Mainsheet attachment for 28 CK?

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SFBaysailor
Posts: 56
Joined: Sun Apr 29, 2018 10:12 am

Mainsheet attachment for 28 CK?

Post by SFBaysailor »

Since I’m done with my porthole replacement project, I attacked the cabin top today. Handrails are gone, fairleads up by the hatch are gone, and I’m eyeing the mainsheet block attachments.

I’ve seen photos with the mainsheet blocks sheeting to a single padeye mid-deck with a 3:1 system. I’ve got three single blocks on padeyes, one center and two About 20” outboard from it on either side. I can’t see any tremendous benefit in keeping that system, since it doesn’t look original and needs rebedding anyway. I can see where there might be a small benefit when close hauled in getting some downward tension on the boom.

My thought is to go with a triple/triple block one center feeding to a stand-up block on the port side giving a fair lead to a Harken cam next to the companionway. I’ll replace the center deck padeye with something substantial with proper backing plates. Am I going in the right direction here?
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Castaway
Posts: 219
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Location: Lerwick, Shetland Isles

Re: Mainsheet attachment for 28 CK?

Post by Castaway »

On our F 35 (UK), we have a track across the coach roof, and I wouldn't care to do without. Another owner, after sailing with us, put one on his F35 as a result, and is very pleased with it. It helps with sail shape when close hauled. Before he did it, our almost identical boats were not evenly matched upwind, but now they are. I certainly would not replace any other system with a central pad-eye for the mainsheet.

If you can get hold of one (and have it fitted to the curve of the roof), a traveller with control lines like the mizzen sheet will allow you to optimise the sail shape upwind, from the cockpit, and also reduce the length of sheet you will need compared to a central fixing, when running.

My friend's new Harken track and traveller is super smooth; I am quite jealous! He said the hardest part about fitting it was getting the headlining out, and sealing all the holes for the track fixing, but you will only have to do it once, and I presume you already have the headlining out.

Regards,

Gerald
Gerald Freshwater,
s/y 'Castaway', (UK F35 cat ketch, centreboard, 1987)
Lerwick Boating Club
Shetland Isles, Scotland

SFBaysailor
Posts: 56
Joined: Sun Apr 29, 2018 10:12 am

Re: Mainsheet attachment for 28 CK?

Post by SFBaysailor »

Thanks, Gerald.

I'm probably not going as far as installing a traveler, but I will likely use the outboard attachment points in an inverted "V" configuration. I've got a small exhaust stack in the center for my heater, so eliminating that middle block would be better to keep the sheet from sweeping across that area anyway.

Jeff

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seadago
Posts: 103
Joined: Sun Jun 03, 2012 8:42 am
Location: Lowestoft, England

Re: Mainsheet attachment for 28 CK?

Post by seadago »

Jeff, Gerald
I just had an epifany.
I've been wrestling with the same problem in Nausikaa. I have a central anchor point for the main sheet, mid roof, and I just can't seem to get my main flat enough to point above 45 deg effectively. Considered installing a curved traveller as most F35s have, but overall cost was discouraging, to put it mildly.
How about a "soft" traveller? e.g. a fixed-length of braided Dyaneema (or a ss cable for that matter), fairly tight, anchored on two fixed points on the cabin roof edge. Attached to the lower block of the sheet purchase there would be a small single block (upside down) through which would run the dyaneema "rail". Control lines for the horizontal position of the lower sheet purchase block would be as in any std fixed traveller.
A 10 mm 12 strand braided Dyaneema 75 chord will withstand 3 tons of load. This system would spread dynamic loads on the coachroof between two anchor points, instead of only one as I have now. DIY job.
What do you fellahs think?
Rafa
Rafael
s/v Nausikaa
SSR 30570, sail GBR 4619L
F30 CK (Hoyt), wishbones, centreboard, G10 rig. Built by Fairways Marine, Humble, UK, '82
Beta 16 hp with two-blade prop

SFBaysailor
Posts: 56
Joined: Sun Apr 29, 2018 10:12 am

Re: Mainsheet attachment for 28 CK?

