MEASUREMENT

Basic Boat Measurements

* Including Rotating Masts and Boom, when applicable.

The SCHRS Boat Measurement

Beam Measurements

  • Beam - Width of the beam *

* The maximum width of the boat, including wings, racks, sliding seats or other appendages.

The SCHRS Beam Measurement

Board Measurements

  • Standard daggerboard where LB = board depth below hulls (a)

  • T Foil daggerboard where LB = addition of both lengths (b + c)

  • Curved daggerboard where LB = measured around external circumference (d)
The SCHRS Board Measurement

Main Sail Measurements

CM - Area of Main Sail + Mast + Boom

  • S1a = ((h + h1)(a - a1) + (a1 x h))/2
  • S2 = c x h2/2
  • S3 = 2/3 c3 x h3
  • S4 = c4 x h4/2
  • S5 = 2/3 c5 x h5
  • S6 = 2/3 c6 x h6
  • S7 = 2/3 a x h7
  • S8 = 2/3 b x h8
  • CM* = (S1+S2+S3+S4+S5+S6+S7+S8)m²
  • Area of Mastb = (Total Length x Perimeter / 2)m²
  • Area of Boomc = (Total Length x Height)m²
  • CM = (CM* + Area of Mast + Area of Boom)m²

* intermediate calculation if other conditions apply
a h1 and h should be parallel
b only applies to rotating masts
c does not apply to boomless sails or if height is greater than 1.5 of breath

The SCHRS Main Sail Measurement

Length of Top of Mainsail Measurement

The SCHRS Top of Main Sail Measurement  The SCHRS Top of Main Sail Measurement  The SCHRS Top of Main Sail Measurement 


Jib Measurements

CJ - Area of Jib

  • S9 = a + h14 x h / 2
  • S10 = 2/3 b x h10
  • S11 = 2/3 c x h11
  • S12 = 2/3 a x h12
  • S13 = h14 x d/2
  • CJ = ( S9 +or- S10 +or- S11 +or- S12 - S13) m²
The SCHRS Jib Measurement


Spinnaker Measurements

CSPI - Area of Spinnaker

  • CSPI = SFx(SL1+SL2)/4+(SMG*-SF/2)x2/3(SL1+SL2)/2 m²

* where SMG >= 75% of SF

The SCHRS Spinnaker Measurement