Dagger board modification

  • pugwash
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10 Sep 2007 12:36 #20086 by pugwash
Dagger board modification was created by pugwash
I recently read with interest about a chap who modified his Mirror for cruising, putting a storage hatch for light items under the fordeck. After being caught out a couple of times by the falling tide at Abersoch and nearly standing our poor little "Piglet" on her nose on sand bars I have started thinking along the lines of modifying the dagger board into a swinging centreboard. The practicalities of doing it are not a problem because I trained as a joiner in my younger years, so have the tools and the where with all. I also understand that a modification like that will take her out of class, but as she is almost a family pet and is ideal for myself and my wife to move around the beach, I do not envisage selling her on. Are there any more experienced Mirror Repairers/Modifiers out there who can give me any advice or observations on the idea.

Cheers

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  • Roger Clark
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10 Sep 2007 16:07 #15604 by Roger Clark
Replied by Roger Clark on topic Dagger board modification
I am not a modern Mirror builder, but I would be very apprehensive in making a change as substantial as this. The hull form is held under tension whilst being built and splitting the centre seam will cause the hull to loose shape, possibly weakening it too much that the panels will become weak enough to break.

If you were to try doing this then I would create a pair of beams that would run either side of the centre seam for the full length of the cockpit well. It would probably be best to laminate these in place using an epoxy resin. You must do this before cutting the centre seam. Then build a new centre plate box that uses these beams for support. Then and only then would I cut into the hull.

You would need to plan the modification very carefully. I would suggest using the class rules to help drawn up some plans before you start work.( http://www.sailing.org/classes/ClassRul ... 310707.pdf )
I would try and make the centre plate the same size when fully dropped as it is now.

The big draw back to your project is that you will loose a lot of space in the cockpit well. The effort involved in this change may not be successful and you will have ruined you Mirror. My best advice would be either leave the Mirror as it is or buy a different dinghy with a swing centre plate.

Roger
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  • pugwash
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10 Sep 2007 21:27 #15605 by pugwash
Replied by pugwash on topic Dagger board modification
Thanks for that Roger. That was just the sort of thing I was after. It's helped to highlight my ignorance of the Mirror's structure. I will take your advice and look carefully at the job. Then try and get hold of a scrap Mirror to experiment on before attacking the "family pet" !!! I might document the project (if it ever gets off the ground) and post the results. Much appreciated mate.

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11 Sep 2007 21:05 #15610 by Paul Hansen
Whilst it may be possible I agree with Roger that cost and work may be prohibitive. If you really wish to try it look at a Miracle, this is a larger boat than the Mirror with a centreboard, as Roger says the case goes much further aft.

One answer may be a cheap Miracle and keep the Mirror for deeper water. Your family pet will be worth more in original condition <img src=icon_smile_approve.gif border=0 align=middle>

Cheers
Paul <img src=icon_smile.gif border=0 align=middle>

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  • D Hughes
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11 Sep 2007 22:03 #15611 by D Hughes
Replied by D Hughes on topic Dagger board modification
I think a Heron is the best boat to look at, as it's a similar size.
It has a set up similar to a GP14 but smaller. You may be able to buy the parts as a kit from a listed heron builder (checkout their class website).

DH

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  • pugwash
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12 Sep 2007 11:39 #15612 by pugwash
Replied by pugwash on topic Dagger board modification
Thanks to DH and Paul as well. Yes I have looked at both the Miracle and the Heron as alternatives. It was the Miracle that gave me the idea in the first place. I actually learned to sail in a GP14, so the Heron is an attractive option. At present because cashflow is an issue another boat is not on the immediate cards, so I will just have to sail in more carefully on a falling tide, and possibly keelhaul the crew each time we run aground..!!!!!

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13 Sep 2007 00:57 #15616 by Paul Hansen
Hi Pugwash

If you ever feel the urge to try a centreboard you could contact Dave Butler http://www.butlerboats.biz/index.htm

He builds Herons and also built an excellent wooden Mirror for us, therefore may be able to give you some expert advice on the feasability of the project.

Cheers
Paul

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  • pugwash
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13 Sep 2007 12:25 #15619 by pugwash
Replied by pugwash on topic Dagger board modification
Cheers Paul I will keep that in mind. I think that the next step for me is to get hold of an old scrap Mirror hull that is due for the Big Boatyard in the Sky and mess with that. I live in Harrogate so if anybody in the general area, Leeds Bradford etc. knows of a hull like that I would be willing to pick it up. Clubs tend to get rid of them if they are beyond repair and are cluttering up the dinghy park.

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  • Roger Clark
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13 Sep 2007 13:02 #15620 by Roger Clark
Replied by Roger Clark on topic Dagger board modification
Keep an eye on ebay as damaged ones always are being listed. The following link will give you all the Mirrors and Mirror bits for sale at any time.

http://sports.search.ebay.co.uk/mirror_ ... QQsbrsrtZd

Roger
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