The effect of compressibility on eight full-scale propellers operating in the take-off and climbing range

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Tests were made of eight full-scale propellers of different shape at various tip speeds up to about 1,000 feet per second. The range of blade-angle settings investigated was from 10 degrees to 30 degrees at the 0.75 radius. The results indicate that a loss in propulsive efficiency occurred at tip speeds from 0.5 to 0.7 the velocity of sound for the take-off and climbing conditions. As the tip speed increased beyond these critical values, the loss rapidly increased and amounted, in some instances, to more than 20 percent of the thrust power for tip-speed values of 0.8 the speed of ... continued below

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Biermann, David & Hartman, Edwin P. January 1, 1938.

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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 83 times . More information about this report can be viewed below.

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  • Main Title: The effect of compressibility on eight full-scale propellers operating in the take-off and climbing range
  • Series Title: NACA Technical Reports

Description

Tests were made of eight full-scale propellers of different shape at various tip speeds up to about 1,000 feet per second. The range of blade-angle settings investigated was from 10 degrees to 30 degrees at the 0.75 radius. The results indicate that a loss in propulsive efficiency occurred at tip speeds from 0.5 to 0.7 the velocity of sound for the take-off and climbing conditions. As the tip speed increased beyond these critical values, the loss rapidly increased and amounted, in some instances, to more than 20 percent of the thrust power for tip-speed values of 0.8 the speed of sound. In general, as the blade-angle setting was increased, the loss started to occur at lower tip speeds. The maximum loss for a given tip speed occurred at a blade-angle setting of about 20 degrees for the take-off and 25 degrees for the climbing condition. A simplified method for correcting propellers for the effect of compressibility is given in an appendix.

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  • Accession or Local Control No: 93R21004
  • URL: http://hdl.handle.net/2060/19930091714 External Link
  • Report No.: NACA-TR-639
  • Center for AeroSpace Information Number: 19930091714
  • Archival Resource Key: ark:/67531/metadc66297

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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).

Technical Report Archive and Image Library

This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

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Creation Date

  • January 1, 1938

Added to The UNT Digital Library

  • Nov. 17, 2011, 10:13 p.m.

Description Last Updated

  • March 27, 2018, 1:13 p.m.

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Biermann, David & Hartman, Edwin P. The effect of compressibility on eight full-scale propellers operating in the take-off and climbing range, report, January 1, 1938; (digital.library.unt.edu/ark:/67531/metadc66297/: accessed April 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.