Analysis of the Performance of a 140-Foot Great Lakes Icebreaker: USCGC Katmai Bay

This report presents the results of the tests on the new U.S. Coast Guard 140-ft icebreaker Katmai Bay (WTGB-101) in the level plate ice and brash ice in Whitefish Bay and the St. Marys River. The results indicate that the vessel can penetrate 22 in. of level freshwater ice with 2-3 in. of snow cove...

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Bibliographic Details
Main Author: Vance,George P
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1980
Subjects:
Snow
Ice and Permafrost
Marine Engineering
*ICEBREAKERS
PERFORMANCE TESTS
SURFACE ROUGHNESS
ICE
BUBBLES
RIVERS
FRICTION
CHANNELS(WATERWAYS)
SHIP HULLS
COMPRESSED AIR
GREAT LAKES
COAST GUARD SHIPS
TUGBOATS
LAKE SUPERIOR
WTGB-101
Saint Marys River(Michigan)
Air bubbler systems
St. Marys River
Ice
Icebreaker
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA084736
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA084736
Description
Summary:This report presents the results of the tests on the new U.S. Coast Guard 140-ft icebreaker Katmai Bay (WTGB-101) in the level plate ice and brash ice in Whitefish Bay and the St. Marys River. The results indicate that the vessel can penetrate 22 in. of level freshwater ice with 2-3 in. of snow cover. It can also penetrate up to 48 in. of brash ice in a continuous mode and at least 30 in. of plate ice by backing and ramming. The installed bubbler system decreased the required power of the vessel from 10 to 30% in brash ice and 25 to 35% in level ice. The low friction coating appears to be effective in decreasing the friction factor when it remains intact; when it peels off it appears to make conditions worse than plain paint. An average dynamic friction factor of 0.15 could be used over the entire hull for these tests. (Author)

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