Table IV
| Table IV
Calculation Of Portsmouth Numbers and Wind Handicaps | ||||||||
| (D-PN) = A + [B(Rating)] (HC) = (f)(D-PN) | ||||||||
|
D-PN |
||||||||
| Class |
Formulae Constants |
Factors (f) for BN Ranges | ||||||
| Class | Type | Rating |
A |
B |
0-1 | 2-3 | 4 | 5-9 |
| Centerboard Classes | I | MR | 143.9 | -2.758 | 1.060 | 1.010 | 0.970 | 0.970 |
| II | MR | 96.0 | -0.308 | 1.071 | 1.008 | 0.941 | 0.941 | |
| III | MR | 113.4 | -1.392 | 1.023 | 1.004 | 0.973 | 0.973 | |
| IV | MR | 213.1 | -8.227 | 1.010 | 0.978 | 0.974 | 0.974 | |
| V | MR | 113.1 | -1.790 | 1.026 | 1.016 | 0.967 | 0.967 | |
| VI | MR | 117.6 | -1.780 | 1.055 | 1.026 | 0.975 | 0.975 | |
| VII | MR | 205.5 | -7.940 | 1.014 | 1.001 | 0.935 | 0.935 | |
| VIII | MR | 109.1 | -1.160 | 1.012 | 1.010 | 0.990 | 0.990 | |
| IX | MR | 209.8 | -9.231 | 1.009 | 0.991 | 0.985 | 0.985 | |
| Multihull Classes | PMR | 14.3 | 58.74 | 1.070 | 1.030 | 1.000 | 0.950 | |
| Keelboat Classes | I | DR | 106.4 | -0.952 | 1.017 | 1.008 | 0.984 | 0.984 |
| II | DR | 110.9 | -0.602 | 1.041 | 1.021 | 0.944 | 0.944 | |
| III | DR | 141.0 | -2.620 | 1.017 | 1.008 | 0.971 | 0.971 | |
| IV | DR | 124.6 | -1.014 | 1.018 | 0.986 | 0.980 | 0.980 | |
| V | DR | 105.5 | -0.960 | 1.048 | 1.016 | 0.908 | 0.908 | |
| Offshore Classes | I | DR | 114.7 | -1.183 | 1.027 | 1.023 | 0.960 | 0.940 |
| IOR | 110.1 | -0.861 | ||||||
| MORC | -- | -- | ||||||
| PHRF | (See Table VI) | |||||||
| II | DR | 138.1 | -2.167 | 1.008 | 1.006 | 0.990 | 0.985 | |
| IOR | 136.1 | -2.190 | ||||||
| MORC | 116.5 | -0.993 | ||||||
| PHRF | (See Table VI) | |||||||
| III | DR | 155.1 | -2.615 | 1.017 | 1.008 | 0.980 | 0.971 | |
| IOR | 109.1 | -0.977 | ||||||
| MORC | 129.1 | -1.493 | ||||||
| PHRF | (See Table VI) | |||||||
| IV | DR | N/A | 1.017 | 1.008 | 0.992 | 0.990 | ||
| V | DR | N/A | 1.007 | 1.002 | 0.992 | 0.990 | ||