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Old 03-07-2012
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Main sheet attachment point

We discovered, while taking our new to us Northern 37 center cockpit ketch out for the first sail since the sea trials, that the mainsheet attachment point at the base of the mizzen mast would not work with the bimini up. The reason being, that the mainsheet blocks and line chafe against the aft edge of the bimini. I am thinking that if I can fasten an attachment point on the mizzen mast up above where the bimini is, Iíll be able to manage the main sheet by adding a few pieces of hardware to fair lead the lines to a winch and thus prevent the mainsheet from chaffing against the bimini and allow me to keep the cover up while sailing. I could use some advise on what sort of attachments would work, wither or not the forces would damage the mizzen mast, or any other cautions or creative fixes that might be considered.
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Old 03-07-2012
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Re: Main sheet attachment point

Seems to me an attachment that high up wrt the boom would have a lousy working angle and make proper sail trim very difficult - never mind the challenges of that kind of load on a mizzen attachment. However it doesn't look like there's a viable attachment point (or traveller location) on the cabin for any kind of mid boom sheeting either..



This is a tough one. Is there a break between a bimini and a dodger? Don't know the cockpit details but perhaps an attachment that would allow the sheet to work forward of the bimini.. a bridge deck traveller maybe? This may call for reinforcing the boom for the sheet attachment, but would be much better for sheeting than something 'high up and aft' of the boom end. The tail of the sheet could still be led forward if you needed it.. also a good vang would be highly recommended..

This may also be one of those occasions where a sturdy arch might fit the bill, though I'm not sure it would suit that style of boat aesthetically... and it would be expensive..
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Old 03-07-2012
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Re: Main sheet attachment point

I'd rework the bimini. Got any pics of the existing mainsheet rigging and bimini set-up?
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Re: Main sheet attachment point

Quote:
Originally Posted by Faster View Post
Seems to me an attachment that high up wrt the boom would have a lousy working angle and make proper sail trim very difficult - never mind the challenges of that kind of load on a mizzen attachment. However it doesn't look like there's a viable attachment point (or traveller location) on the cabin for any kind of mid boom sheeting either..



This is a tough one. Is there a break between a bimini and a dodger? Don't know the cockpit details but perhaps an attachment that would allow the sheet to work forward of the bimini.. a bridge deck traveller maybe? This may call for reinforcing the boom for the sheet attachment, but would be much better for sheeting than something 'high up and aft' of the boom end. The tail of the sheet could still be led forward if you needed it.. also a good vang would be highly recommended..

This may also be one of those occasions where a sturdy arch might fit the bill, though I'm not sure it would suit that style of boat aesthetically... and it would be expensive..
I have a "Wave Stopper" hard dodger and the bimini attaches to the top of it about a 3rd of the way foreward from the aft edge. Under the Wave Stopper there is not much room so we hit our heads a lot. Under the dodger I can stand with about an inch clearnce. I have no idea how the old owners sailed with the bimini up, however there are some pictures of them doing so. Maybe on a beam reach with the mainsheet attached to the toe rail. That would make for a very difficult tack or jibe, what with moving the sheet attachment from side to side each time. The bimini is part of a full enclosure set up with windows, screens, etc. so it is not something I can just "adjust" Putting in an arch abaft of the bimini might work, however, bracing it might a tuff go in as much at this boat has more wires holding the rig up than you can imagine. It is almost impossible to move about aft of the cockpit. My 21 year old, flexible daughter even complains when ordered to head aft. It looks like I'll have to have a rigger take a look at it. He has to inspect the standing rigging anyway so I might as well ask about the mainsheet while I'm at it.

see some photos at http://seaknots.ning.com/photo/from-...p?context=user

by the way, thanks for the line drawing. I have searched for information about the Northern and have not found out much about it. It has watertight bulkheads fore and aft which I think is cool.

Last edited by jmayton; 03-08-2012 at 06:51 AM.
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Old 03-07-2012
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Re: Main sheet attachment point

I'm thinking Jonesy is on the money. You really do need to work around the mainsheet when you do your bimini.

(my whoops ... didn't see OP's reply to Fast.)

Another thought ... you say it is not feasible to sail with bimini up yet you have pics of original owner doing so. Sounds a bit like our girl in that we have a full cockpit enclosure that when fully erected makes sailing a hassle other than on long single tack passages. Inevitably when we are sailing we fold most of it away but the previous owner found it all acceptable and rarely if ever folded it. Horses for courses I guess but PO did a lot more open ocean work than us.
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Last edited by tdw; 03-07-2012 at 09:14 PM.
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Re: Main sheet attachment point

Could you put a purchase on the topping lift of the main boom?
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Re: Main sheet attachment point

Maybe modify the bimini to fold forward that aft foot or so when sailing.....
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