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The purpose of this study is to investigate the resistance and seakeeping performance of high-speed multi-hull vessels. Three catamaran and one trimaran variant were evaluated. Parameters such as the transom depth and the separation between the demi-hulls were varied to determine the effects on the calm water wave resistance and seakeeping performance in head seas. The calculations were performed using the time-domain Rankine panel method, SWAN-2. The effects of high aspect ratio foils/winglets attached to the multi-hull designs were also investigated. In particular, the heave and pitch motions in head waves were reevaluated including the effects caused by the presence of such appendages. Foils and winglets were placed in various longitudinal locations on the hulls of both the catamarans and the trimaran. The resulting heave and pith RAOs were evaluated for various high Froude numbers