Join Date: Aug 2002
Location: Gloucester, Mass. USA
Thanked 1 Time in 1 Post
Rep Power: 13
First of all, even the larger standard anchors are not constructed to last for extended periods under water.
I’d be willing to bet that if you got a 55 gallon drum and took it down to a cement mixing company, they could put around 500 lbs. (dry weight) of foundation mix in it pretty cheep. Otherwise, you’ll need to use mortar mix and extra portland cement to mix your self a batch that will hold up under water. Either way, you’ll need the drum and lots of re-bar to stick through the links of the chain to hold it in the cement. I’d use 4 feet of at least 1-inch chain for this. You can put a couple of cement blocks, holes up, in the barrel to hold the re-bar level and the chain centered during the pour. Be sure to take a stick and work out any air gaps. This will need to sit for a week or so to thoroughly cure before it goes in the water.
Next step is to get it onto a pick-up truck and down to a launching ramp. Roll it off the back and attach the rest of the gear. I hope you have enough tide for this next step but if not, where there’s a will, there’s a way. A good stout skiff will easily handle the weight. Lash the block around the girth of the skiff with a sacrificial piece of ½-inch nylon and let the tide come up and float it off. If you don’t have much tide in your area, it may require a bit of swimming, pushing and cursing to get the thing hanging under the skiff but, it can be done!
I would recommend towing the skiff out to the mooring spot instead of riding in it because it may be safer to cut the line from a different boat.
My “rule-of-thumb” for the chain is to use at least ¾-inch bottom chain and ½-inch top chain regardless of boat size below say, 45 feet. It’s not the tinsel strength that’s important here but the ability of the chain to hold up against the corrosive action of the water. The shackles are the size of the larger chain in the connection. The length of the bottom chain is equal to the water depth at low tide and the top chain length is equal to the depth at high tide. I advocate using a “pass-through” style mooring ball and if you do this, add 1-foot of chain. Then come the rubber bumpers placed on top of the ball so the top shackle doesn’t damage it, and the top shackle is the largest one that will fit. Through the top shackle is the swivel and then my pennants to that. Good luck!