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Keywords: hull
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Proceedings Papers

Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-011
... of relatively simple assumptions and theories. NOTATION AoA CFD DSYHS TWA TWS VMG VPP Vs 1+k Elevator E levatorI mmersion F lat H eel Long crew Lat crew Lif tF raction M xCtrl Rake Angle of Attack Computational Fluid Dynamics Delft Systematic Yacht Hull Series True Wind Angle True Wind Speed (m/s) Velocity...
Proceedings Papers

Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-001
... for analysis on the impact of Rudder Rake Differential (RRD) on overall performance, and predicting the optimal wind range for use of the light and heavy weather dagger boards on the AC50 Catamaran. The AC75 SVPP and DVPP were used to analyse the affect of hull shape and the main foils fixed angle-of-attack...
Proceedings Papers

Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-004
..., parallel to the bending axis Backset The curvature of a plate on the hull measured from a straight line across the two edges to the middle of the plate and can be in the transverse direction and/or longitudinal direction. A double backset plate is curved both ways; a compound curved surface. Bevel...
Proceedings Papers

Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-010
... for yacht designers and analysts. New methods are discussed to calculate the foil forces within the VPP solution loop for fully- or partly-immersed foils. A variety of non-trivial hydrodynamic issues are addressed, including dynamic hull forces and moments when wetted. A practical approach to surface...
Proceedings Papers

Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-001
... Hydrodynamics of Three Slender Models Resembling Polynesian Canoe Hulls Richard G.J. Flay, University of Auckland, Auckland, New Zealand Ignazio Maria Viola, Institute for Energy Systems, University of Edinburgh, United Kingdom Geoffrey J. Irwin, University of Auckland, Auckland, New Zealand...
Proceedings Papers

Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-006
... was investigated by performing experimental test in rough waves on a segmented containership s hull in the 50m×30m×5m hydrodynamic and ocean engineering tank of Ecole Centrale de Nantes. In this context, the main objective of this paper is to evaluate through simplified modelling whether basic structural...
Proceedings Papers

Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-013
... Conventional transom-hung rudders are often used on small sailboats because of their simplicity compared to rudders mounted under the hull; however, they present substantial performance penalties, including (1) the rudder is more likely to ventilate by drawing air down from the free surface, (2...
Proceedings Papers

Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-014
... by the Frenchman Andre Cornu as a double-handed mono-hull planing dinghy. The name comes from the overall length of the boat in centimeters (470cm). The 470 is a World Sailing International Class has been an Olympic class since the 1976 games. In Japan, the 470 is used in university championships and in National...
Proceedings Papers

Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-010
... the variation of their shape under wind flow; and a hydrodynamic one, handling the motion of the hull with its appendages in water. Regarding the first part, sails provide the aerodynamic force necessary for propulsion. But being very thin, they have their shape adapted according to the locally developing...
Proceedings Papers

Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-011
... Modern racing yacht semi-planing hull forms provide a number of complex challenges for designers and a minefield for those involved in yacht rating. The SYRF Wide Light Project was initiated as a means of providing data with which to assess a range of alternative computation methodologies...
Proceedings Papers

Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-013
... calculation interfoammod 0 stability limitation oursolver free surface yacht iteration face value star-ccm 0 volume fraction reconstruction reservoir simulation hull star-ccm solver interface timestep gradient equation While plain vanilla OpenFOAM has strong capabilities...
Proceedings Papers

Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-002
... upstream oil & gas measured data coefficient sensor hull distortion vpp simulation contour boat speed correction shape stripe standard deviation awa stripe anemometer ran rudder angle boat This paper compares performance predictions from a Reynolds Averaged Navier...
Proceedings Papers

Paper presented at the SNAME 21st Chesapeake Sailing Yacht Symposium, March 15–16, 2013
Paper Number: SNAME-CSYS-2013-001
... of sailing yachts require careful g evaluation of raw tank data and extrapolation to the full Reynolds number for hull scale performance in comparison with commercial ship RT tank testing. Froude scaling has been widely utilized for the RF Reynolds number for keel, bulb and extrapolation of model results...
Proceedings Papers

Paper presented at the SNAME 21st Chesapeake Sailing Yacht Symposium, March 15–16, 2013
Paper Number: SNAME-CSYS-2013-009
... an ambitious agenda of analytical and experimental investigations to support design, including a parametric study of hull form as it relates to stability at high angles of heel, the development of bespoke parametric design and analysis tools using the graphical algorithm editor Grasshopper, a towing tank...
Proceedings Papers

Paper presented at the SNAME 21st Chesapeake Sailing Yacht Symposium, March 15–16, 2013
Paper Number: SNAME-CSYS-2013-003
... Measurements of the inertia parameters of a keelboat hull using a bifilar suspension are described. Bifilar yaw moment measurement normally entails accurate measurement of the length l and spacing 2 d of the suspension, and of T y the period of pure yaw oscillation 1 . The primary...
Proceedings Papers

Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-006
... surface submergence interaction froude number residuary resistance hull coefficient heave post heel resistance bulb position diameter wave pattern resistance cylinder bulb submergence appendage chesapeake sailing yacht symposium THE 20th CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS...
Proceedings Papers

Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-012
... to a round bilged sailing yacht, the Open 60 Imagine—an older Open 60 hull-form by Kaufmann Designs. The effect of transom lift devices was tested on the one-tenth scale model of Imagine in the Robinson Model Basin at Webb Institute. Heel angles of 0, 5, and 10 degrees were investigated at a range of speeds...
Proceedings Papers

Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-011
... with the foil aligned more quickly. Most inshore and dinghy racing done is on to the center plane, in a gybing configuration at a series of windward-leeward courses where the boats must spend a angles relative to the hull, and in configurations combining large amount of the time sailing directly into the wind...
Proceedings Papers

Paper presented at the SNAME 19th Chesapeake Sailing Yacht Symposium, March 20–21, 2009
Paper Number: SNAME-CSYS-2009-014
... and more circular hull International C-Class Catamaran Championship and was cross section. The second was Rocker, the bold hydrofoil victorious in capturing the trophy with five straight wins by catamaran, using hulls from the same mold as Alpha and an Alpha CAN 6 over the venerable Cogito from the USA...
Proceedings Papers

Paper presented at the SNAME 19th Chesapeake Sailing Yacht Symposium, March 20–21, 2009
Paper Number: SNAME-CSYS-2009-004
... code to represent flow dynamics for every speed with a special attention to high speeds. The practical question raised is to know which kind of answers each code can bring in terms of tendencies evaluation or sensitivity to hull geometry modifications. The main goal is to be able to judge if those...

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