Using the spinnaker pole
However, there is a trick if you want to steer even further downwind. This would be a course more suitable for a conventional, symmetrical spinnaker. There is a good way of adapting your asymmetrical for deep downwind sailing, again as beautifully shown in the video.
When sailing downwind, the asymmetrical spinnaker will get blanketed by the mainsail. This is the effect that we use to our advantage when hoisting or dropping the sail. But now we want the sail to be as effective as possible.
To be able to pull the sail clear out of the wind-shadow created by the mainsail, we use the spinnaker pole. Because the asymmetrical is cut with a very low tack, the pole has to be set on the mast as low as possible. When the pole is set, we can run a new sheet, the guy, through the outboard end of the pole and to the tack line, where it can be clipped on (this is demonstrated very well in the video).
The pole can then be trimmed, pulling the sail out to the “windward” side. The three lines – guy, tackline and uphaul of the pole – can fix the pole in a stable position.
To prevent the aft leech of the sail from swaying too much and to stabilize the sail even more, a trim-line to the sheet will do the trick. The “Tweaker” as it is called by Amy and Matt is easily attached with a snatch-block. It is used to pull the sheet down and thus stabilize the sail. Again, this is clearly shown in the video.