In a number of boats I've been on, the number 3 tracks allow a 'blade' type of jib to be led inside the shrouds, and the other long tracks are for the number 1 and 2 and the sails are led around the shrouds. As was said, the 1's are 150 or 155 or larger (depends on the boat but most PHRF groups limit these to 155% (don't ask why). On certain boats (J-30's come to mind), the number 1 for one design racing is a 160 or 163 or so. On the Pearson Triton it is 170+. They get a different rating than the PHRF boats with smaller genoas. The J-80 I race on has both tracks and the one design rating (blade only) is different than the PHRF (with a genoa).
I think some of the C&C 35's have this arrangement - a smaller track up forward, on or near the cabin top, which is for the smallest jib. The 30-1's were delivered with no tracks, one sheeted the genoa to the toe rail with a snatch block. That made for a rather wide sheeting angle and less pointing. Most owners have mounted tracks aft of the shrouds and in line with them to get better pointing performance. However, these are pretty far inboard for reaching when you would like to have the slot more open, so some folks have a device to lead the sheet back to the rail area. I sometimes use a snatch block on the rail and sometimes (light air) use the spinnaker sheet twing blocks. The boat reaches better when not choked in. There is no specific percentage for a number 2, it is just smaller than the 1, larger than the 3. Mine is about 140% - I bought it used from Bacon's and only use it for cruising and once in a while for breezier days. Gary 30-1
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