Several years ago we covered this topic, but in the context of another discussion entitled "Yet another new DS2 owner", in the DS2 only section. For those interested in rigging and flying a spinnaker for the first time, it might be of interest to collect the relevant parts here, clean them up a bit, and possibly add some other items to round it out. Enjoy!
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A symmetric spinnaker, like on the DS, needs five lines to control it.
The first is the halyard. The block for that should be on the mast right above the forestay. It needs a cleat somewhere. If not on the mast, it needs a cheek block on the mast, near the base.
The next two are the sheets. Those need to be twice the length of the boat (I'm using 35'). They each need a block at the stern quarter, from where they lead back to the front of the cockpit for the crew to operate them. You may want to cleat one of them, the upwind one, or guy, esp if you are on a broad reach. So you'll need one spare cleat there.
Then you need two lines to control the spinnaker pole (up and down). For the uphaul (sometimes called "foreguy"), I use a short length of line with a doubled bungee at the end. There's an eyestrap on the mast, a bit below the forestay. The other end is tied to a shackle that clips on the middle of the pole. For the downhaul, I use a line from the same shackle down to a fairlead (or block) at the base of the mast and from there to a cleat. The downhaul then defines the pole height, the bungee on the uphaul keeps it tight.
You'll need a spinnaker pole, with fittings at each end, one goes on the mast ring, the other on the spinnaker sheet. In the middle there should be some kind of eye or ring to attach the shackle for up and downhaul to.
That's a lot of lines and parts and can be bewildering at first, but if you take your time and systematically rig everything, and then practice flying the spinnaker in light winds, you should be able to sort it out and get comfortable with it. In light to moderate conditions, I fly the spinnaker single handed.
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PS: this thread is not intended to be the "last word" on this subject; it merely collects what I think I've learned/figured out over the years. By all means add to, confirm or contradict what you read here.