Air propellers in so far as the profile of their blades is conce

Details Air propellers in so far as the profile of their blades is conce Air propellers in so far as the profile of their blades is conce

1986-11-17

1988-09-27

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416242, 416DIG2, B63H 126

Patent

active

047738251

ABSTRACT:
The invention relates to improvements to air propellers in so far as the profile of their blades is concerned. The law of evolution of the curvatures of the extrados 2 is the following: the curvature, maximum at the leading edge A, increases first of all rapidly to reach a value of about 4 at the point B at about 4% of the length of the chord, and then decreases regularly to reach a substantially zero value at the trailing edge F. The law of evolution of the curvatures of intrados 3 is the following: the curvature, maximum at the leading edge A, decreases first of all rapidly to reach a value of about 8 at a point D at about 3.5% of the length of the chord, then decreases less rapidly to reach a zero value at a point E situated between 10% and 60% of the length of the chord, decreases further to a slightly negative value and then remains practically constant as far as the trailing edge F.

REFERENCES:
patent: 4413796 (1983-11-01), Bousquet
patent: 4455003 (1984-06-01), Hilbig

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