Helicopter blade with a tip having a selected combination of swe

Details Helicopter blade with a tip having a selected combination of swe Helicopter blade with a tip having a selected combination of swe

1980-01-21

1982-06-15

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

F01D 512

Patent

active

043348289

ABSTRACT:
A helicopter blade of moderate twist having an improved tip utilizing a combination of sweep, taper and anhedral to improve hover performance by unloading the blade tip and reducing the strength of the tip vortex and displacing that tip vortex away from the following blade surface.

REFERENCES:
patent: 3399731 (1968-09-01), Giles
patent: 3721507 (1973-03-01), Monteleone
patent: 4077741 (1978-03-01), Lowson et al.
patent: 4130377 (1978-12-01), Blackwell
Weller, W. H., "Experimental Investigation of Effects of Blade Tip Geometry on Loads and Performance for an Articulated Rotor System", NASA Tech. Paper 1303, Avradcom Tech. RPT _78-53, Jan. 1979, pp. 1-76.

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