Post by SFBaysailor »

Interesting thought. When I read this, I thought of a Laser traveler.
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I just filled 35 holes in my deck with epoxy this afternoon, so I’m going to think long and hard about new hardware!

Jeff

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seadago
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Location: Lowestoft, England

Re: Mainsheet attachment for 28 CK?

Post by seadago »

Exactly!!! Thanks Jeff. At least we know the concept is viable! 👍
Rafael
s/v Nausikaa
SSR 30570, sail GBR 4619L
F30 CK (Hoyt), wishbones, centreboard, G10 rig. Built by Fairways Marine, Humble, UK, '82
Beta 16 hp with two-blade prop

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seadago
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Joined: Sun Jun 03, 2012 8:42 am
Location: Lowestoft, England

Re: Mainsheet attachment for 28 CK?

Post by seadago »

Guys
Here's my "soft" traveller.
An 8 mm braided Dyaneema line, attached to the handrail, with very little slack, that serves as a guide and takes some of the upward tension load from the boom.
Two 8 mm braid-on-braid polyester as control lines on either side. These I attached to the cabin roof, over a little block of teak to provide a safety gap above the solar panels.
I tested the prototype a couple of days ago. Without the traveller, Nausikaa would just refuse to move at any less than 45 deg from the wind. With the traveller, yesterday I was doing 5.5 knots on 20 apparent at just over 30 degs!
Overall, very pleased with the result. The whole thing still has to prove sturdy enough, but so far, so good!
Cheers
Rafa
Attachments
traveller 3.jpg
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traveler 1.jpg
traveler 1.jpg (83.07 KiB) Viewed 254 times
Traveler 2.jpg
Traveler 2.jpg (79.32 KiB) Viewed 254 times
Rafael
s/v Nausikaa
SSR 30570, sail GBR 4619L
F30 CK (Hoyt), wishbones, centreboard, G10 rig. Built by Fairways Marine, Humble, UK, '82
Beta 16 hp with two-blade prop

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Castaway
Posts: 219
Joined: Sat Dec 13, 2008 8:40 pm
Location: Lerwick, Shetland Isles

Re: Mainsheet attachment for 28 CK?

Post by Castaway »

Rafael,

That looks very neat, and keeps clear of the solar panels, too. Much easier than fitting a track across the deck. How are you doing for rope storage in the cockpit?
I have a single line to the tackles for traveller control, hanging in a loop below the sprayhood, held by a pair of clutches. Theres enough slack to allow the traveller to move across 2/3rds of the track if I'm taking short tacks, but I don't have to have two full lengths of line, saving about 2m of loose stuff lying around.

Hope you are getting some sailing this summer; Scotland is still in lockdown, and we have no chance of driving to Sweden, where our boat is ashore, before the end of the short Baltic season.

Regards,

Gerald
Gerald Freshwater,
s/y 'Castaway', (UK F35 cat ketch, centreboard, 1987)
Lerwick Boating Club
Shetland Isles, Scotland

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seadago
Posts: 103
Joined: Sun Jun 03, 2012 8:42 am
Location: Lowestoft, England

Re: Mainsheet attachment for 28 CK?

Post by seadago »

Hi Gerald! That's the downside of it. By now my cockpit is a bowl of spaghetti of lines!! Luckily, when I did the last refit, I installed a couple of extra clutches on the coachroof, that now come very handy.

At the moment I'm in Gijon, northern Spain. We crossed Biscay three days ago from Brest. The plan is to continue west and south via the Galician Rias, Porto, Lisbon, and then around to Gibraltar. After that, well, the weather will decide! 😁

Nausikaa has behaved well, all considering. Some hairy moments crossing the Channel, but overall a safe, dry, comfortable boat to be in. Let's see what the future brings around the Spanish Finisterre, and dealing with the Portuguese trades.

Try to get away friend. Best thing you could do I you have the time! Borders in continental EU are opening or open. Best of luck!!

Rafa
Rafael
s/v Nausikaa
SSR 30570, sail GBR 4619L
F30 CK (Hoyt), wishbones, centreboard, G10 rig. Built by Fairways Marine, Humble, UK, '82
Beta 16 hp with two-blade prop

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