Abstract
This paper deals with the high-capacity gravity-type self-discharging vessel which has become the dominant means for handling dry bulk cargoes on the Great Lakes of North America. Other forms of self-unloading vessels, such as the geared bulker with its deck-mounted grabs and the specialized carriers for products such as bulk cement, are not discussed since they are capable of only low discharge rates. The purpose of this paper is to provide the reader with an update in the design of the self-unloader since 1969. The period between 1969 and 1976 has seen many changes in the unloading equipment aboard these vessels, and the self-unloading fleet has grown to become the common means of transporting bulk on the Lakes. In addition, these vessels are growing in their importance in the St. Lawrence traffic, as well as in some deep-sea trade route areas.
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