Blade structure for use in a windmill

Details Blade structure for use in a windmill Blade structure for use in a windmill

1979-06-21

1981-10-20

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Formed with main spar

416230, F03D 106, B64C 1126

Patent

active

042957907

ABSTRACT:
A tapered blade for use in a windmill comprises a main spar or beam assembly having top and bottom flat sheets of metal. Tapered angle strips are welded along the edges of the sheets. With the sheets and strips twisted to the proper angles, they are joined together by shear web channels welded along the edges of the strips. Leading and trailing edge assemblies, comprising primarily foam material, are bonded to the spar. A fitting is provided to permit the blade to be attached to the mechanism to be driven on the windmill.

REFERENCES:
patent: 2362301 (1944-11-01), Pecker
patent: 2648388 (1953-08-01), Haines et al.
patent: 2734586 (1956-02-01), Wright et al.
patent: 2981337 (1961-04-01), Stuart
patent: 3018832 (1962-01-01), Prewitt
patent: 3103977 (1963-09-01), Negroni
patent: 3484174 (1969-12-01), McCoubrey
patent: 3552881 (1971-01-01), Rogers et al.
patent: 4081220 (1978-03-01), Andrews

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