Accession Number : ADD006497

Title :   Rotor Blade Root End Attachment and Method of Manufacture.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Class ,Charles A ; Scarpati,Thomas S

Report Date : 05 Oct 1978

Pagination or Media Count : 24

Abstract : A helicopter spar root end and blade assembly for attachment to the rotary head of the helicopter, the spar includes the root end attachment having a series of formed apertures therein generally molded from strips of fiber reinforced tapes, and which tapes are turned from their disposition at the aperture for extension outboard of the blade to enhance its structural reinforcement against fatigue and fracture. The method for forming such a spar root end and blade assembly includes the disposition of a removable form for positioning of the resin treated tapes along the intended length of the spar root and blade, simultaneously positioning fiberglass sheets into the configuration of the intended blade assembly, and then compressing die halves into position around the tape and sheet formed assembly at a pressure and temperature for a stipulated period of time until the molded assembly and its inherent resin achieves curing and setting into its final and concise form. (Author)

Descriptors :   *Patent applications, *Rotor blades(Rotary wings), *Composite structures, Fiber reinforced composites, Tapes, Sheets, Epoxy resins, Spars, Fabrication

Subject Categories : Aircraft
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE