by ChrisR » March 19th, 2015, 8:11 am
If you are attaching it to the main sheet, then just enough to allow the traveller to go out on one side with about 2 or 3 feet to spare when it comes through the jammer.
In total you are talking the width of the beam + 2 or 3 feet.
You don't need it to long, presuming that your mainsheet is long enough.