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Sun Jun 19, 2016 2:18 pm

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Can someone please post pictures of their boom downhaul? I'm redoing mine and want some ideas for how to get some cranking leverage. A guy named Rick at the Small Craft Palooza taught me some tricks about cranking on the downhaul and I want to make sure that I can really keep it tight.

Thanks.

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Tue Jun 21, 2016 7:22 am

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What are the tricks? I have a line tied with a bowline a round the mast and led to the front off the boom and then down to a cleat by the side off the mast on the cabin top. Sorry no pictures yet.



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Tue Jun 21, 2016 4:51 pm

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This is for the boom downhaul, not the halyard.

The trick is simply to keep the leading edge of the sail as taut as possible. Hence the idea to have a few blocks to increase your leverage.

I drew up a 3:1 scheme for myself that I can implement that leaves the line attached to the boom for easy breakdown when stowing everything. I know Simeon and others have at least 3:1 and maybe more.

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Aug 2014 SCAMP Camp
http://building284.blogspot.com



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Tue Jun 21, 2016 8:16 pm

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I had mine like the plans last year. The blocks lay on the deck. I saw how Simon had his and I copied his. It seems better.



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Wed Jun 22, 2016 6:13 am

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I've been using the purchase as indicated on the plans and it has given all the leverage I've needed. If you want more leverage then replace the lesser sheaved block with one with an extra sheave. You'll have to make sure you can tie off the bitter end with the end you need though. You might need a longer line. My issue on downhaul was having a too flexible boom. I built a box boom (aka "The Equalizer") to overcome that. The purchase has worked fine for as tight as I want it, up to the point of the line slipping in the cam cleat. The one change I'd like to make is moving the purchase from the cabin top to the space between the cabin top and the boom. Less room there but the blocks beat the crap out of the paint on the cabin top.

Michael Storer has a great webpage on tuning the balanced lug rig. Search around for that. I know the link has been posted on SCA before. Keep us posted!

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Thu Jun 23, 2016 6:12 pm

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https://m.youtube.com/watch?v=FkjuHzF4GPo
Check out the video at about 1:20. You can clearly see this down haul.
Jeff



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Tue Jun 28, 2016 9:45 pm

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I think this is Michael Storer's page about rigging a lug rig. It was very helpful.

I decided that 3:1 leverage was acceptable. With this design, I can leave the line attached to the boom and just feed it through the fiddle and the cleat when rigging. Should be simple to rig. The plans as drawn have 4:1 leverage.

A few more pictures on my build blog linked below.


Attachments:
File comment: The fairlead and cam cleat on the cabin top.
cleat.jpg
cleat.jpg [ 80.58 KiB | Viewed 2742 times ]
File comment: Block with becket on the boom and fiddle block on the cabin top.
tackle.jpg
tackle.jpg [ 130.65 KiB | Viewed 2742 times ]

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Aug 2014 SCAMP Camp
http://building284.blogspot.com

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