BillT wrote:Right at the aft end, on both sides, there are these small cheek blocks, two on each side:
aft cheek blocks.jpg
I'm thinking that these were used for the main sheet in its original configuration, and perhaps they are no longer used, since he re-rigged the main sheet ... ?
Not a bad guess. The two standup blocks, the inner pair, so to speak, are indeed most likely for an original traveler in end-boom sheeting. You can remove them, if you feel like it, or leave it until you're sure you like sailing with the traveler.
However, the second (outer) pair of blocks are most likely for the spinnaker sheets. Your boat seems to have been set up for the symmetric spinnaker. See "
How to Rig and Fly a Spinnaker".
I know your stated aim is just to potter about in a boat, but while my (beer can) racing friends were the ones that pushed me in to trying it out, I now routinely use it when cruising. I like to set things up so at least one leg is downwind (yes, at times both), so I get a lot of opportunities. And as crazy as it sounds with all the sheets and lines, it's not that hard to singlehand.
BillT wrote:Next up are these mystery lines - one on each side, passing through a hole in the side deck right next to the cabin, passing into the cabin, and then through a hole in the aft bulkhead of the cabin, and to a cam cleat - I have circled them in red...
First, what you haven't circled. These are special hooks that you can hook the spinnaker guy through. You may know that, but just in case and for anyone curious about, but not experienced with symmetric spinnakers: the spinnaker has no tack, but two clews. These are each connected to a line lead aft to the blocks you found. The leeward one is used just as you expect, and called "sheet". The windward one is called the guy and is first lead through a jaw on the spinnaker pole, then hooked through that little hook, and from there to the block at the stern. The little hook changes the angle to be more downward, which helps the guy do its job which is to control the angle of the spinnaker pole.
At each gybe, the pole is brought over and the role of guy and sheet are switched. That's the reason you only have a hook for the guy and not a fixed eye, because you need to unhook it when it becomes a sheet.
The two mystery lines are called "twings". They should end in a ring through which the spinnaker sheets are lead. You can use them to pull down on the sheets a bit to make for a better angle. Booth the hooks and the twings are some of the more "advanced" spinnaker controls. If you are new to flying a spinnaker, you can get by without them, but after you have the basics down, you might want to experiment to see whether you can get them to work for you.
I would not recommending removing them, definitely not the hooks. I would recommend you try out a spinnaker, if your sail inventory has one, or even go out and get one, if not. If you don't have a spinnaker pole, you an
make your own.
All this hardware makes it look like the boat was sailed by someone serious. If you don't already have the experience/knowledge, just leave some of the advanced controls alone at first, but trust me, it'll be more fun over the years to figure out how to use them and to get good at it. In the meantime, here's a recap of which controls are the most
basic ones.