Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight

One of 1,424 reports in the series: NACA Technical Reports available on this site.

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Description

"Theoretically derived charts and equations are presented by which tail-rotor design studies of directional trim and control response at low forward speed can be conveniently made. The charts can also be used to obtain the main-rotor stability derivatives of thrust with respect to collective pitch and angle of attack at low forward speeds. The use of the charts and equations for tail-rotor design studies is illustrated. Comparisons between theoretical and experimental results are presented. The charts indicate, and flight tests confirm, that the region of vortex roughness which is familiar for the main rotor is also encountered by the tail ... continued below

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22 p.

Creation Information

Amer, Kenneth B. & Gessow, Alfred October 27, 1953.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and one other and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 333 times , with 8 in the last month . More information about this report can be viewed below.

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  • Main Title: Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight
  • Series Title: NACA Technical Reports

Description

"Theoretically derived charts and equations are presented by which tail-rotor design studies of directional trim and control response at low forward speed can be conveniently made. The charts can also be used to obtain the main-rotor stability derivatives of thrust with respect to collective pitch and angle of attack at low forward speeds. The use of the charts and equations for tail-rotor design studies is illustrated. Comparisons between theoretical and experimental results are presented. The charts indicate, and flight tests confirm, that the region of vortex roughness which is familiar for the main rotor is also encountered by the tail rotor and that prolonged operation at the corresponding flight conditions would be difficult" (p. 1).

Physical Description

22 p.

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  • Accession or Local Control No: 93R21516
  • URL: http://hdl.handle.net/2060/19930092226 External Link
  • Report No.: NACA-TR-1216
  • Center for AeroSpace Information Number: 19930092226
  • Archival Resource Key: ark:/67531/metadc60598

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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Creation Date

  • October 27, 1953

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

Description Last Updated

  • June 22, 2018, 9:13 a.m.

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Amer, Kenneth B. & Gessow, Alfred. Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight, report, October 27, 1953; (digital.library.unt.edu/ark:/67531/metadc60598/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.