There are several YouTube videos that are applicable to J/24s. links to a couple of these have been added to the Article header.
In light air, three Fleet 71 J/24s squared off on Hampton Flats. The course was shared with 15 505s, 8 Vipers and 8 J/70s, roundabout, Rocket J and Quicky sailed two close races to complete the 2013 season. The lesson of the day was, pay attention to the course board.
roundabout 1 1 >> 2
Rocket J 3 2 >> 5
Quicky 2 DNF >> 6