I purchased two anchors for my Catalina 22 based on research from "Practical Sailor" and Fortress Anchors. It seems that fluke anchors set best in mud and sand, and plow anchors in harder stuff: I ended up with a 7.5 kg Bruce and a Fortress FX-11 (7 lbs) which are recommended for boats weighing 3x as much. The Bruce supposedly will re-set itself if a tidal flood or wind reversal shifts the boat 180 in the night. This after reading alot of accounts of dragged anchors from either being inappropriate or undersized. I also calculated a 3x safety factor on the rode components for wind force on a C-22 at 42 knots (800 lbs), and that included the strength of wet nylon vs dry (-15%), and the type of knot used to connect the rode. For what it''s worth.