Sailing Performance of Ocean Cruising Yacht by Full-Scale Sea Test

Masuyama, Yutaka; Nakamura, Ichiro; Tatano, Hisayoshi; Takagi, Ken; Miyakawa, Takashi

doi:10.2534/jjasnaoe1968.1992.172_349

Cited by 2 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the widely used steady state models of the IMS VPP (Claughton, 1999), the four degrees of freedom program of Larsson (1990) included a first account of wave effects by computing added resistance through strip theory. Masuyama et al (1993Masuyama et al ( , 1995 developed a numerical tool based on hydrodynamic derivatives computed from tank tests and aerodynamic coefficients derived from wind tunnel measurements. Comparison of their 4 degrees of freedom results with full-scale measurements proved successful.…”

Section: Sailing Yacht Dynamic Simulationmentioning

confidence: 99%

Development of a 6-DOF Dynamic Velocity Prediction Program for offshore racing yachts

et al. 2020

View full text Add to dashboard Cite

Thanks to high lift-to-drag ratios, hydrofoils are of great interest for high-speed vessels. Modern sailing yachts fitted with foils have thus reached impressively high speeds on the water. But this hydrodynamic efficiency is achieved at the expense of stability. Accurate tradeoffs are therefore needed to ensure both performance and safety. While usual Velocity Prediction Programs (VPPs) are inadequate to assess dynamic stability, the varying nature of the offshore racing environment further complicates the task.Dynamic simulation in the time-domain is thus necessary to help architects assess their designs. This paper presents a system-based numerical tool which aims at predicting the dynamic behavior of offshore sailing yachts. A 6 degrees of freedom (DOF) algorithm is used, calculating loads as a superposition of several components (hull, appendage, sails). Part of them are computed at runtime while the others use pre-computed dataset, allowing a good compromise between efficiency and flexibility.Three 6DOF simulations of an existing offshore trimaran (a maneuver, unsteady wind conditions and quartering seas) are presented. They underline the interest of dynamic studies, demonstrating how important the yacht state history is to the understanding of her instantaneous behavior and showing that dynamic simulations open a different field of optimization than VPPs.

show abstract

Section: Sailing Yacht Dynamic Simulationmentioning

confidence: 99%