Class Rules:

Performance Parameters

Multihull & Monohull

 

Standards to insure competition between boats of identical design in the essential areas such as hull lines, weights, and sail plan are applied to Ratings. 

 

 

 

 

Sail

Main

Jib

Platform

Sailing

Crew

Crew.Min

Crew.Max

Hiking

 

 

Length

Area

Vertical.Luff

Vertical.Luff

Weight

Weight

Wt./#

Weight

Weight

Trapeze

America's Cup (AC45, AC72)

Link

+

+

+

+

+

+

+

+

+

+

F18

Link

+

+

+

+

+

+

+

+

+

+

Texel Netherlands ≤ 20 ft.

Link

+

+

+

+

 

+

+

+

 

+

Texel Netherlands > 20 ft.

Link

+

+

+

+

 

+

+

+

 

 

Texel Australia (OMR) > 22ft.

Link

+

+

+

+

 

+

+

+

 

 

Texel Thailand (OMR) > 22ft.

Link

+

+

+

+

 

+

+

+

 

 

Multi2000 (France) > 22ft

Link

+

+

+

+

 

+

+

 

 

 

SCHRS ≤ 20 ft.

Link

+

+

+

+

 

+

#

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

Antrim 27

Link

+

+

+

+

 

+

2

 

1100 lb

 

J-120

Link

+

+

+

+

 

+

 

 

600 kg

 

Melges 24

Link

+

+

+

+

+

 

3

 

360 kg

 

J-105

Link

+

+

+

+

+

 

 

 

1045 lb

 

Express 27

Link

+

+

+

+

+

 

 

 

880 lb

 

 

 

 

 

 

 

 

 

 

 

 

 

# Texel

Crew Weight Assumption x LOA or Declaration

# SCHRS Crew Number

Crew Weight Assumption = 75kg / 165 lb each

 

Multihull Rating Formulas: General Form to assess Performance

 

100 / (coeff. * RL ^ p * RSA ^ q / RW ^ r).

 

RL

= Rated Length

RSA

= Rated Sail Area

RW

= Rated Weight

 

 

TR.NDL

= Texel Rating (Netherlands)

TR.AUS

= Texel Rating (Australia)

Multi2000

= Multi2000 Rule (France)

MOCRA

= Kelsall Shuttleworth Performance. (KSP, England)

IOMR

= International Offshore Multihull Rule (California)

 

TR.NDL.2009 (metr.)

catamarans ≤ 20ft

= 100 / (0.99 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3000)

TR.NDL.2009 (metr.)

multihulls ≥ 20 ft

= 100 / (0.99 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3000)

 

 

 

TR.NDL.2010 (metr.)

Catamarans ≤ 20 ft

= 100 / (1.15 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3000)

TR.NDL.2010 (metr.)

multihulls ≥ 20 ft

= 100 / (1.00 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3250)

 

 

 

TR.AUS.2010 (metr.)

multihulls ≥ 22 ft

= 100 / (1.00 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3250)

 

TR.THA.2010 (metr.)

multihulls ≥ 22 ft

= 100 / (1.00 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3250)

Multi2000 (FR)

 

= 100 / (1.00 * RL ^ 0.3000 * RSA ^ 0.4000 / RW ^ 0.3250)

 

MOCRA (UK) (metr.)

 

= 100 / (1.74 * RL ^ 0.2814 * RSA ^ 0.3546 / RW ^ 0.3124)

Portsmouth

 

ref 1 :Starts w/Pacific Multihull Assoc. Calculated rating from measurements (modified)

 

 

 

 

RL

Rated Length

NDL

Rated Length @ 2.0 % x LOA above LWL

AUS/THA

Rated Length @ 1.5 % x LOA above LWL

FRA

Rated Length @ 50% x FOC above LWL (FOC = Fwd Overhang)

 

 

MSA

Measured Sail Area

RSA

Rated Sail Area

 

 

2010.RSA.Scr.NDL

=IF(msascr=0,0,IF(smgscr/sfscr>0.75,0.07*(msascr-rsag),(0.80-smgscr/sfscr)*(msascr-rsag)))

2009.RSA.Scr.NDL

=IF(msascr=0,0,IF(smgscr/sfscr>0.75,0.07*(msascr-rsag),(0.82-smgscr/sfscr)*(msascr-rsag)))

 

 

2010.RSA.NDL

=rsam+rsag+rsas+IF(rsas>0,0.16*msascr,rsascr)

2009.RSA.NDL

=rsam+rsag+rsas+rsascr

 

 

2010.CatCorrect.NDL

IF(tri=1,1,MAX(1,1/(0.19*rsa^0.4/rw^0.36+0.91)))

 

 

2010.RSA.AUS

No.Screacher & no.Spin

 

RSA=RSA.main+RSA.genoa

 

 

 

Screacher & no.Spin

 

RSA=rsa.Main+(0.65*rsa.Genoa)+z.85*(0.35*MSA.Screacher)

 

 

 

No.Screacher & Spin

 

RSA=rsa.Main+(0.70*rsa.Genoa)+z.85*(0.30*MSA.Spinnaker)

 

 

 

Screacher & Spin

 

RSA=rsa.Main+(0.65*rsa.Genoa)

 

+z.85*((0.30*MSA.Spinnaker)+(0.50*(MSA.Screacher))

 

Ref: Texel.NDL.Link , ISAF SCHRS.Link, Texel.AUS.Link, Multi2000.English Link, Portsmouth US Sailing Offshore.Link