Trans RINA, Vol 153, Part B2, Intl J Small Craft Tech, 2011 Jul-Dec
Table 13: Reactions applied on the vessel. Dock tuning (t)
Backstay chainplate Forestay chainplate Shrouds chainplate Mast collar Mast step
0.98 2.43 3.62 0.20 10.6
Mainsheet - Foresheet -
6.
Sailing (t) 0.20 ↓ 3.33 ↑ 5.87 ↑ 0.73 ↑ 12.4 ↑ 0.95 0.81
CONCLUSIONS
The development of a fully integrated sail-rig analysis has been presented. The emphasis is placed on providing a practical application for rig design, which will allow further improvements over
earlier methods.
development of the integrated sail-rig analysis and design system has met the objectives within statement, more specifically:
the mission
The algorithms for the various design and analysis phases have been developed to produce an efficient, flexible and user friendly analysis method, which can be used on a personal computer.
The analytic method constitutes an enhancement to the current rig and sail design approach.
The use of this system allows evaluating alternative solutions in an effective and versatile way, by exploring rig
design concepts
performance in various conditions.
and assessing sailing and tuning
Considering the overall practicality of the system the results are promising. This case study has shown the following important results:
The utmost need for a versatile and integrated sail- rig design tool that allows a first evaluation of the optimal rig dimensions and material properties.
The importance of a quick evaluation of mast bend, luff sag for optimal design.
sail plan design and yacht
Further developments will concentrate on adding the aerodynamic influence of the rig on the sails and non stationary effects. Current diversifications include:
The development of a complete input customised for the Velocity Prediction Program (VPP) for use in the performance prediction for the entire sailboat.
Figure 7: Flying rig shape (deformation magnified by a factor of 4).
As Tables 12 and 13 show, when sailing loads are applied deformation and loads transferred on the hull vary sensibly (in this case, they all increase, apart from the backstay load which decreases). Different results could be achieved by varying the mast tube thickness, the rigging diameters, the material properties and the tuning settings. However, the purpose of this case study is not to exhaust the debate about optimal mast design or to provide standard dimension for an optimal mast and rig model, but to enlighten the need for accurate evaluation of the sails loads when performance is the key.
The development of a method to carry out the structural analysis of the sail and rig under the pressure loads resulting from typical RANS analysis method.
7. ACKNOWLEDGEMENTS
Special thanks to the SMAR Azure technical team: Dr. Donald W. Mac Vicar and Mr. Stephen Jordan for their continuous
and
8. 1.
REFERENCES
MALPEDE, S., NASATO, F., ‘A Fully Integrated
Proceeding of the 2nd International Conference on Innovation in High Performance Sailing Yachts, Lorient, 30 June - 1 July 2010, 203-210.
Sail-Rig Analysis Method’, B-124 ©2011: The Royal Institution of Naval Architects proactive contribution to the
development of the method and graphics presented in this paper.
The
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