I bought one of these cheap anchors (some metal covered with plastic) for 25 bucks but I was not satisfied with the result as the anchor was dragging in the sand at the bottom until someone told me the trick:
- The rope needs to be twice as long as your ski.
- Actually, chain is better and rope must be sinking rope.
Here's what I did: I removed the cheap rope from the anchor and bought 6 feet of chain (medium size, not too small, not too big). I attached the chain to the anchor using a chain link (the kind that you can screw/unscrew to install/remove). Then I bought six more feet of sinking marine rope and attached it to the end of the chain.
I now have an anchor and chain at the bottom the the lake and the chain makes all the difference because it prevents the anchor of being drag by the floating rope. Unless there are strong sustained winds or lots of wake from wake boats, it never drifts anymore and my ski is never beached anymore.
Benji.