Crystal Blues displaces just under 20 metric tons, and I always wondered how our new Rocna 33kg anchor behaved - in soft mud I know it buries deep, but in hard sand with grass just how deep does it bury? The shallow waters here in the Bahamas let me see the answer a few days ago - after 20 hours with 20 knots of wind blowing here at Tilloo Cay.
The answer it seems is not very deep, but we've never dragged, even in sustained winds over 30 knots, gusting to 40 knots. The bottom here is really tough, and once you get the point buried it seems to hold well. In this image the load on the flukes is asymmetric, evidence (I think) of the anchor rotating in the sand as the wind veered through 45 degrees, though I'd welcome comments from others on this.