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 > Offshore Home > Portsmouth Yardstick > Formulas > Table V

Table V

Table V

Relationship of DPN To PHRF

The US SAILING Portsmouth Committee has determined that generally:
A DIFFERENCE OF 1 DPN = A DIFFERENCE OF 6 SECONDS PHRF

Therefore:

D-PN

PHRF

D-PN

PHRF

D-PN

PHRF

54.5 = – 3 73.0 = 108 91.5 = 219
55.0 = 0 73.5 = 111 92.0 = 222
55.5 = 3 74.0 = 114 92.5 = 225
56.0 = 6 74.5 = 117 93.0 = 228
56.5 = 9 75.0 = 120 93.5 = 231
57.0 = 12 75.5 = 123 94.0 = 234
57.5 = 15 76.0 = 126 94.5 = 237
58.0 = 18 76.5 = 129 95.0 = 240
58.5 = 21 77.0 = 132 95.5 = 243
59.0 = 24 77.5 = 135 96.0 = 246
59.5 = 27 78.0 = 138 96.5 = 249
60.0 = 30 78.5 = 141 97.0 = 252
60.5 = 33 79.0 = 144 97.5 = 255
61.0 = 36 79.5 = 147 98.0 = 258
61.5 = 39 80.0 = 150 98.5 = 261
62.0 = 42 80.5 = 153 99.0 = 264
62.5 = 45 81.0 = 156 99.5 = 267
63.0 = 48 81.5 = 159 100.0 = 270
63.5 = 51 82.0 = 162 100.5 = 273
64.0 = 54 82.5 = 165 101.0 = 276
64.5 =

57

83.0 = 168 101.5 = 279
65.0 = 60 83.5 = 171 102.0 = 282
65.5 = 63 84.0 = 174 102.5 = 285
66.0 = 66 84.5 = 177 103.0 = 288
66.5 = 69 85.0 = 180 103.5 = 291
67.0 = 72 85.5 = 183 104.0 = 294
67.5 = 75 86.0 = 186 104.5 = 297
68.0 = 78 86.5 = 189 105.0 = 300
68.5 = 81 87.0 = 192 105.5 = 303
69.0 = 84 87.5 = 195 106.0 = 306
69.5 = 87 88.0 = 198 106.5 = 309
70.0 = 90 88.5 = 201 107.0 = 312
70.5 = 93 89.0 = 204 107.5 = 315
71.0 = 96 89.5 = 207 108.0 = 318
71.5 = 99 90.0 = 210 108.5 = 321
72.0 = 102 90.5 = 213 109.0 = 324
72.5 = 105 91.0 = 216

etc.

etc.
NOTE: The above table is a guideline that is intended to supplant calculated methods
of determining D-PNs normally found elsewhere in the Portsmouth Yardstick.
DPN = PHRF / 6 + 55
PHRF = D-PN – 55 x 6

These conversion factors should not be regarded as absolute, and
Race Committees should make adjustments based on their local experience.









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