Join Date: Jul 2002
Thanked 4 Times in 4 Posts
Rep Power: 15
rode rider idea
E31, this is IME quite a common technique and especially so with those boats that, to avoid bow heavy loading conditions, don''t carry a full chain rode on their #1 anchor. So...to depress the catenary and make the pull more horizontal to the seabed, one lowers the sentinel down the rode using a secondary line. This works in medium strength winds and becomes all but ineffective in higher winds, as the weight of the sentinel must be such that it''s easily handled by the crew (30#? 20#?) and that''s not enough to counter the windage of the boat.
In the Pacific with its deep anchorages, often the reverse logic is used and a buoy is attached to the rode. In light winds, little pull is felt by the anchor but, as the wind builds and the boat starts to set back on its rode, it must first submerge the buoy. Larger buoys provide more resistence, yet are no more difficult to carry, inflate and attach; it''s a clever alternative.
You can make your own sentinel easily by filling a 4" ID PVC pipe with dense, heavy material (e.g. old wheel weights from the local tire store) with one end cap drilled to accommodate a loop of line in the end.