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post #1 of 4 Old 05-06-2019 Thread Starter
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Allmand 31 keel cement?

Hello everyone. I joined this forum a couple of years ago, I have a 1982 C&C MKII which I’m currently selling because I’ve just bought a 1981 Allmand 31which needs a little bit of love. I am concerned about the keel. I have read they are iron, but a good chunk is missing and it definitely looks like cement? Also there is moisture dripping😳 I will enclose a pic. Thanks for your advice/thoughts.
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post #2 of 4 Old 05-07-2019
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Re: Allmand 31 keel cement?

If the ballast is internal it was not unknown to cover the ballast with cement and even mix steel punchings with concrete. Typically this was done on wooden boats but also on fiberglass especially amateur finished hulls. Not my idea of the best way to build a boat but works.
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post #3 of 4 Old 05-07-2019
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Re: Allmand 31 keel cement?

Like many of the internal ballasted boat builders of that era, Allmand used a mix of concrete and a ballast material for their keels. If your boat has the short rig, most likely the ballast is iron pigs and steel boiler punchings in concrete. Allmand offered a tall rig and if you selected the tall rig there was an optional lead keel that went along with it. My recollection is that the ballast in the lead keel version was lead shot mixed in polyester resin. If your keel appears to be cement, that probably means that it is the iron ballasted-short rig version of the boat.

Iron ballast in concrete is about the worst form of ballast that is out there. Ignoring that it is very low densiity, sooner or later water can get to the iron and start to rust it. Over time you end up with a bilge full of broken up concrete that has iron in it making it harder to remove.

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post #4 of 4 Old 05-07-2019 Thread Starter
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Re: Allmand 31 keel cement?

Thanks guys for your reply, that doesnt sound like it will be an easy job!
I drilled a small hole up into the keel, water is coming out of it, it is not rusty but whitish from the cement I gather. Lets see what happens. Watch this space or not! yikes!
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