... of a bi-dimensional section of a spinnaker, will also be presented here for the first time. These results allow to interpret some inconsistent data from past experiments and simulations, and to provide guidance for future model testing and sail design. NOTATION AoA Angle of Attack CFD Computational Fluid...

... performance, sail performance, steady sailing performance and maneuvering performance. calculation high-speed sailing kanazawa institute jib variation sailing resistance wind speed wetted area solidfromphoto coefficient rudder twa center board thrust spinnaker heel angle olympic games...

... While sailing offwind, the trimmer typically adjusts the downwind sail "on the verge of luffing", letting occasionally the luff of the sail flapping. Due to the unsteadiness of the spinnaker itself, maintaining the luff on the verge of luffing needs continual adjustments. The propulsive force...

... at 20° starboard tack is to tack just before their paths would cross apparent wind angle, downwind under asymmetric and position itself in the lee-bow position (L) depicted in spinnaker at 60° and downwind under symmetric spinnaker figure 1. In this position it can find positive interference...

... In this paper the results of wind tunnel tests on two different asymmetric spinnakers are presented. During these tests forces and flying shapes at different apparent wind angles and trims were recorded by 6DoF balance and photogrammetry. As these tests are intended as a validation benchmark...

... condition was modelled using a Vortex Lattice code, while the downwind wind-tunnel test was modelled using a Navier-Stokes code. The pressures obtained from the three different methods are compared on three horizontal sections of the headsail, mainsail, and asymmetric spinnaker. In general the pressures...

... This paper describes model and full scale measurements of the flying shape of spinnakers that have been developed for a 38’ c/r yacht. The flying shape measurement principle was based on photogrammetry. Motivation behind this study was to investigate and compare the flying shape as obtained...

... This paper describes a method for the acquisition of the flying shape of spinnakers in a twisted flow wind tunnel. The method is based on photogrammetry. A set of digital cameras is used to obtain high resolution images of the spinnaker from different viewing angles. The images are post...

... reservoir simulation single rudder constraint spinnaker rudder investigation ac90 yacht froude number variant 3 appendage configuration ruder twin rudder yacht prediction boat speed consequence rudder configuration wind speed This paper describes some CFD and VPP...

... with a finite of main sail element analysis of her rig. DLf drag and lift on foot perpendicular to plane of NOTATION main sail AWA apparent wind angle Forces spinnaker: AWA apparent wind speed Lsp lift spinnaker FEA finite element analysis Dsp drag spinnaker CFD computer fluid dynamics Ltsp lift tack spinnaker...

... apparent wind angle spinnaker wind engineering objective camber limitation reynolds number side force downwind sail parametric variation force coefficient thrust coefficient coefficient aspect ratio drag coefficient wind tunnel aerodynamic dynamometer THE 16th CHESAPEAKE...

.... Specifically, it has been concluded that large spinnakers are penalized so that a fractional rig, with its small spinnaker, is favored when sailing offwind, that there are un-rated benefits to a masthead rig upwind, and that there are errors in the relative handicapping of overlapping and non-overlapping jibs...

... program calculates the deformed sail geometry assembled, they take the shape of a spinnaker. Membrain from the resulting aerodynamic pressure acting on the does not accept 3-D paneled surface description, thus a sails. MemBrain utilizes a user defined surface mesh, where the user has the ability...

... resistance spinnaker velocity prediction program boat speed pcsail dimension maximum boat speed drag coefficient university An Excel Velocity Prediction Program has been developed to allow for rapid evaluation of yacht performance at the initial design stage. The required input...

... The primary purpose of this offwind sail investigation was to better understand the relative performance of symmetric spinnakers flown from conventional poles and asymmetric spinnakers flown from conventional poles or sprits, i.e. poles restricted to the centerline. The specific goal...