The Effect of Bow Shape on Deck Wetness in Head Seas.
Experiments to examine the deck wetness process and to determine the effect of above water bow form on deck wetness in head seas were conducted in the 380 ft Towing Tank of the United States Naval Academy. A systematic series of bow forms, which flare and overhang were varied, was tested on a model...
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ftdtic:ADA146719 2023-05-15T17:33:41+02:00 The Effect of Bow Shape on Deck Wetness in Head Seas. Lloyd,A R J M NAVAL ACADEMY ANNAPOLIS MD DIV OF ENGINEERING AND WEAPONS 1984-04 text/html http://www.dtic.mil/docs/citations/ADA146719 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA146719 en eng http://www.dtic.mil/docs/citations/ADA146719 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Marine Engineering *SHIP DECKS *SHIP BOWS VELOCITY PROBABILITY SHIP MOTION MOTION WETTING FRIGATES SHIP MODELS WAVES Text 1984 ftdtic 2016-02-20T23:23:39Z Experiments to examine the deck wetness process and to determine the effect of above water bow form on deck wetness in head seas were conducted in the 380 ft Towing Tank of the United States Naval Academy. A systematic series of bow forms, which flare and overhang were varied, was tested on a model of the FFG7 frigate at one speed in irregular head waves corresponding to commonly occurring conditions in the North Atlantic in winter. It was found that above water bow form had remarkably little effect on relative motions or deck wetness and the greatest incidence of deck wetness occurred with one of the extremely flared forms. A new method of calculating the probability of deck wetness is proposed and verified. The calculation explains why the bows tested all had a similar performance and suggests that this is about the best that could be achieved at the chosen freeboard. Application of the calculation to a wider range of bow designs shows that a similar, near optimum, performance should be achieved providing in the flare and overhang are given certain minimum values. Excessive flare and overhang will not ensure improved performance. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database |
institution |
Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Marine Engineering *SHIP DECKS *SHIP BOWS VELOCITY PROBABILITY SHIP MOTION MOTION WETTING FRIGATES SHIP MODELS WAVES |
spellingShingle |
Marine Engineering *SHIP DECKS *SHIP BOWS VELOCITY PROBABILITY SHIP MOTION MOTION WETTING FRIGATES SHIP MODELS WAVES Lloyd,A R J M The Effect of Bow Shape on Deck Wetness in Head Seas. |
topic_facet |
Marine Engineering *SHIP DECKS *SHIP BOWS VELOCITY PROBABILITY SHIP MOTION MOTION WETTING FRIGATES SHIP MODELS WAVES |
description |
Experiments to examine the deck wetness process and to determine the effect of above water bow form on deck wetness in head seas were conducted in the 380 ft Towing Tank of the United States Naval Academy. A systematic series of bow forms, which flare and overhang were varied, was tested on a model of the FFG7 frigate at one speed in irregular head waves corresponding to commonly occurring conditions in the North Atlantic in winter. It was found that above water bow form had remarkably little effect on relative motions or deck wetness and the greatest incidence of deck wetness occurred with one of the extremely flared forms. A new method of calculating the probability of deck wetness is proposed and verified. The calculation explains why the bows tested all had a similar performance and suggests that this is about the best that could be achieved at the chosen freeboard. Application of the calculation to a wider range of bow designs shows that a similar, near optimum, performance should be achieved providing in the flare and overhang are given certain minimum values. Excessive flare and overhang will not ensure improved performance. |
author2 |
NAVAL ACADEMY ANNAPOLIS MD DIV OF ENGINEERING AND WEAPONS |
format |
Text |
author |
Lloyd,A R J M |
author_facet |
Lloyd,A R J M |
author_sort |
Lloyd,A R J M |
title |
The Effect of Bow Shape on Deck Wetness in Head Seas. |
title_short |
The Effect of Bow Shape on Deck Wetness in Head Seas. |
title_full |
The Effect of Bow Shape on Deck Wetness in Head Seas. |
title_fullStr |
The Effect of Bow Shape on Deck Wetness in Head Seas. |
title_full_unstemmed |
The Effect of Bow Shape on Deck Wetness in Head Seas. |
title_sort |
effect of bow shape on deck wetness in head seas. |
publishDate |
1984 |
url |
http://www.dtic.mil/docs/citations/ADA146719 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA146719 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA146719 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766132257359134720 |