Hardware Questions

[chaaaaaaaz]

I came from sailing traditional wooden schooners/skipjacks so I am not wholey familiar with some of these newfangled things.
Can you tell me what these are for?
This is a Cheoy Lee Luders 36 Sloop,the mast height is about 41'.

Picture 1: Are these wire rope sheaves? The picture is blurry, but those are the wire rope end of wire-rope halyards reeved through both.

Picture 2: Am I right in assuming one of these is a spinnaker halyard? Is it normal to have 2 blocks? How are they used? Would only be in service at a time since they would surely interfere with eachother? There aren't enough cleats on the mast if the main and jib/genoa halyards are made fast.

Picture 3: This block is on the forward face of the mast, about a foot or so below the spreaders, is it part of a spinnaker pole rig?

Any and all information is welcome as well is sources of learning more about how to use them.

thanks!
Chaz and Emily
s/v molamola blog

[FloridaWriter]

You are right on all three counts. In photo 2 the spinnaker blocks usually are not fixed but on "cranes" that typically extend at a 30 or 45 degree angle to each side of the head stay. Usually you will only fly a chute on one halyard, but the second halyard gives you a back up headsail halyard, for instance. The fixed block just below the spreaders is for a topping lift for the spinnaker pole.