The problem with concrete blocks is that they are far less dense than an steel mushroom anchor or cast iron engine block—so the effective weight they represent is far less, given the same mass. Also, a mushroom anchor, will tend to be fairly effective, more so than its actual mass would indicated, as it becomes buried in the bottom over time. Concrete blocks may not bury themselves as effectively, nor may an engine block, which presents a much larger surface area to the bottom than the much more compact mushroom anchor does.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.