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Does fibreglass like melted lead?

Old 02-04-2008, 01:41 PM
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androot
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Default Does fibreglass like melted lead?

Hi there, i'm just going to put ballast into the hull but i'm not sure if i can do it with a liquid lead, even with the hull immersed in icy water. Has anybody ever done that?
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Old 02-04-2008, 02:25 PM
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Default RE: Does fibreglass like melted lead?

No, fiberglass doesn't 'like' melted lead. Melted lead also does not like moisture of any kind, much less water, hot or cold. I would be very careful with that cooling scheme, you won't much care for melted lead either, if you have to wear it, or the hot water from a splash.
- 'Doc
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Old 02-04-2008, 02:48 PM
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Default RE: Does fibreglass like melted lead?

I would not do that... I tried once and it cracked my hull. For what boat is this for? If its for a US 12 or similar which comes with a full keel, you can get a pre-cut ballast for it.
Steve
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Old 02-05-2008, 07:21 AM
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Default RE: Does fibreglass like melted lead?

Much safer to make a plaster plug using the fin as a mould, then use that as male plug to make a mould for the lead. As said above, lead molten lead will indicate any moisture in the most spectacular way, and you dont want to be there wen it does. Cooling water on the outside is not a problem - they make lead shot by dropping molten lead into water, but moisture inside the mould will turn instantly into superheated steam when the molten lead hits it. The thermal shock to the fibreglass is unpredictable.
Any plaster mould for lead needs to be perfectly dry, and preferably warm. Some time in an oven works well.
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Old 02-05-2008, 10:19 AM
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Default RE: Does fibreglass like melted lead?

I always used fine lead shot, #8 or #9, poured into the keel and then covered with epoxy.
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Old 02-11-2008, 02:07 PM
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androot
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Default RE: Does fibreglass like melted lead?

Hello again, sailers. As i had the sheet of lead i was going to cut it into small bits and pour the epoxy afterwards but after some thinking i did not like the fact of having more lead going up the hull, just wanted to concetrate as much lead as possible as close to the bottom as possible;-I so as i was cutting the lead into small bits i decided to have a go. Being stupidly stubborn polish bloke i had to try.... and i DID IT!!! Absolutely nothing happen to the hull. It was immersed in homemade tank of water. The operation, as you can imagine, took me looooong time, around 5 hrs. I was melting it bit by bit, something like 100 grams every round. I lost my count after 5. At the end the hull weights about 3 kilos. I left some "weight room" for other stuff like servos and battery. Sorry for being bad boy disobeying experienced builders.

Regards

Andy
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Old 02-17-2008, 05:35 PM
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Default RE: Does fibreglass like melted lead?

I'm not sure if you have solved your problem or not about pouring into a fiberglass hull. I know the EC12 guys do this, with their EC's as I've seen many pics of the process. They usually immerse the hull in snow or ice, again it isn't a process to be clumsey with, as pointed out you are working with a very hot substance and any combination of it and water will not be good. If a plug of somesort could be made that is the way to go. I've made plugs and then poured a mold using a product that is used for making decorative stones. I can get the name if you like. Nice thing abou tthat process is that you are then left with a means to replicate your creation for others. Hope this helps.

Chalie
OKC,OK
Sooner State Model Yacht Club
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Old 04-09-2008, 02:06 PM
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Default RE: Does fibreglass like melted lead?

i have done it many times on an EC-12 hull. have someone push the hull down in std. room temp water as you pour. keep i there till the lead cools (3-4 min.) and it works great. the only way to get the lead as compact as possible. ( and you can hide a nugget of tungsten in there if you desire)
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Old 04-09-2008, 03:44 PM
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Default RE: Does fibreglass like melted lead?

Kirk,
Are you still sailing EC's? We have 5 here in OKlahoma City, our hope is to get a regional running again for the Class.

Charlie
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Old 04-09-2008, 04:33 PM
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Default RE: Does fibreglass like melted lead?

nope.
the EC12 died off big time here in Houston, a few years back we had 15 or so boats racing once a month. i guess the most intrest around here lately is the AC class.
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