DIY Custom Evaluation

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(ft) (ft) (ft2) (ft)

If beam centerline and/or hull beam are left blank, their values will be estimated.

(ft) (ft)

Bridgedeck clearance is used only for catamarans.

(in)

Specifications

 
Hull type ?Catamaran or Trimaran -
Loa ?Length overall - measurement bow to stern -
Lwl ?Length at waterline - measurement of length of hull at designed waterline -
Boa ?Beam overall - measurement at the widest location of hulls -
Bcl ?Beam centerline - measurement between the Centerline of catamaran hulls; or in trimarans the measurement between Centerline of the Amas of trimaran, outside hulls Further readings in Abbreviations, Definitions, Formulas and Terms - Technical Section -
Bh ?Beam hull = measurement of hull width at waterline Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
Disp ?Displacement = Designer's target weight for a boat at waterline. Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
SA ?Sail Area = Total sail area of the Main and Jib - 100% fore-triangle area only. Further info in Abbreviations Definitions, Formulas and Terms - Technical Section -
Bcl/Lwl ?Beam Centerline/Length Waterline = Beam centerlines (Bcl) to the waterline length (LWL). Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
Lwl/Bh ?Lwl/Bh = Waterline length (Lwl)/Beam hul (Bh). Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
BdCl ?Bridgedeck Clearance = Bridgedeck Clearance distance from water to lowest section of the boat. Further info in Bridgedeck Clearance Revised 1/07 - Technical Section -
BdCl v. Nom ?Bridgedeck Clearance vs. Nominal Clearance (Nom). Further info in Bridgedeck Clearance Revised 1/07 - Technical Section -

Performance Indicators

 
SA/D ?Sail Area/Displacement = is a measure of relative power potential for comparing two or more boats. Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
BN ?Bruce Number = is a measure of relative power potential for comparing two or more boats: Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
BSpd ?Base Speed = An empirically-derived indicator of speed potential, a formula equation developed by Richard Boehmer: Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -
KSP ?Derek Kelsall Speed Prediction = a measure of predicted speed of a multihull by Derek Kelsall. Further info in Abbreviations, Definitions, Formulas and Terms in Technical Section. -
Texel ?Texel Rating formula gives a measurement of speed over a given distance rendered in Time by Seconds, The lower the number the faster the boat, It is a Multihull Handicap Rating system. Further info in Texel Rating - Technical Section -

Stability Indicators

 
SSpd ?Stability Speed = This figure is an indicator of the wind speed at which the windward hull of a catamaran, or the main hull of a trimaran, will begin to lift. Further info in Technical Section. Also see John Shuttleworth's "Seaworthiness - basic concepts". -
KSI ?Derek Kelsall Stability Indicator – This figure is an indicator of the resistance of a boat to sideways capsize: Further info in Abbreviations, Definitions, Formulas and Terms - Technical Section -