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The measurements of a yacht as reported on her rating certificate or rating application form are critical to the establishment of their boat's rating. The responsibility for supplying accurate measurements rests solely with the owner of the boat. Although builder-supplied information can and should be consulted, particularly with regard to hull measurements, considerable variances between yachts of the same class can be possible. Variances in the dimensions of the rig are quite possible, and common, which could result in the rating being declared invalid if the owner supplied incorrect information. Spinnaker poles are principal violators, as many builders do not hold precisely to the 'J' measurement. In the hope of establishing some consistency in the taking and reporting of measurements, some guidelines are provided here. Refer to the diagrams on the next pages.
DEFINITIONS
LP
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Distance perpendicular from the luff to the clew of the largest jib.
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MGT
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Mainsail girth from 7/8 leech to nearest point on mainsail luff.
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MGU
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Mainsail girth from 3/4 leech to nearest point on mainsail luff.
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MGM
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Mainsail girth from 1/2 leech to nearest point on mainsail luff.
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MGL
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Mainsail girth from 1/4 leech to nearest point on mainsail luff.
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MH
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Mainsail headboard width.
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SA
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Sail Area (including main and 100% fore triangle + mizzen).
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SPL
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Spinnaker or whisker Pole Length measured with the pole in its fitting and set in a horizontal position athwartship.
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BS
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Distances perpendicular from the fore side of mast line to the point of intersection with the outmost point of sail attachment with the bow sprit.
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G
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Spinnaker maximum Girth luff to luff. Fold on centerline, measure width, and multiply by two. Same as (SMW).
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SL
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Spinnaker Luff length along red/green luff tape from head to clew on the largest spinnaker.
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ALU
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Length of asymmetrical luff from head to tack.
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ALE
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Length of asymmetrical leech from head to clew.
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AF
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Length of asymmetrical foot from clew to tack.
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AMG
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Asymmetrical spinnaker maximum girth luff to leech.
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BASIC UNPENALIZED LIMITATIONS
ROLLER FURLING CREDIT LIMITATIONS
Please check appropriate box:
Requirements for Roller Furler (RF) Credit
There are five (5) dimensions as listed below that are required for PHRF boats that use oversize girth mainsails. The dimensions should be taken from the leech measurement point to the nearest point on the mainsail luff. Refer the mainsail girth measurement diagram on the PHRF website (www.phrfchesbay.com) for an example of the MGU (3/4 girth) measurement.
MH Mainsail headboard width.
REQUIRED INFORMATION FOR FIXED PROPELLLER CREDIT REQUESTS
A diagram, or photo, of the propeller installation must accompany all requests for prop credits. You must specify the type of installation (aperture or exposed), supplying the following information:
Fixed Propeller Measurements
To be eligible for rating credit, propellers must be of fixed design, with no folding or feathering mechanisms. The required information must be provided with the request for credit, in addition to renewal or application forms.