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post #11 of 25 Old 01-22-2014
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Re: Mainsheet system

Anything more than 6:1 is really too much spaghetti in the cockpit. Try a Google search on something like 'mainsheet fine tune' and you might get some more ideas. I did it on my boat, a First 375 (and I needed it too)
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post #12 of 25 Old 01-23-2014 Thread Starter
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Re: Mainsheet system

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Originally Posted by olson34 View Post
You might want to talk to the tech guys at Harken. Over a decade ago they worked with a local yard to develop a gross/fine system for a friend of mine with an Ericson 33 (the Ron Holland design with the fractional rig and monster mainsail).
It's a 5 to 1 / 10 to 1, using stacked fiddle blocks, double-ended sheeting. Pull either one for the 10 to 1, or pull both together for the speedier 5 to 1.
Works wonderfully.

I have crewed on the boat off n on for 15 years.

My own boat has a smaller main and gets by fine with a 6 to 1 system.
As someone once observed-- it's all just Choices and Options. But, the more purchase you have, the easier it is to really enjoy sailing the boat when the pressure goes up.

Cheers,
Loren
Interesting system, 10:1 fine, 5;1 coarse but there was still line in the cockpit for the 10:1 purchase, yes?

John
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post #13 of 25 Old 01-23-2014 Thread Starter
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Re: Mainsheet system

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Originally Posted by sandy stone View Post
Anything more than 6:1 is really too much spaghetti in the cockpit. Try a Google search on something like 'mainsheet fine tune' and you might get some more ideas. I did it on my boat, a First 375 (and I needed it too)
Sandy, this is my point. I'd guess that 6:1 alone wasn't enough for your 37.5 so you had a fine leg on the end. 8:1 isn't difficult or that expensive to rig but I'm looking at about 120' of line. I could do a 6:1 with a 3:1 fine without too much trouble. The only wildcard there is teaching the crew when to use the fine and coarse adjustments.

John
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post #14 of 25 Old 01-23-2014
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Re: Mainsheet system

Here's the Harken Manual on "Cascading" and "Gross/Fine" mainsheet handling systems: Harken

IMO - For a mainsail of your size and with end-boom sheeting typically such large 'power ratio' systems are unneeded, even without using 'winch assist'. Your 'end boom' sheeting provides a LOT of mechanical advantage all by itself. I myself raced a P30 (200 sq. ft. main) with end boom sheeting with a 4:1 mechanical advantage for many years and seldom needed 'more power' when pulling this system entirely by hand even when apply gorilla strain to the mainsheet, of course all the mainsheet system blocks were all roller bearing blocks.
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post #15 of 25 Old 01-23-2014
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Re: Mainsheet system

I set up fine tunes on pretty much every boat I sail. I would run a 6:1 with a 12:1 fine tune on your boat, but with a very short throw on the fine tune. This gets the excess line out of the cockpit.

In order to do this instead of dead ending the line on the becket, add a simple block. On the other end attach a small block w/ becket and cam. I away from the boat right now so I can't get a picture, but it's pretty commonly done. It only gives you a few feet of fine tune, but that's all you generally need.

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post #16 of 25 Old 01-23-2014
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Re: Mainsheet system

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Originally Posted by jfdubu View Post
Interesting system, 10:1 fine, 5;1 coarse but there was still line in the cockpit for the 10:1 purchase, yes?

John
Yup. The boat seems to have enough main sheet length that we've never run short. After a hard windy sail, when we come in to the dock, sometimes we run the tails back on one side until they are equal again.

Loren
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post #17 of 25 Old 01-23-2014
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Re: Mainsheet system

I have a 4-1 with another 4-1 on the back leg, giving me 16-1 for fine tune. I also have enough line on the micro 4-1 to douse the main when really windy, and pull it back in. Pretty nice when I only have a 195 sq ft. I would do the same with the OP's setup, but probably a 6-1 macro with a 6-1 micro, giving me 36-1 overall!
HEre is a picture.



Marty

She drives me boat,
I drives me dinghy!
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post #18 of 25 Old 01-24-2014
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Re: Mainsheet system

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This is exactly what you want. You could do a simple 6:1 and add a couple blocks to make a 12:1 and it would be perfect.

Merit 25 # 764 "Audrey"
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post #19 of 25 Old 01-26-2014 Thread Starter
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Re: Mainsheet system

I'm going to end up with some variant of a 6:1 coarse with a fine adjustment. I post pics when I finish the design.

John
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post #20 of 25 Old 01-26-2014
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Re: Mainsheet system

Don't underestimate the importance of the type of rope you're gonna use in such a system...

In my opinion, the choice of a single braid like NER's Salsa, or Yale's PHD makes a huge difference in how well these cascades will run, and general ease of handling...

Ph.D Racer Rope | Custom Racing Rope | Yale Cordage | Yale Cordage
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