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One Design Definitions

23 November 2015
The following are adjustments that PHRF-NE normally makes to a base boat for non standard equipment.

The base boat is assumed to in as-built configuration with a 155% genoa (unless only a non-overlapping sail can be carried), a spinnaker/whisker pole length equal to J, a spinnaker width equal to 1.8 times J, a spinnaker height equal to .95 times the square root of I squared plus J squared, and either a folding or feathering propeller on an exposed shaft, a two bladed solid propeller in an aperture, or an outboard motor sufficent to drive the boat at the square root of the waterline length in knots.
 IMS sail definitions apply, particularly with respect to mainsail girths for other than One Design boats. Sprit boats will be handicapped in the configuration shown on the application. If the boat differs from the base boat, the following adjustments apply:


Two bladed solid propeller on an exposed shaft +6 sec/mile
Three bladed solid propeller on an exposed shaft +9
Three bladed solid propeller in an aperture +3
Two bladed feathering propeller in an aperture -3
Three bladed feathering propeller in an aperture 0
Outboard fixed in well with two bladed solid propeller +6
Inboard with exposed shaft in place of outboard +3 to +9


155.1 - 160%  -3
160.1 - 170% -6
Over 170% -9
Largest Lp 135% or less +3 (Cruising Canvas handicap only)
Self tending jib +3

Bloopers are considered headsails


Pole length and/or spinnaker width excess (2 inch tolerance) -3 per 10% or fraction
Spinnaker halyard height (ISP) greater than I -3 per 8% increase or fraction

RIG HEIGHT ADJUSTMENT (Both I and P increased)

0.5% to 3% -3
3.01% to 5% -6
5.01% to 7% -9
7.01% to 9% -12
9.01% to 11% -15
11.01% to 13% -18
13.01% to 15% -21


0.5% to 10% -3
10.01% to 20% -6


It is intended not to give credit for minor reductions in sail area. Therefore credit will not unless a significant reduction is made. An example would be that you would have to reduce the boom length (mainsail foot) by at least 5% to get a credit.


In cases where the base boat has an aluminum mast, changing to a carbon mast will result in a handicap charge of between 3 and 6 seconds per mile, depending on the relative section of the aluminum mast. There is usually not a charge for changing to a carbon boom.


A boat with shrouds and/or headstay made of something other than wire or stainless steel rod, such as PBO, will normally incur a handicap adjustment unless all boats of that class have such rigging.  Backstays are excluded from this adjustment. This will be considered on a case by case basis.


Limited inventory, above deck jib roller furling, polyester, pentex, or mylar only in working sails, no exotic sail materials such as kevlar, spectra, technora, etc..
A maximum of:
One nylon spinnaker
One jib with Lp > 110%
One jib with Lp =< 110%
Heavy weather jibs and storm sails are allowed. Staysails are allowed if the boat has a true cutter rig and the staysail is used upwind. Staysails are allowed if they are only used as part of the heavy weather/storm sail configuration.


Working roller furling with sail attached to swivel and above deck drum are required. If the drum is below deck, the credit will be halved. Boats that come with built in roller furling are not eligible for this credit. In cases where the intent of this adjustment is not honored, the credit will be denied.  The credit may also be reduced on performance boats to 3 seconds per mile. Special racing roller furling sails are not allowed. As a rule of thumb, the foot skirt should not exceed 3 percent of the foot length in depth. If the boat is cutter rigged, the staysail must also be roller furling and be capable of being used upwind.

J Boats with sprits are not eleigible for the recreational handicap as the standard configuration has already been considered when establishing the base handicap.


With no battens or positive roach +6
With battens and/or positive roach +3


On a case by case basis. It is assumed that the modification was made to improve speed.


