![]() ![]() The present invention is directed to an improved airfoil for use with a helicopter rotor and more particularly to an airfoil section for at least partial use on a main rotor blade of a helicopter rotor.Ĭonventional rotary-wing aircraft have a forward airspeed limited by a number of factors. The section as recited in claim 1, wherein said airfoil profile section extends into a main section of said main rotor blade. The section as recited in claim 1, wherein said X/C values in Table I are unchanged.ĥ. The section as recited in claim 1, wherein said airfoil profile section is defined by a scaled set of coordinates in which said set of Y/C coordinates listed in Table I are scaled by a factor of 1.2 while said X/C values are unchanged.Ĥ. The main rotor blade as recited in claim 1, wherein said tip region is defined by an outboard 15% of the main rotor blade.ģ. A main rotor blade of a single rotor helicopter comprising: a tip region of a main rotor blade, said tip region including an airfoil profile section which defines an airfoil thickness along a chord line within said airfoil profile section, said airfoil profile section having leading edge and a trailing edge, an upper airfoil surface and a lower airfoil surface which extend between said leading edge and said trailing edge as defined by a set of coordinates in which an airfoil thickness is plotted against a non-dimensional distance from said leading edge of said airfoil profile section along said chord line, as a set of Y/C coordinates scaled by a desired factor at a given X/C as listed in Table I, wherein X is the linear displacement along the chord line extending between the leading edge and the trailing edge, C is the chordal length of the airfoil cross section measured between the airfoil leading edge and the airfoil trailing edge and Y is a transverse displacement of the airfoil surface from the chord line.Ģ. High performance blade for helicopter rotorġ. Helicopter rotor speed changing transmissionīlade section for rotating wings of an aircraftįamily of airfoil shapes for rotating blades Rotary-wing blade of rotary-wing aircraftīlade for aircraft rotary wings, with swept-back tip Rotor blade with optimized twist distributionīlade profile for aircraft rotor and rotor comprising sameīlade with reduced sound signature, for aircraft rotating aerofoil, and rotating aerofoil comprising such a bladeīlade with swept-back tip for the rotary wings of an aircraftĪirfoiled blade for cargo transport aircraft ![]() Rotor blade assembly with high pitching moment airfoil section for a rotary wing aircraft ![]() Rotor blade twist distribution for a high speed rotary-wing aircraft Rotor blade for a high speed rotary-wing aircraft ![]()
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