Roller furling lead blocks??? - Page 2 - SailNet Community
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post #11 of 15 Old 12-21-2012
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Re: Roller furling lead blocks???

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Originally Posted by plederman View Post

does the ratchet block give me any difficulty when i want to open the sail more?

thanks
Nope, the fluted sheaves are designed for the line to SLIP through and with very little friction when the sheave is locked by the ratchet and the 'tail tension' is released.
If you need to 'snub' just add a wee bit of 'tail tension' ... and the ratchet block will develop 10 times the amount of friction holding power that you apply to the tailed part of the line. Again, the ratchet block must be 'matched' to the size of line used.
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post #12 of 15 Old 12-21-2012 Thread Starter
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Re: Roller furling lead blocks???

I would like, in summation, to put together a system based on everyone's kind insights. PLEASE correct my synthesis if you please

So...my first block off the furler, which i will attach to a forward stanchion,...should be just a regular block for 3/8 line

My second block or fairlead...will probably go on the deck approaching my cabin entry

I would then add a ratchet block...just before my cam cleat.....and I would need that block close enough to engage and disengage the ratchet..the ratchet block should be exactly made for 3/8 line (most of the ones i see have a range of lines they fit)


seems like alot of hardware

did too many cooks spoil the meal?

peter
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post #13 of 15 Old 12-21-2012
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Re: Roller furling lead blocks???

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Originally Posted by RichH View Post
Nope, the fluted sheaves are designed for the line to SLIP through and with very little friction when the sheave is locked by the ratchet and the 'tail tension' is released.
If you need to 'snub' just add a wee bit of 'tail tension' ... and the ratchet block will develop 10 times the amount of friction holding power that you apply to the tailed part of the line. Again, the ratchet block must be 'matched' to the size of line used.
Rich,
Very interesting stuff. Sailing traditional schooners over the last decade or so, I've no experience with the ratchet blocks. Do you think they would be of value on our 53'r or are the loads disproportional using 3/8ths furler line? From what I gather from your first post, I'd need to add the ratchet block farther aft making a 180ish degree turn to the winch for it to work properly.
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post #14 of 15 Old 12-21-2012
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Re: Roller furling lead blocks???

You don't need the ratchet.
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post #15 of 15 Old 12-21-2012
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Re: Roller furling lead blocks???

Of course you dont 'need' a ratchet block, just like you dont 'need' winches, braided line, bottom paint, fairlead cars, jacklines and tethers, etc. etc.

Capta, the 180 'engagement' promotes the best control and the highest friction, they 'can' be used with as little as a few degrees of 'engagement' with the line but of course with less friction and more 'slip potential' when under load.

Here's Harken's write-up on their ratchet blocks: Harken Ratchet Blocks

FAQ - http://www.harken.com/blocks/QandARatcheBlocks.php

Last edited by RichH; 12-21-2012 at 08:58 PM.
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