If tables, doors, stoves removed Depends on what is removed


Any excess of MGU, MGM, MGT and HB (IMS definitions measured perpendicular to luff) 

Sport boats are handicapped with their One Design girths

Depends on excess

CRUISING HANDICAP - No free flying sails (this includes  no mizzen staysails of any kind)

Normal masthead rig  +12 from racing handicap
Normal fractional rig  +6 from racing handicap
15/16s rig (I is greater than P, but not masthead)  +9 from racing handicap
15/16s rig (I is greater tahn P, but not mastbead, but the spinnaker is masthead +12 from the racing handicap 
Fractional rig with ISP greater than 1.01 times IM  +9 from racing handicap
Lp 135% or less, but not if small jib standard  +3 additional from cruising handicap
SPL > J but Whisker pole length = J  +3 additional from racing handicap
If a boat has a centerline asymmetric spinnaker credit, this credit will not be taken into account when determining the cruising handicap.  
A staysail is allowed on a normal cutter rig. The cutter rig staysail must be used up wind. As only one headsail at a time may be flown by a sloop, a staysail shall not be flown by a sloop.  


If part of standard boat 0
If in addition to a symmetrical spinnaker if tacked to the spinnaker pole. -3
If an asymmetric tacked to the bow on a boat with a symmetric tacked to a pole 0
 If an asymmetric spinnaker, tacked on the centerline, is added to a boat without a symmetric spinnaker on a pole, this matrix applies. The adjustment breaks are based on the presence of a sprit and if there is a sprit, the length relative to the J measurement. This assumes the maximum width of the asymmetric spinnaker is no more than 1.8xJ+Sprit Length. If wider then there will be an additional charge. There is no credit for undersized spinnaker widths.
  Tack to Bow 10% Sprit 20% Sprit 30% Sprit
  +9 +6 +3 0




Maximum width = 1.8 x JC (Does not apply to boats where this spinnaker is standard. Sport boats are handicapped with the largest class spinnaker.  
Minimum mid girth, mid leech to closest luff point = .75 x max width

Boats that have an asymmetric spinnaker as standard will be handicapped in the class configuration. Variations
from the class standard will have a handicap adjustment. In general, the credits are intended to assist true cruising boats. Race boats may not get the full 9 credit for asymmetric spinnakers tacked to the bow.

Many dayboats the base configuration assumes an asymmetric tacked to the bow. These boats will not get additional credit.


Close reaching/Code 0 spinnakers are designed to fill a hollow in the polar diagram. Since there is no common definition of what a Code 0 spinnaker is, PHRF NE has adopted the term close reaching spinnaker' for these. These sails are charcterized by as being made of a laminate or aramid material and have a substantial luff rope for the large luff tensions that these sails require. 

If the Lp of the jib is 130% or greater the charge for the close reaching spinnaker is 3 seconds per mile. If the Lp of the jib is less that 130% the charge is 6 seconds per mile.

Since all modifications cannot possibly be anticipated, other changes will be considered on a case by case basis. Obvious attempts to take advantage of perceived loopholes may result in loss of credit

Click HERE to see a list of modified boats.


Some fleets, if enough "sport" boats are available, may want to establish a separate class as these boats are difficult to handicap with more conventional boats. Defining just what is a sport boat is a problem. Sport boat usually have the following characteristics, among others:

1. Displacement-Length Ratio less than 100

2. Upwind Sail Area-Displacement Ratio greater than 30

3. Downwind Sail Area-Displacement Ration greater than 75

4. A sprit length greater than 50 percent of J

The above four criteria are guidelines. There can be exceptions, one way or the other, from these criteria. The bottom line is that if it looks like a duck and quacks like a duck, it might be a duck.

Sport boats do not follow many of the guidelines used to handicap boats. Sport boats are handicapped in their "as presented" configuration, whatever it is. This includes spinnaker and jib sizes as well as mainsail girths. The base handicaps will be with the class spinnaker, with the exception of the J105 and the J130 where the "jumbo" spinnaker is considered the base spinnaker. Note that this is not the J105 One Design handicap. If a change is made in this configuration, it must be reported to the local fleet handicapper. 

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