Helicopter rotor blade

Details Helicopter rotor blade Helicopter rotor blade

1975-11-06

1977-05-10

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Formed with main spar

416233, B64C 2746

Patent

active

040225461

ABSTRACT:
A helicopter main rotor has blades with an inboard airfoil having a high lift-drag ratio for efficient hovering and a "shock-free" outboard airfoil for high speed cruise. Each rotor blade has a structural section composed of metal spars and metal skins forming torque boxes accompanied by a nonstructural fairing and after body. Secured within the torque boxes and the after body are honeycomb cellular structures of a metallic and nonmetallic material, depending on the area wherein the cellular structure is secured. At a point along the blade radius, between 60% and 75%, the upper metal skin of the aft torque box changes from an outer contour surface of the blade to a flat surface parallel to and above the cord line. A fairing of fiberglass skin is secured over a nonmetallic cellular structure over the flat surface of the upper metal skin to complete the upper outer airfoil contour outboard of the 75% radius dimension. The lower outer airfoil contour is the metal skin of the aft torque box followed by a fiberglass skin joined at a trailing edge with the fiberglass upper surface.

REFERENCES:
patent: 2674327 (1954-04-01), Pullin et al.
patent: 2694458 (1954-11-01), Stevens
patent: 2734586 (1956-02-01), Wright et al.
patent: 2884078 (1959-04-01), Stamm et al.
patent: 3155166 (1964-11-01), Stulen et al.
patent: 3333642 (1967-08-01), Kee
patent: 3484174 (1969-12-01), McCoubrey
patent: 3528753 (1970-09-01), Dutton et al.
patent: 3552881 (1971-01-01), Rogers et al.
patent: 3713751 (1973-01-01), Fradenburgh et al.
patent: 3813186 (1974-05-01), Palachek et al.

Affiliated with

Also associated with

Rating

Helicopter rotor blade does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Helicopter rotor blade, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Helicopter rotor blade will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1980650