Portsmouth Club Series
Notice Board
Notice of Race Amendment # 1 8/17/2023
The Portsmouth race #5 Saturday, August 26 1600 1 st Warning, additional races to follow 4
Change to a 4:00pm start on Saturday August 26
If multiple boats are owned, please submit separate registrations for each boat that may be sailed during the season.
The Portsmouth ratings (DPN) are found in the attached table in Race Docs.
Some common ones for quick reference are below:
| 420 | 97.60 |
| Flying Scot | 89.60 |
| Highlander | 84.30 |
| Thistle | 83.00 |
| ILCA 7 (Full) | 91.10 |
| ILCA 6 (Radial) | 96.70 |
| Sunfish | 99.60 |
| Vanguard 15 | 90.50 |
| Ultimate 20 | 79.90 |
Link for current ratings:
https://www.ussailing.org/competition/offshore/dpn/
Within the DPN page, there a link to the following document with many pre-calculated ratings too https://www.ussailing.org/wp-content/uploads/2018/01/2017-Portsmouth-Precalculated-Classes.pdf
What to learn more about Portsmouth?
PHRF to DPN formula on wikipedia
https://en.wikipedia.org/wiki/Portsmouth_Yardstick#USA_-_D-PN_and_PHRF
There is a linear correlation between the D-PN and PHRF, allowing the following conversion formulae:2007 D-PN
- D-PN = ( PHRF / 6 ) + 55
- PHRF = ( D-PN 55 ) × 6
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