A Hysucat tandem foil system (rearfoil over full tunnel width) was designed by Prof. Hoppe for the catamaran ferry “Sea Princess” of Mr. Girdlestone of Cape Town. The hulls were designed by Bob Van Niekerk on the basis of the former 20m T-Craft. Towing Tank model tests were conducted with various different foil systems but the tandem foil system gave the best result for this heavily loaded low powered craft. The craft displaces over 60 t with 120 passengers aboard and reached 32 knots with the 2 * 1000 kW MTU Diesels and the inclined shaft propeller systems by Teignbridge Propellers U.K. The ferry operates in sight-seeing tours around Cape Town.