Measurement Definitions

Measurements defined as follows will be taken in order to calculate a particular yacht’s rating:

Weight

  1. DSPW Total measured weight of a boat in measurement trim

  2. DSPWD Total declared (published) weight of a boat in measurement trim

Hull

  1. LOA Length Overall – Of longest hull, excluding rub rails, railings, anchor rollers etc.

  2. FO Forward Overhang – Horizontal distance from the forward-most part of the hull to where the stem, or a straight projection thereof, cuts the waterline.

  3. FF Forward freeboard – Vertical distance from the forward-most part of the hull to the waterline

  4. AO Aft Overhang – Horizontal distance from the aft-most part of the hull to where the stern, or a straight projection thereof, cuts the waterline.

  5. Y Aft freeboard – Vertical distance from the aft-most part of the hull to the waterline

  6. OSB Distance between the outermost stems of a trimaran or the stems of a catamaran

  7. TP Type , number of propellers - none, One folding, One fixed, Two Folding, Two fixed

  8. V Maximum draft to underside of hull or fixed keel if present

  9. TH Hull type – Catamaran, Trimaran

Daggerboards and Foils

  1. TB Board type – None, Standard, Asymmetric, C-Board, L or T-Board

  2. BV1, 2, 3, 4 Board /Foil 1, 2, 3, 4 maximum exposed vertical length

  3. BH1, 2, 3, 4 Board /Foil 1, 2, 3, 4 maximum exposed horizontal length

  4. BC1, 2, 3, 4 Board/Foil 1, 2, 3, 4 maximum cord

Mast

  1. TPC Mast control type – Fixed, Rotating, Canting or Both

  2. PC Circumference of rotating mast

  3. PCY Circumference of rotating mizzen mast


    Main Sail

    1. PU Vertical distance between the top of the mainsail hoist and the clew

    2. PL Vertical distance of mainsail clew above or below tack

    3. E Maximum outhaul distance perpendicular to mast

    4. MHB Top width

    5. MUW Upper width

    6. MTW Three-quarter width

    7. MHW Half width

    8. MQW Quarter width

    Mizzen, 2nd Main Sail

    1. PUY Mizzen hoist

    2. PLY Vertical distance of mizzen clew below or above tack

    3. EY Maximum outhaul distance perpendicular to mast

    4. MHBY Top width

    5. MUWY Upper width

    6. MTWY Three-quarter width

    7. MHWY Half width

    8. MQWY Quarter width

    Headsail

    1. IG Forestay height

    2. J Foretriangle base

    3. HLU Headsail luff length

    4. HHB Top width

    5. HUW Upper width

    6. HTW Three-quarter width

    7. HHW Half width

    8. HQW Quarter width

    9. HLP Perpendicular distance from clew to luff

    Spinnaker

    1. SLU Length of luff

    2. SLE Length of leech

    3. SFL Length of foot

    4. SHW Distance between mid points of luff and leech

    Screacher

    1. CLU Length of luff

    2. CLE Length of leech

    3. CFL Length of foot

    4. CHW Distance between mid points of luff and leech


Calculated Values

The following values are calculated and form part of the final TCF value:

Weight

  1. DC Crew weight allowance

  2. RD Rated displacement

Hull

  1. RL Rated length

  2. CCH Catamaran correction for main and headsail

  3. CCS Catamaran correction for main, headsail, spinnaker

  4. CCC Catamaran correction for main, headsail, screacher

  5. CCSC Catamaran correction for main, headsail, screacher, spinnaker

  6. VA Fixed keel allowance

  7. TPF Propeller type Allowance

Daggerboards and Foils

  1. BVA Vertical projected area of daggerboards

  2. BF Daggerboard factor

  3. VF Keel/Daggerboard factor

  4. BHA Horizontal projected area of boards / foils

Mast

  1. P Mainsail hoist

  2. PY Mizzen hoist

  3. PA Mast area

  4. PAY Mizzen mast area

Main Sail

  1. MA Mainsail area (as per IMS)

  2. MER Mainsail efficiency ratio

  3. MEF Mainsail efficiency factor

  4. RMA Rated mainsail area

Mizzen / 2nd main Sail

  1. MAY Mizzen area (as per IMS)

  2. RMAY Rated mizzen area

Headsail

  1. HA Headsail area calculated (as per IMS)

  2. HER Headsail efficiency ratio

  3. HEF Headsail efficiency factor

  4. RHA Rated area of headsail

Spinnaker

  1. SA Spinnaker area calculated (as per IMS)

  2. RSA Rated spinnaker area

  3. SMG% Ratio of SMG to SF

Screacher

  1. CA Screacher area calculated (as per IMS)

  2. RCA Rated screacher area

  3. CMG% Ratio of CMG to CF

Rated sail areas

  1. RSAH Rated sail area headsail only

  2. RSAS Rated sail area with spinnaker only

  3. RSAC Rated sail area with screacher only

  4. RSASC Rated sail area with screacher and spinnaker

Stable wind speed

  1. WR Righting moment

  2. WH Heeling moment

  3. WS Upwind windspeed in knots

Speed prediction

  1. VVH Predicted velocity headsail in knots

  2. VVS Predicted velocity spinnaker in knots

  3. VVC Predicted velocity screacher in knots

  4. VVSC Predicted velocity spinnaker and screacher in knots

Lift factor

  1. LH Lift in kg headsail

  2. LS Lift in kg spinnaker

  3. LC Lift in kg screacher

  4. LSC Lift in kg spinnaker and screacher

  5. LFH Lift factor headsail

  6. LFS Lift factor spinnaker

  7. LFC Lift factor screacher

  8. LFSC Lift factor spinnaker and screacher

Ratings

  1. TCF-H TCF headsail only

  2. TCF-S TCF spinnaker only

  3. TCF-C TCF screacher only

  4. TCF-SC TCF screacher plus spinnaker

  5. TCFL-H Light wind TCF headsail only

  6. TCFL-S Light wind TCF spinnaker only

  7. TCFL-C Light wind TCF screacher only

  8. TCFL-SC Light wind TCF screacher plus spinnaker