Great conditions in the Straits. +

[kidsdream]

I realize I'm a bit late to this discussion. But why aren't boats simply dropping an anchor near the wreck rather than tieing directly to it? I realize that the "lunch hook" most boats carry is useless for real anchoring (sorry, I'm a cruising sailor and serious about ground tackle) but it should be good enouch for a couple hours in relatively calm water. Is there something I'm missing?

Unless you anchored a couple hundred feet from the wreck (so that your actual drop did not hit the wreck or to eliminate the risk that the scope of the anchor rode does not get tangled in the wreck if the wind changed direction) the wreck would actually be at a greater risk.

Also you would need about 500 feet of line on a 90' wreck give or take. This is based on the angle of the line/anchor to the bottom to prevent the anchor to break loose. When you are tied in you only need about 1.5 time the depth to be effective.

Boating class is over.

 

[Flightlead]

don't need a boating class thanks. have 6 pack. :no

perhaps need class in tieing to a wreck though never done it.

familiar with the concept of scope. 5:1 is typically what I would use for say a temporary anchorage when people are remaining on board and during daylight. typically use 7:1 when leaving the boat unless a very tight and well protected anchorage and/or bahamian moored. even then its all 5/8" chain with a nylon snubber. oh, I think "catenary" is the word you were looking for.

I can see the risk of dropping the anchor onto the wreck or as you mention the entanglement issue if the vessel swings. I assume that the captain knows the wreck position well, given that they are sending a diver down with a line to it. so why not drop short as you say. entanglement is a bigger issue, could be overcome with a med moor type anchoring, but that raises other issues. guess the real solultion is permanent mooring near the wreck.

I suppose when tying in a diver is going down line in hand when the vessel is held stationary under power? I guess its a bit more difficult to do that with a 50lb Bruce in hand.

Unless you anchored a couple hundred feet from the wreck (so that your actual drop did not hit the wreck or to eliminate the risk that the scope of the anchor rode does not get tangled in the wreck if the wind changed direction) the wreck would actually be at a greater risk.

Also you would need about 500 feet of line on a 90' wreck give or take. This is based on the angle of the line/anchor to the bottom to prevent the anchor to break loose. When you are tied in you only need about 1.5 time the depth to be effective.

Boating class is over.

 

[kidsdream]

The other issue with anchoring "near" the wreck is finding it. Even if the vis. is good and in the 50' to 70' range there is the issue of finding the wreck and then getting back to the mooring (of course one could run a line with a reel.

One of the typical ways to tie-in (and minimize damage to the wreck) is to drop the line with a jug/float attached (hook on the tie-in end). Then the first diver drops in and takes the line and hand ties in the the wreck. Then he signals the boat by yanking the line/float.

The boat then ties inton the line near the float.

don't need a boating class thanks. have 6 pack. :no

perhaps need class in tieing to a wreck though never done it.

familiar with the concept of scope. 5:1 is typically what I would use for say a temporary anchorage when people are remaining on board and during daylight. typically use 7:1 when leaving the boat unless a very tight and well protected anchorage and/or bahamian moored. even then its all 5/8" chain with a nylon snubber. oh, I think "catenary" is the word you were looking for.

I can see the risk of dropping the anchor onto the wreck or as you mention the entanglement issue if the vessel swings. I assume that the captain knows the wreck position well, given that they are sending a diver down with a line to it. so why not drop short as you say. entanglement is a bigger issue, could be overcome with a med moor type anchoring, but that raises other issues. guess the real solultion is permanent mooring near the wreck.

I suppose when tying in a diver is going down line in hand when the vessel is held stationary under power? I guess its a bit more difficult to do that with a 50lb Bruce in hand.