High speed can be achieved by high powered engines, but the successful operation of a high-speed craft is dependent on the ability to design a lightweight craft with medium power levels and the optimisation of the hull for best performance as well as optimisation of the operation and management of the craft. Exhaust emissions from ships, particularly CO_2 emissions, are coming under very close scrutiny from IMO and other Organisations and efficiency indices are being proposed indicating the comparative performance of certain ship types. The exhaust emissions performance of typical high-speed RoPax and passenger ferries has been analysed and is presented in comparison with conventional ferries, as well as against other forms of transport. The advantages of lightweight designs are also discussed.
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