Paper Title: Parameters Affecting the Performance of the C-Class Wingsail
M Magherini and S R Turnock, Ship Science, University of Southampton, UK,
I M Cambell, Wolfson Unit Marine Technology and Industrial Aerodynamics, University of Southampton. UK
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.
Transactions RINA, Vol 156, Part B1, International Journal of Small Craft Technology, Jan-Jun 2014
DOI No: 10.3940/rina.ijsct.2014.b1.155
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