Rotor blade tip planform

US7513750B2 · kind B2 · utility

Assignee

• SIKORSKY AIRCRAFT CORPORATION · US

Inventors

• Robert C. Moffitt · Seymour, US
• Thomas Alan Egolf · Stratford, US
• Robert D. Beatty · Trumbull, US
• John K. Karpowich · Trumbull, US
• Ashish Bagai · Hamden, US

Key dates

• Filing date: Mar 8, 2006
• Grant date: Apr 7, 2009
• Expiry date: Apr 10, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/463
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A main rotor blade incorporating a rotor blade tip region having a tip chord and a tip taper such that the ratio of the main rotor blade chord to the tip chord is approximately 0.30. The tip taper ratio preferably providing an approximately 28% area of reduction in said outer 10% of said blade span. The tip region preferably further including a hover optimized high lift airfoil and a tip sweep that reaches a constant value of approximately 30 degrees along the quarter chord line.