Centaur boom casting

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Belathesailor
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Centaur boom casting

Post by Belathesailor » Tue Mar 27, 2018 11:39 am

The aluminium casting at the cockpit end of the boom which takes the topping lift shackle and the main sheet shackle is severely worn - on the main sheet side. I should like to replace it, otherwise I fear it will fail when it is least convenient.

Any suggestions please I attach a photo of the casting.
Westerly Boom casting.jpg
Westerly Boom casting.jpg (215.89KiB)Viewed 879 times

30wn78
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Re: Centaur boom casting

Post by 30wn78 » Tue Mar 27, 2018 9:48 pm

Hi,

I have a similar issue which I am resolving this month.

I have some spare 'thick' stainless plate that is around the same size, just pondering on how to shape it.

If I remember to take some picks I will forward them on.\

KR

Mike
Safety factor of 3 please.

Jolly Roger
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Re: Centaur boom casting

Post by Jolly Roger » Tue Mar 27, 2018 11:49 pm

Looking at the fitting in the photo, why not change to fixings over. The mainsheet has a larger loading than the topping lift. This would increase your safety limit by having the worn side with the lighter load.
30wn78 wrote:
Tue Mar 27, 2018 9:48 pm
I have some spare 'thick' stainless plate that is around the same size, just pondering on how to shape it.
This sounds a good idea but I would be concerned about electrolysis between the alloy and stainless, with the alloy suffering corrosion. You could use a piece of Tufnol instead, as it is corrosion resistant, strong and relatively easy to shape.
Roger
Concerto Fulmar FR38
Photos at http://s1294.photobucket.com/user/Conce ... 2/library/

Belathesailor
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Re: Centaur boom casting

Post by Belathesailor » Wed Mar 28, 2018 7:14 pm

Well thank you both. I had thought of just turning the casting over - but it is seized solid. If I whacked it I reckon I would smash the casting.

I think the chunk of stainless steel might be the answer but I note what you say about electrolisis. I think I would saw through the casting (without damaging the spindle) and bodge it with a s/s fitting - and keep a very close eye on it.

Forgive my ignorance Jolly Roger, but what is tufnol?

Jolly Roger
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Re: Centaur boom casting

Post by Jolly Roger » Wed Mar 28, 2018 11:32 pm

Tufnol has been used in yacht fittings since definitely the 1960's. The link will explain it fully for you, but I feel it would be your best material.
http://ahistoryoftufnol.org/whatistufnol/

If you follow this Google link, you will find a number of suppliers.
https://www.google.co.uk/search?source= ... ttPGo0n_sA

Hope this helps you and and other owners.
Roger
Concerto Fulmar FR38
Photos at http://s1294.photobucket.com/user/Conce ... 2/library/

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