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1 edition of A sensitivity study of bow variants on the distribution of sea spray in regular head seas found in the catalog.

A sensitivity study of bow variants on the distribution of sea spray in regular head seas

David Thomas Sapone

A sensitivity study of bow variants on the distribution of sea spray in regular head seas

by David Thomas Sapone

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Published .
Written in English


About the Edition

There has always been a need and desire to improve upon the operability of ships at sea. The driving force behind making improvements can be safety, economic, or militarily oriented. This paper deals with improving a ship"s operability by studying the effects of bow flare on the quantity and distribution of spray across the main deck under varying environmental conditions. A 1:36 scaled model of a 3600 LT on displacement ship, resembling a U.S. Navy FFG-7 class combatant, was used throughout this study. The model was tested with four different bows with varying degrees of flare. A surfactant was added to the towing tank water to reduce the surface tension and increase the Weber Number in order to better simulate spray at the model scale. Environmental conditions imposed were regular head seas of a mean sea state 6 and generated true wind equivalent to 32 knots. One bow form was first tested in ordinary tank water so that a comparison could be made between the two surface tension conditions. A 64% reduction in surface tension was achieved through the addition of the brand name surfactant AEROSOL OT-75. Though this value is relatively great, it corresponds to a Weber Number that is 22 times smaller then the required full scale value. The visual effect on the spray was to cause a finer droplet size and break up of the water sheet that normally is present rolling off the bow. With respect to the measurements taken, the reduction in surface tension resulted in; (a) a smaller volume of spray water being captured, (b) a change in the density distribution of the spray across the main deck, and (c) an increase in the wetted area on the main decking. In the absence of any specific spray criteria in which to judge each bow"s performance against, the general trend was to reduce the quantity of spray water delivered and limit its distribution with an increase in the bow flare. The one knuckled bow that was tested performed much worst then any of the conventionally flared bows.

Edition Notes

Statementby David Thomas Sapone
ContributionsMassachusetts Institute of Technology
The Physical Object
Pagination110 leaves :
Number of Pages110
ID Numbers
Open LibraryOL25507246M
OCLC/WorldCa24279044

IMO e-Reader EE Particularly Sensitive Sea Areas (PSSA), Edition. Compilation of all guidance documents and PSSAs designated by IMO since A Particularly Sensitive Sea Area (PSSA) is an area of the marine environment that needs special protection through action by the International Maritime Organization (IMO) because of its significance for recognized ecological, socio-economic, or Price: $ painted gloss sea blue, the standard naval paint scheme of the day Despite its later serial num-ber, the XFJ-2B () was actually the first of the three prototypes to fly, taking off on its maiden flight on Decem with test pilot Robert Hoover at the controls. It went out to Inyokern, California for armament tests. The first XFJ

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Report of the STUDY GROUP ON BASS 18–22 August Lowestoft, England This report is not to be quoted without prior consultation with the General Secretary. The document is a report of an Expert Group under the auspices of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council.   The pop-up locations were estimated to be beyond the Scotian Shelf for five of the eels, at a great-circle distance (that is, the shortest distance between two points on the surface of a sphere Cited by:


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A sensitivity study of bow variants on the distribution of sea spray in regular head seas by David Thomas Sapone Download PDF EPUB FB2

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