Promas With Nozzle Offers Imporved Fuel Efficiency

MarineLink.com
Wednesday, June 05, 2013

Promas is a Rolls-Royce propulsion system that integrates the open-water propeller and rudder of a conventional shaftline into a hydrodynamically-efficient entity.

A tapered hubcap is fitted to the hub of the propeller and leads the water flow on to a bulb which forms part of the spade rudder. The rudder has a twisted leading edge, optimized for the flow from the propeller, which converts into additional forward thrust some of the swirl energy in the slipstream that is normally lost.  According to the manufacturer, Promas installations on merchant vessels have given propulsion-efficiency improvements up to 6-8% on new buildings, and up to 15% on upgrades of existing vessels.

Building on this success, Rolls-Royce has further developed the Promas system to suit applications where there is a requirement for a high bollard pull, such as anchor-handling offshore vessels (AHTS) and tugs. The operational profile of many offshore vessels is different from merchant ships, requiring both a large pulling power at low speed and a high free-running speed in transit.

The Promas with nozzle system is designed for these varying operating modes, in the case of anchor-handlers offering an increase in propulsion efficiency in both modes. The complete AHTS installation comprising Promas with nozzles and optimized propellers and rudders, can reduce fuel consumption in transit by 15%, and in some cases more, with a consequent cut in emissions. It can also improve the bollard pull by typically 5%.

This system unites a new type of nozzle with an optimized propeller, hubcap, rudder bulb and a special rudder profile. Components are designed to work together to provide a ducted system, maximizing efficiency and minimizing disturbances to the water flow both through and around the nozzle. The profile of the InnoDuct nozzle for the new Promas system has been developed through CFD analysis and testing, and represents a major advance on the 19A profile which is used for conventional nozzle propeller installations.

Water flow leaving the nozzle interior passes over a rudder of special profile developed to provide very high steering side forces yet minimum drag. Depending on the exact requirements the rudder may be either a one piece design or a medium flap type.

Maritime Reporter June 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

HydroComp to Hold Propeller 'Mini-Workshop'

A special version of HydroComp's intensive Propeller Workshops will be brought to Tampa before the start of IBEX 2014.   The Mini-Workshop is a special version

Volvo Penta Diesel Sterndrives for Metal Shark Patrol Boats

Metal Shark now offers Volvo Penta diesel sterndrives in its 29 Defiant patrol boats for customers requiring optimum performance, durability and maneuverability.

Wilhelmsen Secures Inert Gas System Orders

Breakthrough order in Japanese shipbuilding market sees largest ever capacity Maritime Protection IG units delivered for leading domestic owners. Wilhelmsen

Fuels & Lubes

Danish Bunker Trader Joins GAC in London

GAC Bunker Fuels says it has appointed former GAC Denmark Shipping Assistant Ida Ryberg as a Bunker Trader with its UK team. Ryberg joins Andy Boichat and Resham

Nation’s Vessel Operators Join EPA as SmartWay Affiliate

The American Waterways Operators, a 350-member trade association representing the U.S. tugboat, towboat and barge industry, announced today that it joined the SmartWay Transport Partnership,

Phillips 66 Marine Fueling Facility Nears Completion

Phillips 66’s previously announced marine over-the-water fueling facility at its Richmond, Calif. terminal is nearing completion. The facility, located on Canal Boulevard, and known as Pier No.

Marine Equipment

Westermeerwind Wind Farm Construction Begins

Mammoet announced today that Westermeerwind BV has reached financial close on July 25 for the turnkey construction of the Westermeerwind wind farm in Ijsselmeer,

HydroComp to Hold Propeller 'Mini-Workshop'

A special version of HydroComp's intensive Propeller Workshops will be brought to Tampa before the start of IBEX 2014.   The Mini-Workshop is a special version

QinetiQ Signs Contract with ASV

QinetiQ, as part of a new Marine Surface Target Service, has signed a contract with Autonomous Surface Vehicles (ASV) for the supply and operational support of autonomous surface target vessels.

Vessels

MOL Commended with Quality Ship Awards

MOL Commended for ‘FY2013 Best Quality Ship Award’; MOL president Koichi Muto meets with captain and chief engineer, exchanging views and working to establish a more solid safe operation system.

Farstad Offshore Vessel Squadron Chartered Out

Farstad Shipping ASA reports the following charter contracts, with a total value (including options) of approximately NOK 1.75-billion, as follows: Inpex has awarded

Better Operational News from Fugro

Fugro says that (an as yet unidentified vessel) recently affected by a fire is back in operation. The total time out of operation amounted to seven weeks. Secondly,

 
 
Maritime Contracts Naval Architecture Navigation Offshore Oil Pod Propulsion Ship Electronics Ship Repair Ship Simulators Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.8500 sec (1 req/sec)