An investigation of fuel efficiency in high speed vessels by using interceptors

01/24/2017 - 15:00-01/24/2017 - 17:00


(Istanbul Technical University)
Baris Barlas
(Istanbul Technical University)
(World Maritime University)


In the initial step in ship design, it is helpful to perform preliminary design and analysis on many ship configurations. One of the most important analysis is power prediction analysis. To be more efficient in powering, hydrodynamic optimisation by using energy saving devices is growing field of interest in many areas of ship design. To calculate the propulsion power for a vessel, the resistance have to be determined with the highest possible accuracy.  It is of practical importance to include sinkage and trim effects in calculation of the wetted surface and so calculation of the ship resistance for high speed marine vessels.

Interceptors have been widely used in recent years in fast passenger ferries, high speed motor yachts, sailing yachts, high speed fishing vessels, and military crafts. The main reason for using interceptors are for ride and trim control, and also for steering. By controlling trim during the voyage, a remarkable water resistance reduction can be achieved. The drag reduction vary by speed and by vessel type. In this study the results of preliminary experiments made in Istanbul Technical University’s Towing Tank is given. Preliminary experimental results revealed a noticeable reduction in water resistance over a broad speed range, with benefits of 1.5 % to 11% in the model speed range between 2.5 m/s and 5.25 m/s. The trim reduction observed are 1.6o and 4.7o in the model speed range between 2.5 m/s and 5.25 m/s. The improvements observed are much larger in higher speeds.