Diminutive but amazingly powerful, the Rotortug is capable of manoeuvring a 1,000ft-long 250,000-ton bulk carrier in and out of harbour. Thanks to its revolutionary propulsion system the Rotortug is blessed with spectacular agility, a high rate of turn, and the ability to move rapidly sideways and exert a high proportion of its 75-tonne bollard pull in any direction. Published with the full cooperation of Rotortug BV, originators of the Rotortug, author M.J. (Jack) Gaston gives unique insights into the design, build and operation of this revolutionary vessel.