Hydrodynamic and aerodynamic tests of a family of models of seaplane floats with varying angles of dead rise - N.A.C.A. Models 57-A, 57-B, and 57-C

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Three models of V-bottom floats for twin-float seaplanes (N.A.C.A. models 57-A, 57-B, and 57-C) having angles of dead rise of 20 degrees, 25 degrees, and thirty degrees, respectively, were tested in the N.A.C.A. tank and in the N.A.C.A. 7- by 10-foot wind tunnel. Within the range investigated, the effect of angle of dead rise on water resistance was found to be negligible at speeds up to and including the hump speed, and water resistance was found to increase with angle of dead rise at planing speeds. The height of the spray at the hump speed decreased with increase in angle ... continued below

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Parkinson, John B.; Olson, Roland E. & House, Rufus O. July 1, 1939.

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  • Main Title: Hydrodynamic and aerodynamic tests of a family of models of seaplane floats with varying angles of dead rise - N.A.C.A. Models 57-A, 57-B, and 57-C
  • Series Title: NACA Technical Notes

Description

Three models of V-bottom floats for twin-float seaplanes (N.A.C.A. models 57-A, 57-B, and 57-C) having angles of dead rise of 20 degrees, 25 degrees, and thirty degrees, respectively, were tested in the N.A.C.A. tank and in the N.A.C.A. 7- by 10-foot wind tunnel. Within the range investigated, the effect of angle of dead rise on water resistance was found to be negligible at speeds up to and including the hump speed, and water resistance was found to increase with angle of dead rise at planing speeds. The height of the spray at the hump speed decreased with increase in angle of dead rise and the aerodynamic drag increased with dead rise. Lengthening the forebody of model 57-B decreased the water resistance and the spray at speeds below the hump speed. Spray strips provided an effective means for the control of spray with the straight V sections used in the series but considerably increased the aerodynamic drag. Charts for the determination of the water resistance and the static properties of the model with 25 degrees dead rise and for the aerodynamic drag of all the models are included for use in design.

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  • : 93R10775
  • URL: http://hdl.handle.net/2060/19930081485 External Link
  • Report No.: NACA-TN-716
  • Center for AeroSpace Information Number: 19930081485
  • Archival Resource Key: ark:/67531/metadc54485

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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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  • July 1, 1939

Added to The UNT Digital Library

  • Nov. 14, 2011, 10:28 p.m.

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  • Jan. 31, 2017, 5:09 p.m.

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Parkinson, John B.; Olson, Roland E. & House, Rufus O. Hydrodynamic and aerodynamic tests of a family of models of seaplane floats with varying angles of dead rise - N.A.C.A. Models 57-A, 57-B, and 57-C, report, July 1, 1939; (digital.library.unt.edu/ark:/67531/metadc54485/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.