MANOEUVRING TESTS WITH A FREE RUNNING TANKER MODEL

The main purpose of the project was to compare the manoeuvrability of a steering nozzle fitted with a steering fin with a common propeller/rudder arrangement. Particulars of the model, propeller/rudder- and steering nozzle arrangement are shown. A sketch of the model testing area is included: This report describes the completed manoeuvring tests and gives some conclusions regarding the comparison of the two steering alternatives: The turning ability of the steering nozzle propeller configuration is favourable. The turning ability of the rudder/propeller configuration decreases slightly at the lowest rpm used. The turning ability of the steering nozzle, however, decreases evidently with decreasing rpm. The course keeping ability of the rudder/propeller configuration is favourable. The course keeping ability of the steering nozzle decreases with decreasing rpm. In the case of rudder/propeller configuration, however, one gets a slight increase of the course keeping ability with decreasing rpm. The stopping tests show that the steering nozzle propeller gives the largest lateral deviation from the initial course. In loaded condition one gets the shortest distance run with the steering nozzle alternative. In ballasted condition, however, the propeller/rudder arrangement gives the shortest distance run. The acceleration ability of the two propulsive arrangements tested is about the same in loaded condition.

• Corporate Authors:

  Ship Research Institute of Norway

  P.O. Box 4125, Valentinlyst, Hakon Hakonsongt. 34
  N-7001 Trondheim,   Norway 
• Authors:
  • Ottesen, E K
• Publication Date: 1973-8

Media Info

• Features: References;
• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Maneuverability; Nozzles; Performance; Propellers; Propulsion; Rudders; Steerable propellers; Tests; Turning traffic; Very large crude carriers
• Old TRIS Terms: Course stability; Model testing; Propeller rudder interaction; Propulsion tests; Turning characteristics
• Subject Areas: Marine Transportation; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00167712
• Record Type: Publication
• Source Agency: Ship Research Institute of Norway
• Report/Paper Numbers: R-13.73
• Files: TRIS
• Created Date: Dec 27 1977 12:00AM