WLYC Handicap Numbers 2017
Racing at Weatherby Lake...
2017 Portsmouth Yardstick Handicap Numbers:
2017 North American Portsmouth Yardstick Handbook.pdf
2017 North American Portsmouth Yardstick Pre-Calculated Classes.pdf
(These PDF files open in a separate browser window.)
Definition of Beaufort Range:
| Beaufort Range | 0 - 1 | 2 - 3 | 4 | 5 - 9 |
|---|---|---|---|---|
| Wind Speed (knots) | 0 - 3 | 4 - 10 | 11 - 16 | 17 - 47 |
| Wind Speed (mph) | 0.0 - 4.0 | 4.1 - 12.0 | 12.1 - 18.9 | 19.0 - 53.9 |
| Description | dead calm | light breeze | moderate breeze | whitecaps |
The Race Committee should observe sea conditions at the start, during and at the finish of the race and determine an average Beaufort Number for that race. Round off knots to nearest whole number or MPH to nearest tenth to determine Beaufort Number if anemometer is used. Care should be taken in observing that wind strength approximates that of the race course.
These handicaps assume standard class equipment:
| Boat Type | Code | Cls | D-PN | 0 - 1 | 2 - 3 | 4 | 5 - 9 |
|---|---|---|---|---|---|---|---|
| Sonar (155G) | SNR23 | KB | 79.3 | 82.1 | 80.3 | 78.9 | 76.7 |
| Sonar (Class Jib) | SNR23OD | KB | 81.0 | 83.3 | 81.9 | 79.8 | (75.0) |
| J/22 (Open) | J-222 | OS | 81.7 | 82.6 | 81.6 | 81.5 | (81.0) |
| J/22 (Class Jib) | J-22 | OS | 82.7 | 84.2 | 82.7 | 82.2 | 82.0 |
| Star (Int.) | ST | KB | 83.1 | 83.9 | 83.3 | 82.4 | (81.5) |
| Highlander | HI | CB | 84.3 | 87.8 | 86.3 | 82.7 | 80.5 |
| Y-Flyer | YF | CB | 86.7 | 89.5 | 87.9 | 86.4 | 83.4 |
| S2 6.7 Grand Slam | S2-6.7 | OS | 87.4 | 90.2 | 88.3 | 86.0 | [85.2] |
| Santana 20 & 20W | SNT20 | OS | 90.1 | 91.0 | 90.2 | 89.9 | 89.3 |
| San Juan 24 | SJ-24 | OS | 90.2 | 90.7 | 90.5 | 90.2 | 89.2 |
| Jeanneau 24 Tonic | JNO24T | OS | 90.9 | (92.5) | (91.5) | [89.5] | -- |
| Laser (Int.) | LASE | CB | 91.1 | 93.7 | 92.3 | 91.0 | 88.2 |
| US-1 (Int.) | US-1 | CB | 91.5 | 90.6 | 91.3 | 92.3 | 91.9 |
| Snipe (Int.) | SN | CB | 91.9 | 94.8 | 92.5 | 91.4 | 89.0 |
| Laser II (Int., w/Trap & Spi) | LASE-2 | CB | 92.8 | 95.6 | 94.6 | 93.6 | 88.8 |
| Sweet 16 | SWSX | CB | 96.2 | 99.4 | 95.9 | 94.7 | 94.3 |
| Catalina 22 (SK/WK, No Spi) | CAT22 | OS | 96.3 | 98.4 | 96.3 | 95.3 | 95.1 |
| Rhodes 19 | RDS19 | KB | 96.9 | 100.9 | 99.0 | 94.2 | 92.9 |
| Rebel | REB | CB | 96.9 | 96.2 | 96.1 | 96.0 | 96.0 |
| 420 (Int. or Club) | 420 | CB | 97.6 | 103.4 | 100.0 | 95.0 | 90.8 |
| O'Day 222 | ODY222 | OS | 98.3 | 99.9 | 99.1 | 97.3 | -- |
| Buccaneer 200 (W/E) | BCN24 | OS | (104.3) | -- | [105.0] | [101.8] | (100.0) |
| Butterfly | BUT | CB | 108.3 | 110.1 | 109.4 | 106.9 | 106.7 |
| Optimist Pram | OP | CB | 123.6 | -- | 124.0 | -- | -- |
Parentheses "( )" around numbers indicate numbers based on a limited amount of race data (5 to 15 data points) and are suspect. Brackets "[ ]" around numbers indicate numbers based on estimates from less than 5 data points or calculated from other rating systems formulae. Braces "{}" means the number is calculated from the f factor.
(Classes: KB=KeelBoat, OS=OffShore, CB=CenterBoard, MH=MultiHull)
Definition of alpha (α) correction for spinnaker:
|
OPTIONAL ALLOWANCE MODIFICATION FACTORS and US SAILING ALLOWANCE CODES
(D-PN) modified = (D-PN)(MF)1(MF)2 (HC) modified = (HC)BN(MF)1(MF)2 |
||||||
|
US Sailing Code for Allowance Description of Allowance |
Modification Factor for D-PN and Beaufort Number Ranges |
|||||
| Alpha Codes1 | D-PN | 0-1 | 2-3 | 4 | 5-9 | |
|---|---|---|---|---|---|---|
| * | Class normally with spinnaker, not equipped with one | 1.010 | 1.008 | 1.010 | 1.000 | 1.000 |
| S | Class normally without spinnaker, carrying one | 0.972 | 0.986 | 0.979 | 0.972 | 0.986 |
| G | Genoa, size undetermined (CB, MH Classes) | 0.985 | 0.974 | 0.980 | 0.995 | 0.990 |
| 1 Spinnaker modifications are not appropriate for short races (i.e., less than 30 minutes). | ||||||
These handicaps incorporate the alpha (α) correction:
| Boat Type | Code | α | D-PN | 0 - 1 | 2 - 3 | 4 | 5 - 9 |
|---|---|---|---|---|---|---|---|
| Sonar (155G, w/Spi) | SNR23 | 79.3 | 82.1 | 80.3 | 78.9 | 76.7 | |
| Sonar (155G, No Spi) | SNR23 | * | 80.1 | 82.8 | 81.1 | 78.9 | 76.7 |
| Sonar (Class Jib, w/Spi) | SNR23OD | 81.0 | 83.3 | 81.9 | 79.8 | (75.0) | |
| Sonar (Class Jib, No Spi) | SNR23OD | * | 81.8 | 84.0 | 82.7 | 79.8 | (75.0) |
| J/22 (Open, w/Spi) | J-222 | 81.7 | 82.6 | 81.6 | 81.5 | (81.0) | |
| J/22 (Open, No Spi) | J-222 | * | 82.5 | 83.3 | 82.4 | 81.5 | (81.0) |
| J/22 (Class Jib, w/Spi) | J-22 | 82.7 | 84.2 | 82.7 | 82.2 | 82.0 | |
| J/22 (Class Jib, No Spi) | J-22 | * | 83.5 | 84.9 | 83.5 | 82.2 | 82.0 |
| S2 6.7 Grand Slam (w/Spi) | S2-6.7 | 87.4 | 90.2 | 88.3 | 86.0 | [85.2] | |
| S2 6.7 Grand Slam (No Spi) | S2-6.7 | * | 88.3 | 90.9 | 89.2 | 86.0 | [85.2] |
| Santana 20 & 20W (w/Spi) | SNT20 | 90.1 | 91.0 | 90.2 | 89.9 | 89.3 | |
| Santana 20 & 20W (No Spi) | SNT20 | * | 91.0 | 91.7 | 91.1 | 89.9 | 89.3 |
| San Juan 24 (w/Spi) | SJ-24 | 90.2 | 90.7 | 90.5 | 90.2 | 89.2 | |
| San Juan 24 (No Spi) | SJ-24 | * | 91.1 | 91.4 | 91.4 | 90.2 | 89.2 |
| Laser II (Int., w/Trap & Spi) | LASE-2 | 92.8 | 95.6 | 94.6 | 93.6 | 88.8 | |
| Laser II (Int., No Spi) | LASE-2 | * | 93.7 | 96.4 | 95.5 | 93.6 | 88.8 |
| Sweet 16 (w/Spi) | SWSX | 96.2 | 99.4 | 95.9 | 94.7 | 94.3 | |
| Sweet 16 (No Spi) | SWSX | * | 97.2 | 100.2 | 96.9 | 94.7 | 94.3 |
| Catalina 22 (SK/WK, No Spi) | CAT22 | 96.3 | 98.4 | 96.3 | 95.3 | 95.1 |
(Note: It is assumed that all boats listed above normally carry a spinnaker as part of class racing equipment, except for the Catalina 22, so the alpha correction applies to these boats when they are always No Spi. The Genoa correction only applies to boats labeled CB or MH Class, not to OS Class.)
Starting Times for LD Classic race, using D-PN handicaps:
| Boat Type | Code | D-PN | Tme (min) | Start Time |
|---|---|---|---|---|
| Butterfly | BUT | 108.3 | 194.94 | (45:04) |
| Buccaneer 200 (W/E) | BCN24 | (104.3) | 187.74 | (52:16) |
| O'Day 222 | ODY222 | 98.3 | 176.94 | 03:04 |
| 420 (Int. or Club) | 420 | 97.6 | 175.68 | 04:19 |
| Sweet 16 (No Spi) | SWSX | 97.2 | 174.96 | 05:02 |
| Rebel | REB | 96.9 | 174.42 | 05:35 |
| Rhodes 19 | RDS19 | 96.9 | 174.42 | 05:35 |
| Catalina 22 (SK/WK, No Spi) | CAT22 | 96.3 | 173.34 | 06:40 |
| Sweet 16 (w/Spi) | SWSX | 96.2 | 173.16 | 06:50 |
| Laser II (Int., No Spi) | LASE-2 | 93.7 | 168.66 | 11:20 |
| Laser II (Int., w/Trap & Spi) | LASE-2 | 92.8 | 167.04 | 12:58 |
| Snipe (Int.) | SN | 91.9 | 165.42 | 14:35 |
| US-1 (Int.) | US-1 | 91.5 | 164.70 | 15:18 |
| Laser (Int.) | LASE | 91.1 | 163.98 | 16:01 |
| San Juan 24 (No Spi) | SJ-24 | 91.1 | 163.98 | 16:01 |
| Santana 20 (No Spi) | SNT20 | 91.0 | 163.80 | 16:12 |
| Jeanneau 24 Tonic | JNO24T | 90.9 | 163.62 | 16:23 |
| San Juan 24 (w/Spi) | SJ-24 | 90.2 | 162.36 | 17:38 |
| Santana 20 (w/Spi) | SNT20 | 90.1 | 162.18 | 17:49 |
| S2 6.7 Grand Slam (No Spi) | S2-6.7 | 88.3 | 158.94 | 21:04 |
| S2 6.7 Grand Slam (w/Spi) | S2-6.7 | 87.4 | 157.32 | 22:41 |
| Y-Flyer | YF | 86.7 | 156.06 | 23:56 |
| Highlander | HI | 84.3 | 151.74 | 28:16 |
| J/22 (Class Jib, No Spi) | J-22 | 83.5 | 150.30 | 29:42 |
| Star (Int.) | ST | 83.1 | 149.58 | 30:25 |
| J/22 (Class Jib, w/Spi) | J-22 | 82.7 | 148.86 | 31:08 |
| J/22 (Open, No Spi) | J-222 | 82.5 | 148.50 | 31:30 |
| Sonar (Class Jib, No Spi) | SNR23OD | 81.8 | 147.24 | 32:46 |
| J/22 (Open, w/Spi) | J-222 | 81.7 | 147.06 | 32:56 |
| Sonar (Class Jib, w/Spi) | SNR23OD | 81.0 | 145.80 | 34:12 |
| Sonar (155G, No Spi) | SNR23 | 80.1 | 144.18 | 35:49 |
| Sonar (155G, w/Spi) | SNR23 | 79.3 | 142.74 | 37:16 |
(Note: The above times are computed by assuming that the LD Classic race lasts exactly three hours (180 minutes), for a hypothetical boat with a handicap of 100.0. All boats should finish at the same time, in place.)