Roll formed blade structure

Details Roll formed blade structure Roll formed blade structure

1978-04-03

1981-06-30

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Formed with main spar

416230, B64C 1126

Patent

active

042759943

ABSTRACT:
A helicopter main rotor blade comprised of roll formed structure is provided. A C-shaped nose spar, a closure channel, a protective strip and a nose block are all roll formed. The nose spar extends the length of the leading edge of the helicopter blade, and is open to the rear between upper and lower trailing edge skins. The nose spar is flared adjacent the root whereby the trailing edges of the nose spar diverge from the leading edge as the nose spar extends toward the blade root. The closure channel is attached to the inside surfaces of the upper and lower trailing edges of the nose spar. The closure channel diverges from the leading edge as it extends toward said root. The protective strip is secured to a lead portion of the nose spar to capture a nose block against the leading edge of the nose spar. A trailing blade skin is held against upper and lower outer trailing surfaces of the nose spar by means of body doublers extending from the trailing edges of the protective strip and overlaying the trailing edges of the spar over the closure channel. Flats exist because the airfoil element comprising the upper and lower trailing edges of the nose spar and the closure channel diverge from normal positions in the airfoil. The flat diverges with the flare of the spar and is faired into blade contour. Where the flat extends to a section of the airfoil thinner than the flat, it is faired into the airfoil with a bulge aft.

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