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Keywords: boat speed
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Proceedings Papers
Weather Based Scoring
Available to Purchase
Paper presented at the SNAME 25th Chesapeake Sailing Yacht Symposium, March 14–15, 2025
Paper Number: SNAME-CSYS-2025-009
... The last few decades have seen the emergence and refinement of technical approaches to predicting the performance of racing sailboats. The modern velocity prediction program (VPP) has proven to have a high degree of accuracy in comparing the boat speed potentials of a wide variety of designs...
Proceedings Papers
Development of a Six Degree of Freedom Velocity Prediction Program for the Foiling America's Cup Vessels
Available to Purchase
Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-001
... to the predictions from XFLR5. race data ac75 weather daggerboard yacht dvpp hull hull shape xflr5 chord length coefficient boat speed svpp daggerboard twa good correlation velocity prediction program america foil THE 24TH CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, JUNE 2022...
Proceedings Papers
Velocity Prediction Program for a Hydrofoiling Lake Racer
Available to Purchase
Paper presented at the SNAME 24th Chesapeake Sailing Yacht Symposium, June 10–11, 2022
Paper Number: SNAME-CSYS-2022-011
... hydrofoil yacht hull sailing mode coefficient boat speed vpp heel angle configuration vpp model trim parameter THE 24T H CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, JUNE 2022 Velocity Prediction Program for a Hydrofoiling Lake Racer Michele Francesco Melis, Hamburg University...
Proceedings Papers
6DOF behavior of an offshore racing trimaran in an unsteady environment
Available to Purchase
Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-008
... design conference annapolis maneuver sailing yacht coefficient numerical tool response amplitude operator boat speed reservoir simulation evolution THE 23RD CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2019 6DOF behavior of an offshore racing trimaran in an unsteady...
Proceedings Papers
Scoring Methods for Handicap Racing
Available to Purchase
Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-012
... Two boats sailing in close proximity may inevitably compare their boat speeds, perhaps even "race" each other. Over the last few centuries there have been numerous handicap systems designed to equalize the competitive chances of racing sailboats. Corollary to handicapping is another arcane art...
Proceedings Papers
The Un-restrained Sailing Yacht Model Tests – A New Approach and Technology Appropriate to Modern Sailing Yacht Seakeeping
Available to Purchase
Paper presented at the SNAME 23rd Chesapeake Sailing Yacht Symposium, March 15–16, 2019
Paper Number: SNAME-CSYS-2019-003
... and performance evaluation process for sailing yachts. foil heave head sea aerodynamic force characteristic mast boat speed model test resistance proceedings simulation variation sailing yacht symposium calm water configuration gerritsma wolfson unit wave height THE 23RD CHESAPEAKE...
Proceedings Papers
Prediction and Optimization of Aerodynamic Forces and Boat Speed of Foiling Catamaran with a Rig of a Rigid Wing and a Jib
Available to Purchase
Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-001
... methods are combined in a velocity prediction program featuring a constraint optimization method in order to predict boat speed and wing and foil trimming parameters for its maximization. A velocity polar calculated by applying this method to a 50-foot catamaran is shown and the result of some studies...
Proceedings Papers
A Comparison of a RANS Based VPP to on the Water Sailing Performance
Available to Purchase
Paper presented at the SNAME 22nd Chesapeake Sailing Yacht Symposium, March 18–19, 2016
Paper Number: SNAME-CSYS-2016-002
... force model, a hydrodynamic force model and an algorithm to balance the forces. The force balance routine uses four degrees of freedom; boat speed, yaw, heel and rudder angle to balance the aerodynamic and hydrodynamic forces for a given true wind speed and angle. The force models are derived from RANS...
Proceedings Papers
A Measurement System for Performance Monitoring on Small Sailing Dinghies
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Paper presented at the SNAME 21st Chesapeake Sailing Yacht Symposium, March 15–16, 2013
Paper Number: SNAME-CSYS-2013-011
... set of nautical instruments (wind, boat speed and heading, position) as well as dynamic sensors measuring the motion of the dinghy with additional audio and video streams for crew observations. Most sensors are integrated in a small lightweight housing also containing a main processing unit...
Proceedings Papers
A New Real-time Method for Sailboat Performance Estimation Based on Leeway Modeling
Available to Purchase
Paper presented at the SNAME 21st Chesapeake Sailing Yacht Symposium, March 15–16, 2013
Paper Number: SNAME-CSYS-2013-004
... approach and shows that a solution, based on UKF filters, provides a relevant method to cope with accuracy and stability in case of sensor data outage. boat motion empirical formula compute displacement formula wind measurement boat speed computation vector dvl outage sensor estimation...
