I was out on a cat last saturday that had a Spifurl furler
for the asymmetric spinnaker
It worked amazingly well. Here is part of what I wrote on another forum
We started out with the wind at 120 to 150 degrees, so out came the asymmetric spinnaker
on it's Spifurl system, one I had not seen before. The sail comes out of the bag as a furled sail with the small endless roller at one end and a bearing system at the other. The sheets
are attached, the roller end clips on to a line on the bowsprit
, and the endless furling line which is only 2-3 meters long, is led back to the back of the trampoline for a good secure working position. The halyard
is attached, sail raised and unfurled nice and easily.
Once the sail was unfurled, the whole furling system came into view, it is simply a dyneema
line between the furler at the bottom and the bearing system that attaches to the halyard
. Halfway up this line which is around 12mm/½" thick, a thinner line is attached to the leading edge of the asymmetric sail. What happens is, the thin line is first wound around the dyneema
furling line, and then the middle section of the sail is pulled in first, resulting in a very neatly furled spinnaker.
Retrieving and setting the asymmetric was a breeze, in fact much easier than using the pull down bag system that i have now.
This system and a swinging prodder like 44C wants would be the ideal setup for single handing downwind.
Whether you chose an asymmetric spinnaker, a Code0 or a screacher depends on what angles you want to run. On a fast boat like yours, I would go with a slightly flatter cut, as you will be pulling your relative wind forward more than on a heavy boat.