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Re: Anchor rode keeps wrapping around fin keel - can we prevent it?
Concrete makes a lousy weight.
The density of concrete is ~145 lbs./cu.ft.
So if you've got one cubic foot of concrete in a pail, your net weight in sea water is about 80 pounds. If you used lead instead of concrete, you'd have a 640# weight. The lead is 8x as dense as concrete (which is largely composed of water and turns to dust when dessicated) which also means that if you use a lead weight, it will be 8x smaller than the concrete for the same weight and performance.
Scrap lead can often be had from tire stores cheaply (used to be free, but the recyclers buy it form them now) and working with it is not difficult, as long as you remember the fumes can be toxic when you're melting it.