Ideal
Hi,
Sorry to have neglected your question, but I've been way off the grid. Manufacturers give those angle recommendations, but when laying out winches I like to use a piece of the actual rope, led from the actual block(s), and go for a lead such that the line is not rubbing on the angled base of the drum. That way you get an override-free lead, but no needless friction, let alone the possibility of an underride.
If the winch is for Genoa sheets, consider a fixed aft block, for a constant ideal lead to the sail.
Fair leads,
Brion Toss
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