Variables
Hi there,
Okay, we know the boat. The ideal location for the blocks will be about as far aft as the forestay is forward of the mast, though this will almost invariably be modified by issues of deck traffic, the location of other fittings, proximity to house sides, etc. I'll check my files for Valiant 40's,and see if we recorded a length.
As far as the block goes, I definitely agree that a snatch block is a bad idea; you'll essentially be putting standing rig loads on this block, and its escape vector aims it at your head when you are in the cockpit, so you want something simple and stout. Not sure what the best choice for this job will be; the load on the block will probably be about the same as the load on the line, and you want a generous safety factor.
To get meaningful hardware you need to know the loads on everything, as well as the assorted safety factors.
Fair leads,
Brion Toss
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