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Twist-and-camber effects on the performance of simple hydro-sails for efficiently spreading penaeid trawls


Balash, C and Sterling, D and Lustica, M and Broadhurst, MK, Twist-and-camber effects on the performance of simple hydro-sails for efficiently spreading penaeid trawls, Ocean Engineering: An International Journal of Research and Development, 109 pp. 161-168. ISSN 0029-8018 (2015) [Refereed Article]

Copyright Statement

Crown Copyright 2015 Published by Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.oceaneng.2015.08.065


Penaeid-trawling fuel efficiency can be enhanced by using otter boards with high lift-to-drag ratios (L/D), which generally occurs at low angles of attack (AOA). The batwing otter board is such a low AOA solution; incorporating a unique towing arrangement and a high aspect ratio, flexible, hydro-sail to spread trawls with minimal seabed contact. This study investigated the effects of twist and camber on the performance of two simple batwing sails in a flume tank. Six degree-of-freedom loads were measured for AOAs between 0° and 40° for five twist and camber combinations. The major findings were that: (1) changing the mast rake angle from 30° to 45° reduced L/D at the design AOA of 20° by 12%, considering each sail’s optimum setting; (2) stall angle increased for the higher rake angle, despite the associated sail having the greater aspect ratio; (3) irrespective of rake angle, camber was positively associated with lift whereas twist decreased drag and substantially increased L/D at the design AOA; and (4) a L/D ratio of ∼3 was achieved or exceeded at 20° AOA for both sails, which is ∼3 times greater than for contemporary otter boards, implying a 20% drag reduction for otherwise equivalent penaeid-trawling systems.

Item Details

Item Type:Refereed Article
Keywords:batwing; drag reduction; fuel efficiency; lift-to-drag ratio; otter board; sail performance.
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ocean engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Balash, C (Dr Cheslav Balash)
UTAS Author:Lustica, M (Mr Michael Lustica)
ID Code:105331
Year Published:2015
Web of Science® Times Cited:10
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2015-12-18
Last Modified:2017-06-22

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