Hi Ben, welcome.
I have done a lot of anchor research. 10 Kg Rocna is good choice. Mine has never dragged (touch wood). What I have found out is the effect of chain is less than historically claimed “catenerary” only exists a low pulls. Once wind gets to 20kt even a full chain anchor rode becomes a straight rod. Strong but no lowering of pull angles. The most recent theory is go with bigger anchor rather than more chain. Chain becomes chafe protection so only need 20-30 feet. I seldom anchor in more than 30 feet of water. With 150’ total rode that would give scope 150/35(depth+freeboard)= about 4:1 ample for most secure anchorages but not sufficient for exposed conditions requiring 5:1 or even 7:1. My suggestion would be keep Rocna and 30’ chain but look to increase nylon rode.
Check out presentation “Anchoring.ppt” Presentations
Still thinking about replacing lifelines with dyneema.
Congrats Ben! Welcome to Burrard Civic – We’ve been mooring there for 6 years. Several memebers also been there – right now I think it’s just Godi and us (MacJager)
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