Took the viper out for another sail today and found out I needed to understand the jib better. The last boat I had was a taipan 4.9 with an old style jib. Trimming the new style F16 self tacking jib has turned out to be trickier than I expected, so was hoping you guys might be able to answer some of my questions

1. The jib track controls the angle of the jib while the jib sheet control the twist. Is that a correct belief?

2. Is it possible for the self tacking jib to back wind the main since it doesn't overlap?

3. Where do I put the jib car going upwind? I normally put it around 10cm in from the edge of the track. Is this right? Is the jib car setting something that you guys adjust a lot on an upwind leg of a windward leeward race course?

Any info would be really appreciated. Thanks so much