Ahh but that is why we here now fix the end of the halyard to the mast base and only have (8 + 4) mtr / 2 - 2,5 mtr = 3,5 mtr of line trailering behind the boat. Much less than the 8 + 4 - 2,5 = 9,5 mtr of the older methode.

8 mtr. is the distance from bag to spi gate
4 mtr. is the excess of line after the tack is pulled out.
2,5 mtr. is the length of the trampoline and hulls which are behind the mast foot.

Wouter