Section 8
8
Page 72
Handicapping
8.1
VPP results as used for scoring
8.1.1 Velocity prediction All the calculations performed by LPP and VPP after taking in account Dynamic and Age allowances are eventually used in calculations of speed predictions for 7 different true wind speeds (6-8-10-1214-16-20 knots) and 8 true wind angles (52°-60°-75°-90°-110°-120°-135°-150°), plus the 2 “optimum” VMG (Velocity Made Good) angles: beating (TWA=0°) and running (TWA=180°), which are calculated obtaining an optimum angle at which the VMG is maximized. The calculations are done for the upwind sails (mainsail and jib) and downwind for the mainsail with each declared off wind sail, where the program then chooses the sail combination to produce best speed.
Table 15.
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Velocity prediction printed on the 1 page of the ORC International certificate
8.1.2 Time allowances The unique feature of ORC Rating system, making it fundamentally different from any other handicap system and much more precise, is its capacity to give and rate different handicaps for different race conditions because yachts do not have the same performance in different conditions. For example, heavy under-canvassed boats are slow in light airs but fast in strong winds. Boats with deep keels go well to windward and light boats with small keels go fast downwind. This means that yachts will have a variable time allowance in any race depending on the weather conditions and the course configuration for that particular race as managed by the Organizer. For the purpose of the Performance Curve Scoring as defined in the ORC Rating Rule 402, velocity predictions are also expressed as time allowances in s/NM where TA = 3600/v.
Table 16.
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Time Allowances and Selected Courses on the 1 page of the ORC International certificate