I'm reorganizing the running rigging on my Islander 28 and as more lines lead aft to the cockpit I'm thinking about replaciing the existing individual turning blocks with a deck organizer. The turning blocks have much larger sheave diameters than the organizer and also seem to be rather stout. Both the main halyard and the mainsheet can exert a fair amount of pressure on their individual turning blocks and a deck organizer in my mind would double the "static load" on the organizer block when the main is in use. Is it up to that use and is the smaller diameter sheave significant in terms of both strength and friction?
Deck Organizer Strength
- Thread starter knothead
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Go to the Harken website, then 'calculator' site and input the expected loads at the approx. angles of 'misalignment' from 'straight' ... such 'programs' usually have inbuilt Safety Factors that are appropriate for inshore/coastal/offshore design to cover 'unforeseen' and unexpected loadings. Use the 'breaking strength' (UTS) of the line as your starting point.
I would expect your turning blocks would stay in place, possibly reoriented, and simply feed the sheet/halyard to the deck organizer. The organizer is designed to accept loads normal to its sheave axis. Bottom line, you use both to get the line to the cockpit.
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