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125 Discussion Forum
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Return to the Forum List  Chain plate supports allowed? Spare masts in Sydney? |  Hello all, I'm new to 125's and need some advice on the measurement rules.
I have an older timber 125 (2417 Ariel) that has a of problem when sailing. It won't hold rig tension as the sides of the boat bend toward each other when the chain plates are loaded.
Am I allowed within the rules to glue a triangular support made of 9mm plywood inside the hull running up the side of the hull at the chain plate and across the top of the bouyancy tank to its inner edge, following the line from the chain plate to the mast step?
I tried to upload a jpeg photo of a cardboard cutout where I propose to put the plywood support, but I'm not sure it's working.
I could also use a 2nd hand mast if anybody in Sydney has one.
Thanks, Goughy
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| | Re: Chain plate supports allowed? Spare masts in Sydney? | Your problem is not unusual. The early hulls had the chainplates mounted on the gunwhale, and whilst the glue joint of the gunwhales & coamings was strong it would be OK. The timbers have possibly delaminated from each other and should be separated and epoxy glue pushed into the gaps.
For many years we have been running the chainplates from the deck level where there is adaquate side support. By the rules they are to be attached to the chainplate packing. You may need to glue a piece of timber inside the tanks to spread the load and bolt right through the hull outer plywood. Ensure the hole where they pass through the deck is well sealed with epoxy glue to avoid water ingress.
The Rules can be downloaded from this website as a .pdf document Go to information on 125s/downloads etc.
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| | Re: Chain plate supports allowed? Spare masts in Sydney? | Further to my response above. You may find this solution easier.
Bolt a 1/4" saddle as low down on the chainplate packing piece as possible. Have the holes in line with the sidestay pull, not at right angles. To reduce the compression into the timber use a stainless backing piece (large diameter 1/4" washers will do).
The saddle with the ring in the centre is stronger RF1057.
Do not use 3/16" as they are not strong enough.
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| | Re: Chain plate supports allowed? Spare masts in Sydney? | Awesome thanks Don, I had read the rules and thought I'd better ask before I started chopping things up! I'll take up your second suggestion, that will be stronger and neater than what I was proposing, and thanks for the tip on the 1/4 inch saddles too. The gunwhales haven't separated from the hull, but the boat is soft around that area.
I would like to glue a semi-circular piece of 6mm gaboon ply (radius 100mm) flat on the deck adjacent to the saddle to help spread the load through the deck, as I don't know what reinforcing is inside the tank at that point (none I suspect, as it wasn't built with this set up in mind). Do you think that would be ok?
While I'm asking one thousand questions, where is the best place to have the mast step? As far foward or as far back as possible, or somewhere in between? Or doesn't it matter? The timber under the mast step was collapsing and taking the bulkhead with it, so I had to remove it and get into the front tank and reinforce it with western red cedar from the king plank to the keel. I could put the mast back where it was but I thought I'd see what the current thinking is first.
Thanks again, James
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| | Re: Chain plate supports allowed? Spare masts in Sydney? | Your hull has probably got inspection hatches in the side tanks. Hopefully you can get access under the deck/chainplate area. This would be the place to glue your deck side load reinforcement. Hold it in place with push sticks against the bottom inside of the hull whilst your epoxy glue dries.
To put the "pad" on the top of the deck may raise a few eyebrows.
Mast - the trend is as far back as practical.
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