The Effect of Surface Irregularities on Wing Drag. I. Rivets and Spot Welds, 1, Rivets and Spot Welds

One of 111 reports in the series: NACA Special Reports available on this site.

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Tests have been conducted in the NACA 8-foot high-speed wind tunnel to determine the effect of exposed rivet heads and spot welds on wing drag. Most of the tests were made with an airfoil of 5-foot chord. The air speed was varied from 80 to 500 miles per hour and the lift coefficient from 0 to 0.30. The increases in the drag of the 5-foot airfoil varied from 6%, due to countersunk rivets, to 27%, due to 3/32-inch brazier-head rivets, with the rivets in a representative arrangement. The drag increases caused by protruding rivet heads were roughly proportional to the ... continued below

Creation Information

Hood, Manley J. February 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 383 times . More information about this report can be viewed below.

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  • Main Title: The Effect of Surface Irregularities on Wing Drag. I. Rivets and Spot Welds, 1, Rivets and Spot Welds
  • Series Title: NACA Special Reports

Description

Tests have been conducted in the NACA 8-foot high-speed wind tunnel to determine the effect of exposed rivet heads and spot welds on wing drag. Most of the tests were made with an airfoil of 5-foot chord. The air speed was varied from 80 to 500 miles per hour and the lift coefficient from 0 to 0.30. The increases in the drag of the 5-foot airfoil varied from 6%, due to countersunk rivets, to 27%, due to 3/32-inch brazier-head rivets, with the rivets in a representative arrangement. The drag increases caused by protruding rivet heads were roughly proportional to the height of the heads. With the front row of rivets well forward, changes in spanwise pitch had negligible effects on drag unless the pitch was more than 2.5% of the chord. Data are presented for evaluating the drag reduction attained by removing rivets from the forward part of the wing surface; for example, it is shown that over 70% of the rivet drag is caused by the rivets on the forward 30% of the airfoil in a typical case.

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  • URL: http://hdl.handle.net/2060/20090015308 External Link
  • Report No.: NACA-SR-76
  • Center for AeroSpace Information Number: 20090015308
  • Archival Resource Key: ark:/67531/metadc65149

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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

  • February 1, 1938

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

Description Last Updated

  • Nov. 30, 2016, 12:32 p.m.

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Hood, Manley J. The Effect of Surface Irregularities on Wing Drag. I. Rivets and Spot Welds, 1, Rivets and Spot Welds, report, February 1, 1938; (digital.library.unt.edu/ark:/67531/metadc65149/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.