There are lots of things to consider in an anchor - and you haven't given us
any idea of what it is you are trying to anchor, where, or under what
conditions. But to look at just one consideration. If you made a 1000 kg
anchor out of something with a density of say 2.0 ( mix of rubber and
concrete.), it would take a force of 500 kg to lift it vertically up. If
you made it out of something with a density of 5.0 ( mix of steel and
concrete ) it would need a force of 800 kg to lift it vertically up.
Obviously boats don't usually try to lift anchors vertically up, they roll,
slide, dig into mud, get undermined by current ......... So the
statement that mass alone does not make a good anchor is very much an
understatement.

DF




"Julien Mills" wrote in message
...
Richard J Kinch wrote:

Julien Mills writes:


Doesn't cement leach out or something under water?


Leach out what? Limestone? So what?

If it doesn't matter then I'm OK with that.
Thanks.

Mass alone does not make a good anchor.

I know, are you talking about cement here?
Not quite sure you are meaning.