Title: Some unconventional propulsion arrangements
Abstract: This chapter describes some propulsion systems. Rudder propellers (slewable screw propellers)—with or without nozzles—are not just a derivative of the well-known outboarders for small boats. Outboarders can only slew the propeller by a limited angle to both sides, while rudder propellers can cover the full 360°. Slewing the propeller by 180° allows reversal of the thrust. The astern operation is much more efficient than for conventional propellers that turn in the reverse direction. By 1998, rudder propellers were available at ratings up to 4000 kW. If two Tpropellers are fitted, they can be made to overlap. As early as the 1880s, torpedo boats were fitted with overlapping propellers by M. Normand at a French shipyard. The propellers turned in the same direction while partially regaining rotational energy. In the 1970s, model tests in Germany covered only cases for oppositely turning propellers. Better results were obtained for propellers that turned outside on the topside. Overlapping propellers have rarely been used in practice, although the theory has been extensively investigated in model tests.
Publication Year: 1998
Publication Date: 1998-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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