CHOOSING THE CORRECT DOCK LINE
RECOMMENDED DOCK LINES FOR A GIVEN BOAT LENGTH
As a general rule, the length of bow and stern lines should equal half of your boat's overall length. Spring lines should be slightly longer, approximately two-thirds the length as your boat. Spring lines keep the boat snugly near the dock by preventing it from moving fore or aft, while allowing for the rise and fall of the tide.
Keep in mind; the position of the cleats on your boat and dock as they may affect the length of the dock line required. Always check if your boat cleats height and centre gap will accept the proposed dock line loop.
Unless your boat is unusually heavy or will be subjected to severe conditions, a bow line, stern line, and two spring lines are recommended. If your permanent slip has outboard pilings as well, you will need an additional bow and stern line.
In the case of cyclonic weather (constant winds above 50 knots), it is always recommended to double the amount of dock lines. That is 2 X bow, 2 X stern and 4 X springer. This is recommended over solely increasing the diameter of an existing dock line.
Whitsunday Discount Marine only recommends using either double braided, 3 strand nylon or 8 strand polyester for dock and mooring lines; the stretch characteristics absorb shock and will resist damaging cleats on your boat and on your dock.
Remember by increasing the diameter of a dock line, in turn reduce the wearing due to constant abrasion caused by the boats's movement in wind, tide and current.
Our nylon, poyester and polypropylene docking ropes are supplied with a 300mm loop spliced and whipped at one end. The majority of our docklines have an anti-chafing sleeve to prevent abrasion and marking the hull.
COMPARATIVE BREAKING & WORKING LOADS OF DOCK LINES
|Nylon Double Braided||Polyester 8 Braid|
|Rope Diameter||Breaking Load Kg||Working Load Kg||Breaking Load Kg||Working Load Kg|