YM Article
The YM article mentioned by Kjell was most illuminating but the only bottom used in the test was hard sand. In this several anchors failed to set at all and this left doubt that the very large & very powerful test vessel was not moving slowly enough, or did not wait for long enough, to enable the flukes to penetrate. It may even have been a "crusty" bottom.Further study (Google Anchoring) has revealed many other articles, two from the US authorities are of particular interest. One says holding power in mud is greater than that in sand. The other shows exactly the opposite.A UK sailing mag tested all types and, surprisingly, concluded that the larger and heavier version of one pattern held better than the smaller version, thus illustrating that, at best, anchoring is a hit and miss affair.The UK lifeboat service tested all types for use on their own lifeboats and were in difficulty in reaching a conclusion. It is reported that then a gale sprang up and they happened to be using the Delta. It held perfectly so they now use Deltas.I understand that the Danforth pattern (Fortress) is best in mud or soft sand whereas the plough types hold well in these bottoms but excel in other types. Neither penetrates kelp very well.I suggest you get the largest anchor you can handle/stow and preferably one which fits neatly on your bow fitting - then carry a spare of a different pattern as a backup/kedge. An aluminium anchor might not have the weight to start its flukes digging into hard sand. Suggest you ask others who sail in your locality.PS:- I use a 16Kg Delta on my Legend 376 but I would like larger in some soft bottoms.PPS:- Nylon chain hook? Mine is SS.