The charts provided below give the race officer the best 'first guess' for course length for varying wind speeds. Experience of a class cannot be underestimated but the data given here is reasonably accurate for those who do not work with these classes regularly.
Keelboats
Use the IRC rating to find the average VMG whilst racing (assuming that the boats are beating for approximately 50% of the time) for different wind strengths.
RS:X
Men will start to go onto the plane at 10 knots whilst women plane at 12 knots. On a windward leeward course, room has to be given between the gate and the start line to accommodate the slalom, if this is to be used in planing conditions. In general terms 0.2nm is the space given.
RS:X Men Speed Charts - Gate 0.05nm from Start Line
RS:X Men Speed Charts - Gate 0.2nm from Start Line
RS:X Men Speed Charts - Slalom at 10 knots
RS:X Women Speed Charts - Gate 0.05nm from Start Line
RS:X Women Speed Charts - Gate 0.2nm from Start Line
RS:X Women Speed Charts - Slalom at 12 knots
RS:X Speed Graph
Other One Design Classes
29er Speed Charts - Windward/Leeward Course
49er Speed Charts - Windward/Leeward Course
470 Men Speed Charts - Trapezoid Course
470 Women Speed Charts - Trapezoid Course
Finn Speed Charts - Trapezoid Course
Finn Speed Charts - Windward/Leeward Course
Laser Radial Speed Charts - Trapezoid Course
Laser Standard Speed Charts - Trapezoid Course
Star Speed Charts - Windward/Leeward Course
