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Re: C&C 30 MK1 Sheet size needed
Can you stretch the sail out and fold it in half down the middle? If the two corners (clews) land on top of each other it's a symmetrical spinn and normally a pole is required (not a whisker pole, a double ended spinnaker pole). If the two clews do not align and the two edges of the sail are different length then you can be sure it's an asymmetrical and can be flown without a pole. If you have a sleeve for the forestay it can be used if you choose but it's not necessary.. it will give the sail more stability but may limit your ability to go deep downwind.
If it's an asymm then you could put a block on your tack shackle on the bow, and run the tack line aft so you can set the height of the tack as you trim.
If it's in a 'sock' and called a flasher or cruising spinn then it's most likely asymmetrical. Judging by the way your boat was rigged up, you should have a proper spinnaker halyard (above and outside the forestay) Be sure to use that one.
You should have a block shackled to the toe rail either side just aft of the winch, and don't plan to run a headsail at the same time, at least not right away. The sheet should probably run outside the lifelines, but observe how/if the sheet is pulling against them.
Choose a day with light but not too light winds.. keeping these things flying without enough wind is frustrating. If things get out of hand and the wind pipes up, release the sheet and haul down the sock.. preferably going downwind so this can be done in the wind shadow of the mainsail.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)