Rotor blade assembly with high pitching moment airfoil...

Details Rotor blade assembly with high pitching moment airfoil... Rotor blade assembly with high pitching moment airfoil...

2005-07-22

2009-06-16

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

C416S22300B, C416S237000, C416SDIG004

Reexamination Certificate

active

07547193

ABSTRACT:
A main rotor blade assembly with a high negative pitching moment airfoil section having a pitching moment coefficient beyond (more negative than) −0.035 at Mach Numbers below 0.80 and a blade taper of 1:5 or greater.. The main rotor blade preferably limits blade torsional bending and an aft loaded tip airfoils to approximately ‘no more’ than that of conventional effective rotor blade designs based on conventional tip airfoil sections.

REFERENCES:
patent: 3822105 (1974-07-01), Jepson
patent: 4427344 (1984-01-01), Perry
patent: 5205715 (1993-04-01), Perry et al.
patent: 5246344 (1993-09-01), Perry
patent: 5419513 (1995-05-01), Flemming et al.

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