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An experimental study of the sensitivity of helicopter rotor blade tracking to root pitch adjustment in hover
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Langston, Chester W. Singleton, Jeffrey D. Wilkie Sr., W. Keats Mirick, Paul H. Yeager Jr., William T. Wilbur, Matthew L. |
| Copyright Year | 1991 |
| Description | The sensitivity of blade tracking in hover to variations in root pitch was examined for two rotor configurations. Tests were conducted using a four bladed articulated rotor mounted on the NASA-Army aeroelastic rotor experimental system (ARES). Two rotor configurations were tested: one consisting of a blade set with flexible fiberglass spars and one with stiffer (by a factor of five in flapwise and torsional stiffnesses) aluminum spars. Both blade sets were identical in planform and airfoil distribution and were untwisted. The two configurations were ballasted to the same Lock number so that a direct comparison of the tracking sensitivity to a gross change in blade stiffness could be made. Experimental results show no large differences between the two sets of blades in the sensitivity of the blade tracking to root pitch adjustments. However, a measurable reduction in intrack coning of the fiberglass spar blades with respect to the aluminum blades is noted at higher rotor thrust conditions. |
| File Size | 563393 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920003771 |
| Archival Resource Key | ark:/13960/t3zs7ng9c |
| Language | English |
| Publisher Date | 1991-12-01 |
| Access Restriction | Open |
| Subject Keyword | Aeronautics (general) Pitching Moments Sensitivity Planforms Hovering Stability Rotor Blades Turbomachinery Airfoils Stiffness Aeroelasticity Torsion Rotary Wings Thrust Pitch Inclination Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
