Page 260 - Ship Construction.DJ Eyres 6Ed

Ch21-H8070.fm Page 249 Wednesday, October 18, 2006 6:59 AM
Aft End Structure 249
Various podded propulsor arrangements are installed, a smaller vessel
may have a single unit providing both propulsion and steering whereas a
large ship like the Queen Mary 2 has two fixed podded propulsors, ahead of
and further outboard, than the two rotating podded propulsors that provide
the steering force. Each of these podded propulsors has a 6 metre diameter
4 bladed propeller.
For each podded propulsor a seating is welded into the ships bottom
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structure to distribute the loads from the pod over a wide area of the hull.
The fixed propulsors are bolted directly to their seating whilst the steering
units are carried by a slewing ring in their seatings. Power from the ships
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
main machinery space is transferred to the motors in the steering pods via a
slipring unit.

Further Reading

‘Developments in water-lubricated bearing technology’ The Naval Architect
February 2004.
Marine Power and Propulsion – solutions for naval architects. The Royal
Institution of Naval Architects 2005.
ึ
Queen Mary 2: Genesis of a Queen The Royal Institution of Naval
Architects 2004.

Some Useful Web Sites

www.becker-marine-systems.com see Rudders, Kort Nozzles

www.hundestedpropeller.dk see Multi-pitch propellers and Bow/Stern
Thrusters
www.schottel.de see Rudder propeller, CP propeller, Transverse thruster and
Pod drives
www.stonemanganese.co.uk see propeller ‘Manufacture’ and ‘Nota-
ble Propellers’ and details ‘nickel-aluminium bronze alloy’, most widely
used propeller material.