Experimental Study on the Holding Ability of Anchors for Small Vessels

Abstract

The holding ability of two types of anchor was investigated in terms of physical properties of seabed. Experiments were performed using two stockless type anchors (VDR type, VDH type). These anchors were pulled using the Research Vessel, DAINI-HOKUTO(19t). The tension force was measured using a Ioadcell connected to the towing rope. Sand content was chosen as an index property, and was correlated to the holding ability. The experimental results indicated that the VDR type-stockless showed highest resistance against pulling for sandy and clayey soils and sandy clay soils. The VDR type-stockless anchor can be used for anchoring of small vessels less than 20 tons.