US 2019/0055012 A1Published application

Helicopter tail rotor blades and blade assemblies

AssigneeSikorsky Aircraft Corporation

InventorsKRZYSZTOF Kopanski, Daniel A. GRIFFITHS, Joshua A. BREON, Jonathan K. WONG, Benjamin ISABELLA, Michael Skylar LAWSON

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Abstract

A tail rotor blade for a helicopter includes a blade body defining a longitudinally extending spar cavity, a leading edge forward of the spar cavity, and a trailing edge aft of the spar cavity. Upper and lower airfoil surfaces extend from the leading edge to the trailing edge on opposite sides of the spar cavity. The upper and lower airfoil surfaces define between one another a constant airfoil segment and transition airfoil segments disposed longitudinally adjacent to the constant airfoil segment on inboard and outboard sides of the constant airfoil segment.

Claims15

Dependent claims

A blade, comprising:

a blade body defining:
a longitudinal spar cavity;
a leading edge forward of the spar cavity;
a trailing edge aft of the spar cavity;
an upper airfoil surface extending from the leading edge to the trailing edge;
and
a lower airfoil surface opposite the upper airfoil surface and extending from the leading edge to the trailing edge,
wherein the upper airfoil surface and the lower airfoil surface define therebetween a constant airfoil segment extending about the spar cavity and bounded longitudinally by a first transition airfoil segment and second transition airfoil segment, chords of the transition airfoil segments being shorter than a chord of the constant airfoil segment.

5 more elements

Dependencies are inferred from the claim text.