Rotor blade tip section

Details Rotor blade tip section Rotor blade tip section

2005-12-20

2005-12-20

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Formed with main spar

C416S237000

Reexamination Certificate

active

06976829

ABSTRACT:
A main rotor blade includes a tip section having a splice cap, a structural tip spar, a core and an upper and lower tip skin. The tip section is mounted to a central blade section by mounting the tip spar to a main blade spar. The tip spar includes a first surface substantially parallel to a second surface. The first and second surfaces each extend from a shear web therebetween to define the generally C-shape in cross section. The shear web generally carries rotor blade torsional loads and eliminates the heretofore required structural core. A section of the tip spar overlaps a section of the main blade spar. The tip section thereby transfers the loads carried thereby through interaction between the overlapped spar sections. The tip section core and skins need not be structural members as the tip spar carries rotor blade tip section torsional loads.

REFERENCES:
patent: 3721507 (1973-03-01), Monteleone
patent: 4120610 (1978-10-01), Braswell et al.
patent: 5320494 (1994-06-01), Reinfelder et al.
patent: 5885059 (1999-03-01), Kovalsky et al.
patent: 5954898 (1999-09-01), McKague et al.
patent: 6168383 (2001-01-01), Shimizu
patent: 6231308 (2001-05-01), Kondo et al.

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