I took a look at the NOR (thanks for the reminder Jeff), and it is interesting that some of the fleets have 10 races plus the medal race, while others have 15 plus the medal race. I'm sure that has more to do with logistics (the larger fleets seem to have the fewer races), but the medal race would weigh differently for the 10-race series fleets.
It is logistics, but not because of larger fleets - its because of different target times. Higher-performance classes tend to have shorter target times.
The dinghies have 50 minute targets - 2 races/day
Skiffs and catamarans have 30 minutes - 3 races/day
Boards have 20 - 25 minutes - 3 races/day (longer rest periods btw races)
(those came from the SIs for the ISAF World Cup - Melbourne)
