The measurements as reported on a yachts rating application form are critical to the establishment of the PHRF 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 rig and spinnaker pole, dimensions are quite possible, and common, which could result in the rating being declared invalid if the owner supplied incorrect information. To establish better understanding of, and consistency in the reported measurements, some definitions, and guidelines are provided, along with the unpenalized PHRF limitations, if applicable.
See Sail and Rigging Measurements for example showing measurement locations
|
MEAS |
LIMITS |
DEFINITIONS |
|
LOA |
|
Length
Over All (LOA) of the hull. Note
bowsprit and or boomkins separately. |
|
LWL |
|
Loaded
Water Line (LWL). If
unmeasured, use brochure LWL. |
|
BEAM |
|
Maximum
beam of the vessel. |
|
DRAFT |
|
Deepest
draft of hull. If centerboard
or daggerboard yacht include draft with board up and down. |
|
DISPL |
|
Vessel
displacement in pounds without crew, water, fuel, stores aboard.
If unmeasured use brochure DISPL. |
|
BAL |
|
Ballast
(BAL) of vessel in pounds. Note
any additions or deletions from standard and the location. |
|
J |
|
Distance
perpendicular from fore side of mast line to the point of intersection of
the forestay with deck. |
|
I |
|
Height
of fore triangle. Measured
from deck sheer line abeam the mast to highest point of sail attachment. |
|
P |
|
Luff
length of mainsail measured from boom to head board in its highest
position. |
|
E |
|
Foot
length of mainsail measured from the mast to clew in its most outboard
position. |
|
P2 |
|
Luff
length of mizzen (two masted boats only) measured same as P. |
|
E2 |
|
Foot
length of mizzen (two masted boats only) measured same as E. |
|
SH |
100%
I |
Spinnaker
Hoist (SH) measured from the deck sheer line abeam the mast to the highest
point of spinnaker attachment |
|
LP |
|
Length
of the Perpendicular (LP). Distance
perpendicular from the luff to the clew of the largest jib or genoa. |
|
LP% |
155% |
LP
length expressed as a percentage of J. |
|
SPL |
|
Spinnaker
(or whisker) Pole Length (SPL) measured with the pole in fitting and in a
horizontal position athwartship. |
|
SPL% |
100%
|
SPL
length expressed as a percentage of J. |
|
BS |
100%
J |
Distance
perpendicular from the fore side of mast line to the point of intersection
with the outermost point of sail attachment with the bow sprit. |
|
G |
|
Spinnaker
maximum Girth (G, also SMW), measured luff to luff. Fold on centerline, measure width, multiply by 2.
|
|
G% |
180%
|
G
measurement expressed as a percentage of J. |
|
SL |
|
Length
of Spinnaker Luff (SL) measured along luff tape from head to clew on the
largest spinnaker. |
|
SL% |
100%
|
SL
measurement expressed as a percentage of .95 times square root of (I
squared + J squared) |
|
ALU |
|
Length
of asymmetric spinnaker luff measured along longest luff tape from head to
tack. |
|
ALU% |
<110% |
ALU
measurement expressed as a percentage of the square root of (SH
squared + BS squared) |
|
ALE |
|
Length
of asymmetric spinnaker leech measured along shortest tape from head to
clew. |
|
AF |
|
Length
of asymmetric spinnaker foot measured along foot tape from clew to tack. |
|
AF% |
180% |
AF
length expressed as a percentage of BS. |
|
AMG |
|
Asymmetrical
maximum girth (AMG) measured from mid-point on luff to to mid-point on
leech on asymmetric sail. |
|
AMG% |
>80% |
AMG
width expressed as a percentage of AF. |
ROLLER FURLING CREDIT REQUIREMENTS AND LIMITATIONS
(This information is required on the
application form).
a.
Whether the furling drum is completely above deck level, or partially or
completely below deck level.
b.
All RF headsails must comply with paragraph 17 of the Standard
Sail and Equipment Specifications.
c.
All headsails must be tacked above the furling drum and have the head
secured to the bottom of the head swivel.
d.
Describe the: Furling System Type; Headsail Material; Year sail was
built, and type of UV protection on RF headsail.
FIXED PROPELLLER CREDIT REQUIREMENTS AND LIMITATIONS (This information is required if you are requesting a prop credit). To be eligible for rating credit, propellers must be of fixed design, with no folding or feathering mechanisms. The information required below must be provided with the request for credit, and is in addition to checking the proper block on the renewal or application forms. This information is required to assess each yachts propeller, and propeller installation, for approval of rating credit. The diagram included is intended to show approximate examples of exposed, and aperture installations only. Individual yacht installations may vary.
a.
A detailed diagram, or photo, of the propeller installation must
accompany all requests for fixed prop credits.
b.
You must specify the type of propeller installation
1)
_______ Aperture or,
2)
_______ Exposed
c.
______ Specify the number of blades of the fixed propeller
d.
______ Specify the diameter
of the propeller in inches.
e.
______ Specify the pitch of
the propeller in inches
f.
______ Specify the minimum
distance from the propeller to the trailing edge of the keel in feet (EXP, in
diagram).
g.
______ Specify the length of
the propeller shaft exposed (from hull/keel exit to propeller in feet (SHAFT in
diagram).
EXPLAIN ANY MODIFICATIONS. (Report
any variations from standard hull, rig, mast, keel, etc. on separate sheet)