PERFORMANCE PREDICTION
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1 PERFORMANCE PREDICTION First 40 Carbon Pack With Deep Fin Keel/ Carbon mast/ Asymmetric Spinnaker on Retractable Sprit For Chantiers Beneteau Farr Yacht Design, Ltd. Copyright July 22, 2014 PO Box 4964, Annapolis, MD USA Tel: , Fax:
2 DESCRIPTION OF SYMBOLS IN VPP OUTPUT The accompanying document contains a large amount information about the predicted performance of your boat. To allow this document to be used as a valuable racing tool we have prepared the following explanation of the important terms it contains. General Terms: Vt or TWS Bt or TWA V or Vs VMG HEEL REEF FLAT Va, AWS Ba, AWA Lee Sail Flot True Wind Speed True Wind Angle Boat Speed Boat Velocity Made Good Heel Angle Measure of Reduction in Sail Area Measure of Reduction in Sail Lift Apparent Wind Speed Apparent Wind Angle Leeway Angle Sail Combination Designator (Upwind or Downwind) Flotation Designator (Varies Only For Water Ballasted Boats) VPP Polar Diagram This is a graphical representation of the boats performance across a range of windspeeds and true wind directions. Optimal upwind and downwind conditions are marked as small rectangles on the boat speed contours for each windspeed. Best Boatspeeds The upper portion of this page gives a numerical representation of the polar diagram. Boatspeeds in knots are given for a series of true windspeeds at masthead height, across a range of true wind angles. All boatspeeds and windspeeds are given in knots. The shaded cells lie beyond the upwind and downwind optimum points. The two tables on the lower portion of the page provide a ready reference of useful details about the optimum upwind and downwind sailing conditions as a function of the true windspeeds (Vt s) across the top of the page. In addition to indicating the optimum upwind and downwind boat speeds in knots, they are also expressed in seconds/mile and in seconds/boat length. VMG is also expressed in seconds/mile. Best Performance This page is a detailed representation of the polar diagram showing a list of predicted performance variables for each windspeed over the range of true wind angles. All of those items listed in the General Terms section are listed and optimum upwind and downwind settings are included in bold type. FARR YACHT DESIGN LTD 613 THIRD STREET SUITE 20 ANNAPOLIS MD U.S.A. T F info@farrdesign.com Page 1 G:\Standards\VPP\VPPexplanation GEN.doc Created on December 31, 2012, Last Saved December 31, 2012
3 First 40 CARBON - carbon mast / Fin Keel / Aym on Sprit for Chantiers Beneteau p. 1 07/22/14 15:19:26
4 Best Boatspeeds (kt) Up.Vs(kts) Up.Vs(s/m) Up.Vs(s/L) Up.Bt Up.Vmg(kts) Up.Vmg(s/m) Up.Heel Up.Reef Up.Flat Up.Twist Up.Va Up.Ba Up.Leewy Dn.Vs(kts) Dn.Vs(s/m) Dn.Vs(s/L) Dn.Bt Dn.Vmg(kts) Dn.Vmg(s/m) Dn.Heel Dn.Reef Dn.Flat Dn.Twist Dn.Va Dn.Ba Dn.Leewy p. 2 07/22/14 15:19:26
5 Best Performance Up Up Up Up Up Up OptUp > Up Up Up Up Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Dn Dn Up Up Up Up Up OptUp > Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Dn p. 3 07/22/14 15:19:26
6 Up Up Up Up Up OptUp > Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Dn Up Up Up Up OptUp > Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn p. 4 07/22/14 15:19:27
7 Up Up Up Up OptUp > Up Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Up Up Up OptUp > Up Up Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn p. 5 07/22/14 15:19:27
8 Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn p. 6 07/22/14 15:19:27
9 Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Up Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Dn p. 7 07/22/14 15:19:27
10 Up Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn OptDn > Dn Dn Dn Dn Dn Up Up Up Up Up OptUp > Up Up Up Up Up Up Up Up Up Up Dn Dn Dn Dn OptDn > Dn Dn Dn Dn p. 8 07/22/14 15:19:27
11 p. 9 07/22/14 15:19:27
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