A Simplified Method of Calculating Propeller Parameters for Small Trawlers

Husin, Juhari and Shahardin, Zainal Ashirin (1984) A Simplified Method of Calculating Propeller Parameters for Small Trawlers. Pertanika, 7 (3). pp. 67-78.

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Abstract

It is quite common to encounter a propeller installed on a trawl that does not develop adaquate thrust to pull the trawl at a specified trawling speed. The immediate actions usually taken are to reduce the size of a trawl, change to a new propeller or install a higher powered engine. All these alternatives will impose a financial strain on the fishermen. Therefore, a simple method of calculation is being suggested to obtain a spectrum of propeller parameters such as diameter, pitch- diameter ratio, speed, quasipropulsive coefficient and propeller performance coefficient for a given engine model. The best combination of parameters can be obtained in order to satisfy a specific trawling requirement. Usually the requirement is stated in the form of thrust of propeller to overcome total gear drag at a specific trawling speed. Total gear drag can be determined by a model test or mathematical modelling. Three engine models have been studied and for each model values of thrusts, propeller performance coefficients and quasi- propulsive coefficient were calculated. Having known the values of torque coefficient (J.l) and advance coefficient (¢) the values of pitch- diameter ratios were obtained from propeller performance curve.

Item Type:Article
Keyword:Trawlers, simplified method of calculating propeller parameters
ID Code:2230
Deposited By: Nur Izyan Mohd Zaki
Deposited On:11 Nov 2009 07:47
Last Modified:27 May 2013 06:59

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