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Helicopter blade longitudinal member and relative manufacturing method

  • US 4,650,534 A
  • Filed: 10/16/1984
  • Issued: 03/17/1987
  • Est. Priority Date: 10/26/1983
  • Status: Expired due to Term
First Claim
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1. Method for manufacturing a longitudinal member (1) for a helicopter blade, the method being characterized by the fact that it comprises the steps of opening a curing mold (21) having an inner shape which matches the outer shape of the longitudinal member being formed;

  • lining a portion of said mold with a portion of a number of cloth strips (7) made of uncured synthetic composite material to form an outer covering (6) for said longitudinal member;

    placing a nose (10), made of uncured synthetic composite material, on said cloth strips;

    laying a number of axial straps (17), made of uncured synthetic composite material, on said outer covering (6) and on opposite sides of a removal core (25) disposed in said mold and covered with a strip (5) to provide an inner core (4) for said longitudinal member and form top (15) and bottom (16) backs for said intermediate body (9);

    inserting into said mold a rear element (18), made of prehardened synthetic composite material and having a C-shaped section, and contacting the covered core (25) and laterally contacting said straps (17) therewith;

    applying pressure on said straps (17) against said nose (10) and said outer covering (6) and inner cover (4);

    folding the side edges of said outer strips (7) and overlapping the same with each other and with said rear element (18); and

    closing said mold.

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