Estimation of hydrodynamic impact loads and pressure distributions on bodies approximating elliptical cylinders with special reference to water landings of helicopters

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An approximate method for computing water loads and pressure distributions on lightly loaded elliptical cylinders during oblique water impacts is presented. The method is of special interest for the case of emergency water landings of helicopters. This method makes use of theory developed and checked for landing impacts of seaplanes having bottom cross sections of V and scalloped contours. An illustrative example is given to show typical results obtained from the use of the proposed method of computation. The accuracy of the approximate method was evaluated through comparison with limited experimental data for two-dimensional drops of a rigid circular cylinder ... continued below

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Schnitzer, Emanuel & Hathaway, Melvin E April 1, 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 124 times . More information about this report can be viewed below.

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  • Main Title: Estimation of hydrodynamic impact loads and pressure distributions on bodies approximating elliptical cylinders with special reference to water landings of helicopters
  • Series Title: NACA Technical Notes

Description

An approximate method for computing water loads and pressure distributions on lightly loaded elliptical cylinders during oblique water impacts is presented. The method is of special interest for the case of emergency water landings of helicopters. This method makes use of theory developed and checked for landing impacts of seaplanes having bottom cross sections of V and scalloped contours. An illustrative example is given to show typical results obtained from the use of the proposed method of computation. The accuracy of the approximate method was evaluated through comparison with limited experimental data for two-dimensional drops of a rigid circular cylinder at a trim of 0 degrees and a flight -path angle of 90 degrees. The applicability of the proposed formulas to the design of rigid hulls is indicated by the rough agreement obtained between the computed and experimental results. A detailed computational procedure is included as an appendix.

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  • : 93R13089
  • URL: http://hdl.handle.net/2060/19930083799 External Link
  • Report No.: NACA-TN-2889
  • Center for AeroSpace Information Number: 19930083799
  • Archival Resource Key: ark:/67531/metadc56925

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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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  • April 1, 1953

Added to The UNT Digital Library

  • Nov. 16, 2011, 7:33 a.m.

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  • Feb. 1, 2017, 5:26 p.m.

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Schnitzer, Emanuel & Hathaway, Melvin E. Estimation of hydrodynamic impact loads and pressure distributions on bodies approximating elliptical cylinders with special reference to water landings of helicopters, report, April 1, 1953; (digital.library.unt.edu/ark:/67531/metadc56925/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.