Proceedings Papers
Effective Wind Tunnel Testing of Yacht Sails Using a Real-Time Velocity Prediction Program
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Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-008
... picture of aerodynamic performance over a full range of conditions in a rapid and cost-effective manner. The use of a Real-Time VPP and a sail shape recognition system combine to enhance the accuracy and repeatability of testing. The influence of examining boat speed instead of driving force...
Proceedings Papers
Sizing and Analysis of Folding Propellers for Auxiliary-Powered Sailboats
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Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-014
.... Topics considered in this paper include speed prediction, calculation models for folding propellers, and cavitation criteria. formula criteria calculation efficiency resistance prediction blade pressure tip speed folding propeller prediction coefficient boat speed evaluation cavitation...
Proceedings Papers
RVPP: Sailing Yacht Performance Prediction fully integrated into a RANSE based flow code
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Paper presented at the SNAME 20th Chesapeake Sailing Yacht Symposium, March 18–19, 2011
Paper Number: SNAME-CSYS-2011-007
... One of the most important tools in today’s sailing yacht design is the Velocity Prediction Program (VPP). VPPs calculate boat speed from the equilibrium of aero and hydrodynamic flow forces. Consequently their accuracy is linked to the accuracy of the aero- and hydrodynamic data used...
Proceedings Papers
CFD- and VPP-Challenges in the Design of the New AC90 Americas Cup Yacht
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Paper presented at the SNAME 19th Chesapeake Sailing Yacht Symposium, March 20–21, 2009
Paper Number: SNAME-CSYS-2009-001
...-like performance of the yacht in a VPP is investigated. reservoir simulation single rudder constraint froude number ruder spinnaker twin rudder variant 3 yacht rudder prediction appendage boat speed investigation rudder configuration configuration consequence ac90 yacht wind...
Proceedings Papers
Performance Prediction without Empiricism: A RANS-Based VPP and Design Optimization Capability
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Paper presented at the SNAME 18th Chesapeake Sailing Yacht Symposium, March 2–3, 2007
Paper Number: SNAME-CSYS-2007-006
... simulation) True Wind Angle True Wind Speed Boat speed Velocity Made Good INTRODUCTION Performance-driven design requires that speed (not drag or some other design parameter) be used as a measure-of-merit. One of the most important tools in a designer s arsenal is therefore the Velocity-Prediction Program...
Proceedings Papers
A New Velocity Prediction Method for Post-Processing of Towing Tank Test Results
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Paper presented at the SNAME 17th Chesapeake Sailing Yacht Symposium, March 4–5, 2005
Paper Number: SNAME-CSYS-2005-005
... examples are shown: a study of the impact of the ACC V4/V5 rule changes and a comparison of a canting keel and a conventional keel yacht. artificial intelligence modeling & simulation test run resistance efficiency yacht estimate function coefficient boat speed investigation...
Proceedings Papers
Sailing Yacht Design for Maximum Speed
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Paper presented at the SNAME 16th Chesapeake Sailing Yacht Symposium, March 3, 2003
Paper Number: SNAME-CSYS-2003-008
... speed prediction algorithm yacht mph wind boat speed land yacht wood duck mast configuration fuselage iceboat greater difficulty sailing iron duck square foot wing light wind wind speed THE 16th CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2003 Sailing Yacht Design...
Proceedings Papers
PCSAIL, A Velocity Prediction Program for a Home Computer
Available to Purchase
Paper presented at the SNAME 15th Chesapeake Sailing Yacht Symposium, January 26, 2001
Paper Number: SNAME-CSYS-2001-010
..., PCSAIL, may be made with equations and other information provided in the Appendix. The Excel "Solver" has been found to be a reliable means of finding the equilibrium boat speed and heel angle. It seeks the maximum boat speed by adjusting the sail flattening factor, F, and reef, R, and the lateral...
Proceedings Papers
Full Scale Measurement of Sail Force and the Validation of Numerical Calculation Method
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Paper presented at the SNAME 13th Chesapeake Sailing Yacht Symposium, January 24–25, 1997
Paper Number: SNAME-CSYS-1997-002
..., such as the boat speed, heel angle, wind speed, wind angle, and so on, were also measured. Sail shapes of the boat in the up-wind condition were also measured with the use of CCD cameras installed in the boat. The sail shape images taken by the cameras were transformed to bit-map files, and then processed...
Proceedings Papers
Refinements in the Techniques of Tank Testing Sailing Yachts and the Processing of Test Data
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Paper presented at the SNAME 11th Chesapeake Sailing Yacht Symposium, January 28–30, 1993
Paper Number: SNAME-CSYS-1993-007
.... model testing sname-csys-1993-007 pact davidson boat speed test program designer partnership america tank new york - THE ELEVENTH CHESAPEAKE SAILING YACHT SYMPOSIUM Refinements in the Techniques of Tank Testing Sailing Yachts and the Processing of Test Data James R. Teeters, Sparkman...
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