We are a world leader in propeller design.
We supply controllable pitch propellers, fixed pitch propellers, and the innovative adjustable bolted propeller. Unlike other propulsor designers we have our own hydrodynamics research centre, equipped with two cavitation tunnels. In over 40 years of operation the centre has tested around 1,400 propellers and waterjet pumps to perfect and prove the design. Our propellers deliver good fuel economy, low vibration and noise levels and minimal cavitation.
A propulsion system upgrade designed for reduced fuel consumption by integrating the design of rudder and propeller systems. Promas Lite is not just a propeller upgrade – rudder performance is optimised as well.
Promas Lite is a version of our successful Promas integrated propeller and rudder system, designed specifically as an upgrade for vessels already in service.
The upgrade consists of three main components:
- Bulb which is attached to the forward edge of the rudder
- Hubcap which is bolted to the rear of the propeller
- Set of redesigned propeller blades
Each Promas Lite system is custom engineered to an individual vessel. We model each solution using the extensive in-house CFD (computational fluid dynamics) capabilities at our Hydrodynamic Research Centre to ensure that each design is matched to the hull and specified operating profile.
- Reduced fuel consumption - improvements of up to 20% can be expected, depending on the vessel’s operating profile
- Reduced environmental impact - corresponding reduction in emissions with lower emission taxes
- Short payback period - depends on vessel operating profile, but normally less than two years
- Increased propulsive efficiency - integrated rudder and propeller design, reduced pressure pulses for improved comfort
- Simple and quick installation - can be normally fitted within a week
- Lower maintenance costs - reduced engine loads means less oil consumption and potentially reduced engine wear
Which vessels can be upgraded?
Promas Lite is suitable for both twin and single screw vessels. The best results are achieved on bulky single screw vessels with a high block coefficient. Promas Lite has been installed on a twin-screw passenger vessel with considerable success. Vessels which, have changed their operating profile for which they were designed, have most to gain.
Propulsive efficiency improvements of between 8 and 16 per cent have been measured on the upgrades delivered so far, while improvements of up to 20 per cent are possible.
Each Promas Lite system is custom engineered to an individual vessel and its specified operating profile, using our extensive in-house CFD (computational fluid dynamics) capabilities.
Why is Promas Lite so efficient?
Promas Lite integrates the propeller and the rudder into a single system. Behind a normal propeller hub there is a strong low-pressure vortex (hub vortex) that acts on the propeller hub, increasing drag and reducing propeller thrust. A special hubcap is fitted to the propeller, which streamlines the flow onto a bulb that is added to the rudder, effectively reducing flow separation immediately after the propeller.
The result is an increase in propeller thrust, as previously wasted energy is recovered from the flow. The addition, the bulb on the rudder also streamlines the flow aft of the rudder, further reducing drag. The hubcap is mounted outside of the propeller hub and acts purely as a hydrodynamic fairing. No special hub design is needed, thus cost and technical complexity is kept to a minimum. Adopting the twisted rudder design of the Promas system can yield further improvements in efficiency and manoeuvrability.
What’s involved in a PROMAS upgrade
The installation is simple and straightforward, with only three areas of modification, as illustrated above. The upgrade can normally be completed within a week.
Contacts and support
If you are interested in learning more about PROMAS Lite, or if you would like to discuss your requirements in more detail please contact us and we’ll be happy to help.
Propeller design techniques continue to improve, and when a vessel has been in service for some time it can often pay to invest in a new set of propeller blades.
Due to advances in hydrodynamic analysis and blade manufacture the new blades will be more efficient than the old ones, which will also be suffering from normal wear and tear. If the vessel has changed its operational profile the gains can be even higher.
We have carried out numerous re-blading jobs that have resulted in substantial reductions in fuel consumption and short payback times, with a subsequent reduction in emissions. An added bonus is usually a reduction in vibration and propeller induced noise. Ships are studied to see if new propeller blades will pay off – contact your local KONGSBERG service centre if you have a candidate vessel and determine the potential savings.
Our trained technicians will go through a series of steps to deliver fully refurbished blades:
- Download the original CAD blade drawings
- Complete a 3D measurement of the damage blade
- Analyze and compare the measured blade to the original blade drawings
- Restore the blade to original state by using the equipment to bend, weld, grind and/or polish
- Balance the blade to align efficiency with the rest of the blade units
Contacts and support
If you are interested in learning more about our propeller re-blading service, or if you would like to discuss your requirements in more detail please contact us and we’ll be happy to help.