ASA and PSIA Instructor
Join Date: Apr 2000
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FWIW I set my topping lift at the beginning of the season by ensuring a little slack when the main is trimmed close-hauled, then forget about it until time to remove the boom at the end of the season...
I guess if your boom droops over the cockpit when closehauled so there is no headroom you may want to tension the topping lift after dropping the main...but I bet many people release and tension the topping lift each time out without thinking about what they are doing.
Certified...in several regards...