"Most cruising yachts spend at least 80% of the time at anchor."
LINK
http://alain.fraysse.free.fr/sail/rode/rode.htm
Forces
Anchoring Tackle
Anchor
Rode - Static Behavior
Rode - Dynamic Behavior
Accessories
Synthesis
"Note 2: If you feel allergic to formulae, tables, curves etc., you
may skip them and directly go to the conclusions of each section!"
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Alot of this is rather hi-tec but there are diagrams and good
descriptions.
Mic67