A Simplified Method of Calculating Propeller Parameters for Small Trawlers
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 alt...
| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
1984
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| Online Access: | http://psasir.upm.edu.my/id/eprint/2230/ http://psasir.upm.edu.my/id/eprint/2230/1/A_Simplified_Method_of_Calculating_Propeller.pdf |
| _version_ | 1848839188565196800 |
|---|---|
| author | Husin, Juhari Shahardin, Zainal Ashirin |
| author_facet | Husin, Juhari Shahardin, Zainal Ashirin |
| author_sort | Husin, Juhari |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T07:07:29Z |
| format | Article |
| id | upm-2230 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:07:29Z |
| publishDate | 1984 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-22302013-05-27T06:59:42Z http://psasir.upm.edu.my/id/eprint/2230/ A Simplified Method of Calculating Propeller Parameters for Small Trawlers Husin, Juhari Shahardin, Zainal Ashirin 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. 1984 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/2230/1/A_Simplified_Method_of_Calculating_Propeller.pdf Husin, Juhari and Shahardin, Zainal Ashirin (1984) A Simplified Method of Calculating Propeller Parameters for Small Trawlers. Pertanika, 7 (3). pp. 67-78. English |
| spellingShingle | Husin, Juhari Shahardin, Zainal Ashirin A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title | A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title_full | A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title_fullStr | A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title_full_unstemmed | A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title_short | A Simplified Method of Calculating Propeller Parameters for Small Trawlers |
| title_sort | simplified method of calculating propeller parameters for small trawlers |
| url | http://psasir.upm.edu.my/id/eprint/2230/ http://psasir.upm.edu.my/id/eprint/2230/1/A_Simplified_Method_of_Calculating_Propeller.pdf |