A Cruising Spinnaker with a dousing sock can be a useful sail when downwind sailing with much less effort than using a spinnaker with pole. I stress the word CRUISING, as this is my type of sailing. For racing with an asymmetrical, see Ron and Mike's comments attached at the end of the article.
The tack of the sail may be connected to the bow in different configurations. To set a Cruising Spinnaker (Asymmetric downwind sail), first attach the halyard to the head ring on the sail. If your boat has a roller furling genoa, it is recommended that you use a set of PARREL BEADS that are wrapped around the furled genoa and then snap-shackled to the tack of the sail. Parrel beads are solid nylon balls with holes drilled through them, through which a wire cable passes. The cable has stainless-steel thimbles at either
end that are then shackled to the tack, making a closed loop of
beads around the genoa. The parrel beads roll over the furled genoa, allowing the tack of the cruising spinnaker to be raised and lowered with ease.
Ric & Beverly C320 "SnapShot"Next tie the tack downhaul line to the tack ring, leading it through a turning block on the deck near the bow, and run it aft to the cockpit. Set up the tack downhaul so the tack of the sail is about five feet above the deck when the sail is hoisted. Attach the spinnaker sheet to the clew ring of the spinnaker and make sure the line is led aft outside the lifelines to a turning block on the toe rail located just forward of the stern pulpit. Then run it forward to a winch. The sheet that is not being used lazy sheet- should also be attached to the clew of the spinnaker, led forward in front of the head stay, and then back on the other side of the boat outside the shrouds and lifelines to another turning block positioned just forward of the stern pulpit. Then take that sheet and lead it to a winch.
Once the sail is fully hoisted, and you head to your desired course you have two basic adjustments; the first deals with the height of the tack above the deck, and the second is the amount of sheet you should pull in for any given point of sail. A cruising spinnaker should be trimmed just enough to stop the luff from curling. Adjust the tack height so the middle of the luff curls first when you head the boat up into the wind. If the upper part of the luff curls first, the tack is too high and must be lowered. Conversely, if the lower part of the luff starts to curl first, the tack is too low. Which brings us back to where we started.adjusting the tack from the cockpit not having to run forward.
If this all makes me sound smart, thank you but I must give credit to Neil Pryde Yachtsail Newsletter. It is very informative.
Capt Al #55 "Kindred Spirit"
Keep in mind an asymmetrical when it collapses is handled the opposite of a symmetrical. With the asymmetrical you come up on the helm and trim the sheet to fill versus pushing the vessel down with a symmetrical. I've heard some figures reference the usable angles and testing shows that an asymmetrical is more efficient than a symmetrical 60-120 degrees AW.
It is sometimes possible to extend this to 135 if you can get the tack forward of the bow.
Over the 120 to 135 it is best to use a pole and a symmetrical kite as your VMG will suffer at high AW angles.
Any way to make it work the tack must be able to be adjusted up or down and in front of the head stay.
Mike Roll C-30 " Pisces"
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