PROPELLERS, RUDDERS, AND MANOEUVRING DEVICES

Objectives in the hydrodynamic design of ships have undergone changes of emphasis in the last decade or so, largely because of the increased incidence of propeller-excited vibration. More attention is now being given to ship design and performance from the point of view of propulsion dynamics and associated factors such as the inflow to the propeller, the shape of the stern, and the presence of the rudder. After briefly discussing these aspects of hydrodynamic design in general terms, the Author, of the National Maritime Institute, considers the propeller/rudder and the propeller/hull combinations in more detail. Among the matters examined are; propeller loading; effects of the rudder on propulsive efficiency; rudder forces and pressures on the hull; rudder stalling; possibilities of increasing rudder movement to 60 or 70 deg. in each direction (instead of the usual plus or minus 35 deg.) to improve manoeuvring and ship-handling at low and zero ship-speeds; the propeller, wake, and non-uniform flow to the blades; and propeller cavitation and associated problems, including vibration. The paper includes general discussions on controllable-pitch propellers (including a consideration of spindle torque), ducted propellers (including brief discussion on tip clearance, rudder location in relation to the duct on VLCCs, and steerable ducted propellers), auxiliary manoeuvring devices (including tunnel and azimuthing thrusters), and rotating-cylinder rudders and other means of enabling large rudder-angles to be used. Order from: BSRA as No. 47,695.

• Supplemental Notes:
  • Conference on Shipbuilding, held in Plymouth, November 1977.
• Corporate Authors:

  Nautical Institute

  Alderman's House, Alderman's Walk
  London EC2M 3UU,   England 
• Authors:
  • English, J W
• Publication Date: 1977

Media Info

• Features: References;
• Pagination: 22 p.

Subject/Index Terms

• TRT Terms: Cavitation (Mechanics); Cavitation erosion; Controllable pitch propellers; Ducted propellers; Force; Hulls; Hydrodynamics; Maneuvering; Mechanical loads; Performance; Propellers; Rudders; Ship pilotage; Ships; Steerable propellers; Thrusters; Vehicle design; Vibration
• Uncontrolled Terms: Ship design
• Old TRIS Terms: Hull forces; Hull propeller interaction; Propeller induced vibration; Propeller loading; Rudder forces
• Subject Areas: Design; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00173657
• Record Type: Publication
• Source Agency: British Ship Research Association
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Apr 26 1978 12:00AM