Page "Anchor" Paragraph 62

Lowering a concentrated, heavy weight down the anchor line – rope or chain – directly in front of the bow to the seabed, behaves like a heavy chain rode and lowers the angle of pull on the anchor.

If the weight is suspended off the seabed it acts as a spring or shock absorber to dampen the sudden actions that are normally transmitted to the anchor and can cause it to dislodge and drag.

In light conditions, a kellet will reduce the swing of the vessel considerably.

In heavier conditions these effects disappear as the rode becomes straightened and the weight ineffective.

Known as a " anchor chum weight " or " angel " in the UK.