From yesterday's thread:
To set your jib lead position correctly, sailing closehauled, head up:
- if the upper windward telltale lifts first, move the block forward,
- if the lower windward telltale lifts first, move the block aft.
In light air you may want to adjust the proper position a little forward for fullness, in heavy air, a little back to flatten the bottom of the sail.
This technique works equally well with a partially furled genoa, other than the telltales may disappear into the turns...
Certified...in several regards...