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http://dx.doi.org/10.3796/KSFT.2005.41.3.227

Experimental study on the estimating effective horse power of a bottom trawl ship  

Wang, Woo-Kyung (Training Ship, Yosu National University)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.41, no.3, 2005 , pp. 227-233 More about this Journal
Abstract
In order to estimate the effective horse power(EHP) in towing net of a bottom trawl ship, the ship's resistance was calculated by using a series data of Yamagata and Wigley formula. Also the effective horse power for a ship(EHPs) was estimated versus the ship speed in sailing and the propulsive efficiency was calculated with the brake horse power and the effective horse power. Then the effective horse power for a ship and a trawl net were estimated in the application of the propulsive efficiency in towing net. The total effective horse power($EHP_T$) was average 187.6kW and the effective horse power for a 1.awl net($EHP_n$) was average 176.7kW at a smooth sea state in towing net. The ratio of $EHP_n$ to $EHP_T$ was about 94.0% and the value was higher slightly than was already informed at a smooth sea state. The power for keeping up a townet speed was required more about 20% of a maximum continuous power at a rather rough sea state than a smooth sea state. In the future, if the residual resistance is considered with a sea state, $EHP_n$ will be estimated more correctly Also the data of EHP estimated by this method will be used as the basic data to design a trawl net.
Keywords
Effective horse power; Ship's resistance; Propulsive efficiency; Maximum continuous power; Townet speed;
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