There are a lot of factors involved in setting the jib/genny correctly for performance.
- What is the boat?
- Is the mast
and rig in proper adjustment?
- Are the sails
in good shape?
- Is it a jib or a genny we are talking about?
Sorry for the questions to your questions but it may help with a better answer.
- In general, yes. You move the cars back to depower the jib/genny
However with proper crew weight on board you should rarely (never?) have to depower a jib in winds up to 25-30kts. Although at the upper end of wind
speed it can be an exciting ride.
- For performance it is usually ideal that the telltales (if placed properly on the sail) "break" at the same time bottom to top.
This will occur if the cars are in the right location, the rig is tuned properly and the sail is not blown out.
- To check the tells go out in 10 knots or so of wind
. Set the sails
close hauled with the tells all flying. Slowly head
up and see which tells break first. If the uppers move the car forward. If you can't get the tells to break together (or near enough) likely your rig is out of tune or the sail is blown out.
It can be a real PITA to try and tune a sail that is bagged out. Basically you probably can't be satisfied.
I raced J24's for 2 season's (so am no expert) and there are several sail maker sites that have good tuning and trimming guides for these boats. The basics apply everywhere so I would Google
and download a couple of them. I like the one from North Sails.