finishing were studied. The best cutting methods employed were flame cutting and abrasive cutoff, although plasma cutting warrants further consideration. The best joining method employed was gas tungsten arc welding although automatic plasma arc welding would be considered for production. The best finishing method for the size and shape of a helicopter fuselage was a sprayed epoxy resin system on a zincilate base. A preliminary conceptual helicopter design study resulted in an armor-hulled aircraft with a gross weight of 14,279 pounds, a dash speed of 125 knots, and a cruise speed of 80 knots carrying 12 troops and pilot for three hours' endurance. The power plant included 2 advanced technology engines providing 3000 horsepower total. Hover performance is based on Army hot day criteria. (Author)

Descriptors :   (*HELICOPTERS, FUSELAGES), (*FUSELAGES, ARMOR PLATE), (*ARMOR PLATE, MANUFACTURING), STEEL, COST EFFECTIVENESS, CONFIGURATION, CUTTING, JOINING, ARC WELDING, ZINC COATINGS, PLASTIC COATINGS, EPOXY RESINS, DESIGN

Subject Categories : Helicopters
      Fabrication Metallurgy
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE