Program for Jervis Bay Sailing Club

Jump to Courses and Information
Please click  DRAFT 2024-2025 CALENDAR/PROGRAM  for a copy of the Program in PDF.
Note: Please advise us of any changes in the program of events so that the program can be updated
For a simple way to measure distances to set leg length try this free Walk Meter App. It uses your phones inbuilt GPS and is free and easy to use. See the guides below for target leg lengths for various types of races and wind strengths.

For Latest Minutes Advantage Handicaps for Pointscore Races in PDF click  HERE for Results Sheet  HERE

EARLY DRAFT Jervis Bay Sailing Club 2024-2025 Calendar/Program


Date

Activity

8 Jun 2024

1st Frostbite Race

6 Jul 2024

2nd Frostbite

3 Aug 2024

3rd Frostbite; AGM in Clubhouse & Presentation

7 Sep 2024

4th Frostbite

21 Sep 2024

Ist Warmup Race

28 Sep 2024

2nd Warmup Race

5 Oct 2024

October Regatta; Spiral TT1

6 Oct 2024

October Regatta; Spiral TT1

12 Oct 2024

Championship 1; GOF 1

19 Oct 2024

Points 1

26 Oct 2024

Sprints 1

2 Nov 2024

Points 2

9 Nov 2024

Championship 2; ACT Champs

16 Nov 2024

Points 3; Richard's Boat => Support Boat

23 Nov 2024

Sprints 2; Spiral States at Avalon

30 Nov 2024

Points 4

7 Dec 2024

Championship 3

14 Dec 2024

Points 5

21 Dec 2024

Sprints 3

28 Dec 2024

No Race Christmas Break

4 Jan 2025

Points 6

11 Jan 2025

Championship 4; Nowra Marathon (proposed) 1130 start; GOF 3

18 Jan 2025

Catch-up Race; Championship 4

19-23 Jan 2025

Sunday 19 to Thursday 23 Jan Aero Nationals

25 Jan 2025

No Race Australia Day

1 Feb 2025

Points 7

8 Feb 2025

Sprints 4

15 Feb 2025

Points 8

22 Feb 2025

Championship 5

1 March 2025

Catch-up Race

8 March 2025

Points 9

15 March 2025

Sprints 5

22 March 2025

Points 10

29 March 2025

Championship 6

5 April 2025

Points 11

12 April 2025

Sprints 6

19 April 2025

No Race Easter

26 April 2025

Points 12

3 May 2025

Championship 7

10 May 2025

Points 13

17 May 2025

Sprints 7

24 May 2025

Points 14

31 May 2025

Catch up Race

7 June 2025

1st Frostbite Race

5 Jul 2025

2nd Frostbite

2 Aug 2025

3rd Frostbite; AGM in Clubhouse & Presentation

6 Sep 2025

4th Frostbite

20 Sep 2025

Ist Warmup Race

27 Sep 2025

2nd Warmup Race

4 Oct 2025

October Regatta; Spiral TT1

5 Oct 2025

October Regatta; Spiral TT1

6 Oct 2025

Labor Day Holiday


------------------------------

Courses and Race Length Information

The Club runs three series throughout the season using various courses (see below):

Shortcut for Courses / Times / Leg Lengths

Event Course Number of Races per day Indicative Time (10-15 knots) Indicative Leg length (10-15 knots)
Sprints Triangle Sausage 4-6 20 minutes 550 m
Championship Triangle Sausage Triangle 2 45 minutes 800 m
Pointscore Triangle Sausage Triangle Sausage 1 90 minutes 1100 m

Common Courses - Olympic Triangle with Port Roundings (Red Flag) (as shown in diagram); Starboard roundings can be used (Green Flag)


For a definitive guide for setting courses of various types and configerations see the Set Courses App

The courses for the three events run by the club are:
Sprints (scratch start / yardstick) - Aim for 4-6 races each Sprints Day, back-to-back
=> Indicative Race Duration 20 minutes (550 m leg lengths in around 10 knots)

=> Start-Triangle-Sausage-Finish

Championship (scratch start / yardstick) - Aim for two races on each Championship Day, back-to-back
=> Indicative Race Duration 45 minutes (800 m leg lengths in around 10 knots)

=> Start-Triangle-Sausage-Triangle-Finish

Pointscore (handicap start - minutes advantage)
=> Indicative Race Duration 90 minutes (1100 m leg lengths in around 10 knots)

=> Start-Triangle-Sausage-Triangle-Sausage-Finish
----------------------------------------------------

Course Elements - Port Roundings
Course Elements - Port Roundings

Indicative 60-60-60 Triangle leg lengths for race duration for various wind speeds

Note:
Yellow Marine Park buoys => 1380 m apart
Red Hazard Buoys => 800 m apart

Pointscore

Triangle-Sausage-Triangle-Sausage

wind range

5-8 knots

8-12 knots

12-15 Knots

15+ Knots

Leg length for 30 min Race (nm)

0.2

0.3

0.3

0.4

Leg length for 30 min Race (km)

0.4

0.5

0.6

0.6

Leg length for 45 min Race (nm)

0.3

0.3

0.4

0.5

Leg length for 45 min Race (km)

0.5

0.6

0.7

0.9

Leg length for 60 min Race (nm)

0.4

0.5

0.6

0.7

Leg length for 60 min Race (km)

0.7

0.9

1.1

1.3

Leg length for 90 min Race (nm)

0.5

0.6

0.8

1.0

Leg length for 90 min Race (km)

0.9

1.1

1.5

1.9

Leg length for 120 min Race (nm)

0.7

0.9

1.1

1.2

Leg length for 120 min Race (km)

1.3

1.7

2.0

2.2

Championship

Triangle-Sausage-Triangle

wind range

5-8 knots

8-12 knots

12-15 Knots

15+ Knots

Leg length for 30 min Race (nm)

0.3

0.3

0.4

0.5

Leg length for 30 min Race (km)

0.5

0.6

0.7

0.8

Leg length for 45 min Race (nm)

0.4

0.5

0.6

0.7

Leg length for 45 min Race (km)

0.6

0.8

1.2

1.3

Leg length for 60 min Race (nm)

0.5

0.6

0.8

0.9

Leg length for 60 min Race (km)

0.9

1.1

1.5

1.7

Leg length for 90 min Race (nm)

0.7

0.9

1.2

1.4

Leg length for 90 min Race (km)

1.3

1.7

2.4

2.6

Leg length for 120 min Race (nm)

0.9

1.1

1.4

1.6

Leg length for 120 min Race (km)

1.7

2.0

2.6

3.0

Sprints

Triangle + Sausage

wind range

5-8 knots

8-12 knots

12-15 Knots

15+ Knots

Leg length for 20 min Race (nm)

0.3

0.35

0.4

0.4

Leg length for 20 min Race (km)

0.5

0.55

0.7

0.75

Leg length for 30 min Race (nm)

0.4

0.5

0.6

0.6

Leg length for 30 min Race (km)

0.6

0.8

1.0

1.1

Leg length for 45 min Race (nm)

0.6

0.7

0.8

0.8

Leg length for 45 min Race (km)

1.0

1.2

1.4

1.5

Leg length for 60 min Race (nm)

0.7

0.9

1.1

1.2

Leg length for 60 min Race (km)

1.3

1.7

2.0

2.2

Leg length for 90 min Race (nm)

1.1

1.3

1.5

1.6

Leg length for 90 min Race (km)

2.0

2.4

2.8

3.0

Leg length for 120 min Race (nm)

1.4

1.8

2.2

2.4

Leg length for 120 min Race (km)

2.6

3.4

4.0

4.4

Laser Speeds for Upwind, Runs and Reaches under various wind strengths


Laser Radial
Wind Range 5 - 8 Knots 8 - 12 Knots 12 - 15 Knots 15+ Knots
Units Min/Nm Min/km Min/Nm Min/km Min/Nm Min/km Min/Nm Min/km
Upwind Speed 22 11.9 20 10.8 17 9.2 16 8.6
Run Speed 18 9.7 14 7.6 10 5.4 9 4.9
Reach Speed 13 7.0 10 5.4 8 4.3 7 3.8
Laser Full
Wind Range 5 - 8 Knots 8 - 12 Knots 12 - 15 Knots 15+ Knots
Units Min/Nm Min/km Min/Nm Min/km Min/Nm Min/km Min/Nm Min/km
Upwind Speed 20 10.8 19 10.3 16 8.6 15 8.1
Run Speed 17 9.2 12 6.5 10 5.4 9 4.9
Reach Speed 12 6.5 9 4.9 7 3.8 6 3.2

See this link for addition leg length guides for Regattas

REGATTA - Indicative Leg lengths for race duration under various wind speeds

Amendments to the Pointscore Handicap Systems

Note: For the Pointscore the slower yachts are given several minutes start ahead of the faster yachts ('Catch me if you can'). Ideally all yachts should finish very close together.

The handicaps are adjusted after each race according to the following scheme:
1st place => loss of 2 minutes
2nd place => loss of 1 minute
3rd place => no change - stay as you are
4th place and all other starters (including DNF) => plus 1 minute
All non-starters have no change to their handicaps, except when all the scores need to be adjusted to avoid negatives. For example, when the winner has a Minutes Advantage Handicap of 1 minute and would lose 2 minutes, to a -1 minute handicap for the first place, ALL handicaps are increased by 1 minute so that the winner's new handicap is 0 (zero).
Note: The committee and handicapper will make periodic adjustments to the system to keep it as fair and functional as possible, and to assign handicaps to new members and visitors.
See the latest Minutes Advantage Handicaps as PDF

Course Area Distance Guide (see attached map below)

Incidentally => From the Red Point buoy to the top Yellow Marine Park buoy (A1) is NE and 1580 m in length, so setting bottom mark 200 m out from red buoy in that direction and setting the top mark after travelling 800 m towards the A1 Marine Park Buoy gives a great default set up for prevailing NE winds with an ideal leg length of about 800 m.

Note: Leg lengths can be set using the yellow GPS tool, or an app you install on your phone, or the Map Plotter, or by motoring at a constant speed or revs between the two red buoys and noting the time taken for this 800 m distance. Motor for the same time and speed to set the distance between the buoys for your course.

See the Map below for the distances between key markers in the bay


Download the map as a PDF Course Area Distance Guide
Map
Key Marker Lengths in Hare Bay for setting courses

Expected Race Times for Various Yardsticks

The table below shows the winning margin required by yachts faster than a Spiral (bigger yardsticks) for the yachts classes shown so that there is an all class Dead_heat finish on corrected time (after applying yardsticks).
For example, for a Spiral having an elapsed time of 24.8 minutes for a designated 20 minute race => their corrected time would be 20 minutes: 
  • The margin for a Finn would be 2 minutes ahead i.e. finish time 22,8 minutes; corrected time 20 minutes)
  • The margin for an International Canoe would be 6 minutes ahead (i.e. finish time of 18.8 minutes )
  • The margin for an RS Aero 7 (+ Laser Full) would be 2.3 minutes ahead (i.e. finish time of 22.5 minutes )
  • etc.
It also shows wait time between back-to-back races.



20 min race 45 min race 60 min race 90 min race
Class yardstick Winning Margin to dead-heat (mins) Winning Margin to dead-heat (mins) Winning Margin to dead-heat (mins) Winning Margin to dead-heat (mins)
Int Canoe 93.5 6.1 13.7 18.3 27.5
Finn 112.0 2.4 5.4 7.2 10.8
Laser Full 114.0 2.0 4.5 6.0 9.0
Laser Radial 118.5 1.1 2.5 3.3 4.9
RS Aero 7 112.5 2.3 5.2 6.9 10.4
RS Aero 5 116.8 1.4 3.2 4.3 6.5
Spiral 124.0 0.0 0.0 0.0 0.0
Spiral Race Time
24.8 min 55.8 min 74.4 min 111.6 min

Interesting Yardstick Comparisons

The yardsticks and times shown below provide some interesting match-ups.
The Aero options are vastly different 5 to 9 => 116.8 to 109.3, spans Laser Radial to Taser. With such a light-weight hull, performance will be markedly affected by skipper weight.

Class Yardstick

Expected time

for 90 min race

Minutes advantage

so all finish in dead-heat

Laser 4.7 125 72 18
Spiral 124 73 17
Laser Radial 118.5 76 14
Aero 5 116.8 77 13
Laser Full 114 79 11
Aero 7 112.5 80 10
Finn 112 80 10
Aero 9 109.3 82 8
Taser 108 83 7

Additional Comparisons

Yacht Sail Area Yardstick Hull Length Hull Weight (kg)
Finn 10.6 112 4.5 107
Laser 7.1 114 4.2 59
Laser Radial 5.8 118.5 4.2 59
Laser 4.7 4.7 125 4.2 59
RS Aero 5 5.2 116.8 4.01 33
RS Aero 6 6.2 114.6 4.01 33
RS Aero 7 7.4 112.5 4.01 33
RS Aero 9 8.9 109.3 4.01 33
Spiral 6.5 124 3.8 55
Spiral (small ) 5.6 131.5 3.8 55