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Parameters affecting the performance of the c-class wingsail

Parameters affecting the performance of the c-class wingsail
Parameters affecting the performance of the c-class wingsail
Wing sails offer a different design challenge to those of more conventional soft sail rigs. This study was undertaken in order to assess which parameters influence wingsail performance of C-Class catamarans, and to what extent, the results from the wind tunnel can be applied in the design developments of future wingsails. A combined wing sail and C- class catamaran was tested in the low-speed section of the 7’ x 5’ wind tunnel at the University of Southampton. Testing assessed the appropriate settings for the movable element of the multiple-element wing sail as well as heeling angle,trampoline porosity, spanwise camber distribution and gap at the foot of the wingsail. Both upwind and downwind conditions were considered through measurement of driving force, heeling force, heeling and yawl moments. The results demonstrate that low heel angles improve overall performance and that the gap underneath the wingsail foot adversely affects the generation of lift by the sail. An airfoil shaped trampoline is suggested in order to benefit both a reduced gap and a better control over the heel. For heavy wind condition, negative twist at the tip of the wingsail allows higher boat speeds
wing sail, c class catamaran, wind tunnel tests
1740-0694
21-34
Magherini, M.
224ef443-6617-4bd9-aef6-18f14ce2d3d7
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Campbell, I.M.C.
e43a0bed-298f-4653-a0de-5b011b02b644
Magherini, M.
224ef443-6617-4bd9-aef6-18f14ce2d3d7
Turnock, S.R.
d6442f5c-d9af-4fdb-8406-7c79a92b26ce
Campbell, I.M.C.
e43a0bed-298f-4653-a0de-5b011b02b644

Magherini, M., Turnock, S.R. and Campbell, I.M.C. (2014) Parameters affecting the performance of the c-class wingsail. International Journal of Small Craft Technology, 156 (B1), 21-34. (doi:10.3940/rina.ijsct.2014.b1.155). (In Press)

Record type: Article

Abstract

Wing sails offer a different design challenge to those of more conventional soft sail rigs. This study was undertaken in order to assess which parameters influence wingsail performance of C-Class catamarans, and to what extent, the results from the wind tunnel can be applied in the design developments of future wingsails. A combined wing sail and C- class catamaran was tested in the low-speed section of the 7’ x 5’ wind tunnel at the University of Southampton. Testing assessed the appropriate settings for the movable element of the multiple-element wing sail as well as heeling angle,trampoline porosity, spanwise camber distribution and gap at the foot of the wingsail. Both upwind and downwind conditions were considered through measurement of driving force, heeling force, heeling and yawl moments. The results demonstrate that low heel angles improve overall performance and that the gap underneath the wingsail foot adversely affects the generation of lift by the sail. An airfoil shaped trampoline is suggested in order to benefit both a reduced gap and a better control over the heel. For heavy wind condition, negative twist at the tip of the wingsail allows higher boat speeds

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Paper IJSCT- Parameters affecting the performance of C-Class wingsail_FINAL VERSION v3.pdf - Author's Original
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More information

Accepted/In Press date: 2014
Keywords: wing sail, c class catamaran, wind tunnel tests
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 365259
URI: http://eprints.soton.ac.uk/id/eprint/365259
ISSN: 1740-0694
PURE UUID: 4b212787-0d90-420b-ac74-5ae754b9bb2d
ORCID for S.R. Turnock: ORCID iD orcid.org/0000-0001-6288-0400

Catalogue record

Date deposited: 30 May 2014 08:03
Last modified: 08 Jan 2022 02:34

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Contributors

Author: M. Magherini
Author: S.R. Turnock ORCID iD
Author: I.M.C. Campbell

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