Optimum 'chum' weight

[Guest]

Optimum \'chum\' weight

My boat,a Searover 28,triple keels,displacement 4 tons is tied up alongside a harbour wall that dries out.As the bow and stern lines have to allow for the tidal range she tends to drift away from the wall.
I'm going to put some weights (chums?) on the lines to keep her nicely alongside but I'm afraid that if the chums are too heavy then the fenders will ride up as the tide drops.
Is there an optimum weight that I should put onto each line?

 

[gus]

Re: Optimum \'chum\' weight

The amount of weight required will depend on the set up of your ropes. The greater the angle that your ropes are to the line of the quay, the less weight you will need because the angle of the ropes will be already pulling the boat in. If your ropes are long, then again a lighter weight will still be effective. Thus the amount of relative weight required is really by experimenting. Use adjustable temporary weights until you are satisfied that they are having the desired effect. One kilo may be enough or it may require 5 kilos. Try it and see.

 

[vyv_cox]

Re: Optimum \'chum\' weight

We once spent a week in Douglas, IOM, before the sill was built. Drying every tide in a fresh easterly that blew us off the wall. I found that my diving weight belt, 16 lbs, on one warp was sufficient to hold us against the wall at almost any state of wind or tide. We had no fender problems. 34 ft boat, 7 tons.