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Helicopter anti-torque system using strakes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wilson, J. C. Kelley, H. L. |
| Copyright Year | 1984 |
| Description | A helicopter is disclosed with a system for controlling main-rotor torque which reduces the power and size requirements of conventional anti-torque means. The torque countering forces are generated by disrupting the main rotor downwash flowing around the fuselage. The downwash flow is separated from the fuselage surface by a strake positioned at a specified location on the fuselage. This location is determined by the particular helicopter wash pattern and fuselage configuration, generally being located between 20 deg before top dead center (TDC) and 80 deg from TDC on the fuselage side to which the main rotor blade approaches during rotation. The strake extends along the fuselage from the cabin section to the aft end and can be continuous or separated for aerodynamic surfaces such as a horizontal stabilizer. |
| File Size | 902061 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840025329 |
| Archival Resource Key | ark:/13960/t3jx36q6t |
| Language | English |
| Publisher Date | 1984-09-11 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Air Flow Strakes Torque Drag Reduction Stabilizers Fluid Dynamics Helicopters Downwash Fuselages Separated Flow Circulation Control Airfoils Rotary Wings Aerodynamic Loads Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
