How to get an HPR rating

HPR is a measurement rule, which means that all factors which are used to calculate the rating are taken from measurable speed-producing parameters of the boat, the sails and the crew. HPR also embraces the UMS, or Universal Measurement System, whereby all race boats are fully-measured so that their collection of measurements becomes a “passport” identity for the boat, usable for any measurement rating system.

Using the UMS concept, an HPR rating can therefore be calculated by supplementing measurement data taken under other rating systems, such as IRC, ORR or ORCi. Sections 5 and 6 below describe that process.

So, here is a simple guide for getting your HPR rating:

1. For all boats, sail measurement certificates for the largest main, jib and spinnaker are required to certify the dimensions of sails used for the event.

2. With the exception of sail certificates, the Chief Measurer has the authority to use sistership data if he deems it sufficiently accurate. When multiple sisterships have been measured, the data from the fastest one will be used.

3. Vertical Center of Gravity (VCG) is required for all boats. This is determined in two possible ways:

a. from an inclination combined with a hull file and a hydrostatics calculation, or

b. a component method under development by HPR whereby total VCG is determined by component weights and VCG’s. Those components are: mast weight and VCG, boom weight plus the keel weight and VCG. Once this component method is completed, this will be offered as an alternative to the inclining method.

HPR is collecting statistical information on the inclining method and the component method to guide improvement of the VCG term to account for measurement “noise” associated with each method. If you are interested in helping this HPR development, here is an opportunity to submit both inclined VCG and component VCG information on your boat. Please contact your Rating Authority for detailed instructions before starting the component process.  

4. HPR is developing a gyration corrector so mast weight and VCG plus boom weight will likely be required for all boats so instruct your measurer to get this data when the mast is out of the boat.

5. If you have a Fully Measured ORR or ORCi certificate some additional measurements are needed to issue an HPR certificate. Those measurements are:

a. spreader sweep angle

b. freeboard abreast the face of the mast*

c. bow overhang

d. transom vertical height above (or below) the water*

*these are measured in "lightship" trim - i.e., with the boat empty

In addition, your ORR displacement and stability will be corrected to “lightship” trim which is based on a truly empty boat.

If needed, contact your rating authority (US Sailing in the US) to review these additional measurements.

6. If you have only an IRC certificate: You will also need some additional measurements.

a. spreader sweep angle

b. freeboard abreast the face of the mast*

c. forward freeboard*

d. aft freeboard*

e. Rig IG, ISP, BAS, FSP

f. VCG (see section 3)

*these are measured in "lightship" trim - i.e., with the boat empty

Contact your rating authority (US Sailing in the US) to help find a measurer qualified to take these remaining measurements needed for HPR.

7. If you have no certificate or only a PHRF certificate: Contact your rating authority (US Sailing in the US) to see if there is sistership data available and what additional measurements may be required.

HPR certificates for events to take place in 2013 will be issued by US Sailing. It is anticipated that starting in 2014 ORC will calculate and post certificates. The Rating Authority in each country will remain be responsible for the accuracy of the input data and servicing the certificate holder. The HPR Measurement Authority shall have a final overview of the accuracy of the data as needed.

US Sailing-issued HPR certificates are good for one calendar year, for a fee of $8/foot LOA. Revisions due to rule updates are free throughout 2013, and new certificates issued for minor changes (eg, new sails) are $200.

For more information, contact HPR rule author Bill Lee at This email address is being protected from spambots. You need JavaScript enabled to view it. , or by phone on +1 831 476 9639.