Twin mainsheets...why? - SailNet Community
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post #1 of 21 Old 01-03-2019 Thread Starter
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Twin mainsheets...why?

My wife and I are returning to BVI, chartering a 38' with a twin mainsheet config. I get that there might be some benefit in the set-up as a gybe preventer, but not much else. The vessel is supposedly brand new(ish). Why am I not seeing this twin set up as more than buttons on a balloon?

Any thoughts appreciated.
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post #2 of 21 Old 01-03-2019
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Re: Twin mainsheets...why?

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Originally Posted by 22catcapri View Post
My wife and I are returning to BVI, chartering a 38' with a twin mainsheet config. I get that there might be some benefit in the set-up as a gybe preventer, but not much else. The vessel is supposedly brand new(ish). Why am I not seeing this twin set up as more than buttons on a balloon?

Any thoughts appreciated.
Twin mainsheet. Do you mean two separate systems with separate blocks or do you mean it has two ends, not tied off, through the same block system?
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Re: Twin mainsheets...why?

I have a mainsheet rigged as both 8:1 and 4:1... for fine tune you use one line and for coarse trim you use both. For gybing you haul both.
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post #4 of 21 Old 01-03-2019
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Re: Twin mainsheets...why?

Might be in lieu of a traveler
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Re: Twin mainsheets...why?

I am not sure which system it is.

Thanks.
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Re: Twin mainsheets...why?

My Fantasia 35 had a twin mainsheet in lieu of a traveler.

It worked pretty well.
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Re: Twin mainsheets...why?

It is just a different way of achieving the sail control that a single mainsheet and traveller would provide. We just got a boat with a dual mainsheet, so I'm just getting used to it. It really doesn't do anything for jibe prevention because they don't project far enough for that.

Essentially, one sheet is used to position the boom, and the other to control the leach tension and twist. Catana is one popular brand that has used dual mainsheets for many years.

Our other boat has no traveller and a mainsheet on the hardtop inline with the boom. However, it has a rigid vang. So this system works by using the mainsheet to control the boom position, and the vang to control the leach and twist. One advantage it has over a traveller or dual sheet is that the sail can be controlled deep off wind using the vang.

So AFAIK, there are three ways to do the same thing regarding mainsail control: traveller and mainsheet, dual mainsheets, mainsheet and vang.

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post #8 of 21 Old 01-03-2019
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Re: Twin mainsheets...why?

If is a newer Jeanneau then you might be referring to a German Sheeting system, which is a double ended mainsheet run to both sides of the boat. They are typically led to both primary winches. The main benefit of the setup is so that both the Genoa and the main can be trimmed from the helm position, and both share the primary winches. Since the leeward winch is being used for the Genoa, the leeward mainsheet is cleated off, and the other end is on the windward winch.

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post #9 of 21 Old 01-03-2019
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Re: Twin mainsheets...why?

twin main - or German mainsheet - lets you control main sail from winches at either helm position. I'm assuming your 38 has dual helms like most newer charter boats. Just don't trim from the same side all the time - you'll run out of sheet.
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post #10 of 21 Old 01-03-2019 Thread Starter
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Re: Twin mainsheets...why?

Thanks all. Will be learning new stuff!
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