Hydrodynamic Impact Loads of a -20 Degree Dead-Rise Inverted-V Model and Comparisons With Loads of a Flat-Bottom Model Page: 2 of 37
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TECH LIBRARY KAFB, NM
NATIONAL ADVISORY C(MMITEE FOR AERONAUTI(06
0067222
TECHNICAL NOTE 4339
HYDRODYNAMIC IMPACT LOADS OF
A -200 DEAD-RISE INVERTED-V MODEL AND COMPARISONS WITH
LOADS OF A FLAT-BOTTOM MODEL
By Philip M. Edge, Jr.
SUMMARY
As part of a study of hydrodynamic impact loads on chine-immersed
bodies, a model having an inverted-V transverse shape and a dead-rise
angle of -200 was tested at the Langley impact basin. A series of fixed-
trim impacts of this inverted-V model were made in smooth water over a
wide range of trim and initial flight-path angles at a beam-loading
coefficient of 19.15 with a few impacts at beam-loading coefficients of
27.90 and 36.07.
The data are presented in tables and in figures.as variations of
loads and motions (in coefficient form) with time, trim angle, and
Sflight-path angle. In general, the maximum impact loads experienced by
the inverted-V model were greater than the loads which have been obtained
for a flat-bottom model; however, for the severe impact conditions
approaching 00 trim (flat impacts) a trend toward smaller loads than
those experienced on a flat bottom is indicated. Peak pressures for the
inverted-V transverse shape compare with those for the flat-bottom model
in a manner similar to the maximum impact loads.
INTRODUCTION
Investigations of hydrodynamic impact loads on chine-immersed bodies
at the Langley impact basin have included several transverse shapes
(refs. 1 to 4). Reference 1 presented loads for a flat-bottom (00 dead-
rise angle) model and references 2 to 1- presented loads for models having
positive dead-rise angles and V and curved transverse shapes. These
investigations have indicated the relation of maximum loads to transverse
shape for chine-immersed models of zero and positive dead-rise angles.
The present investigation extends this study beyond the flat plate to
the inverted-V shape with a -200 dead-rise angle.
Configurations having negative dead-rise angles are of interest
from the standpoint of the unconventional flow of water from the instant
of initial contact as compared with impacts of bodies having positive
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Edge, Philip M., Jr. Hydrodynamic Impact Loads of a -20 Degree Dead-Rise Inverted-V Model and Comparisons With Loads of a Flat-Bottom Model, report, August 1958; (https://digital.library.unt.edu/ark:/67531/metadc57395/m1/2/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.