e-ISSN 2231-8542
ISSN 1511-3701
Juhari Husin and Zainal Ashirin Shahardin
Pertanika Journal of Tropical Agricultural Science, Volume 7, Issue 3, December 1984
Keywords: Trawlers; simplified method of calculating propeller parameters.
Published on:
It is quite common to encounter a propeller installed on a trawl that does not develop adequate 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 (µ) and advance coefficient (?) the values of pitch- diameter ratios were obtained from propeller performance curve.
ISSN 1511-3701
e-ISSN 2231-8542