Kaplan 3B & 4B Propellers
The Austral
Kaplan
style propeller is the major part of a complete ducted propeller system. This
specially designed propeller is mounted within a venturi shaped nozzle which for
highly loaded applications can develop substantially greater thrust than open or
free propellers.
Using this system the bollard pull (i.e. thrust) of trawlers and
the like can increase by 25 to 35% while harbour tugs can typically increase 30
to 50% as compared to open propellers. In fact when a nozzle of correct
geometric design is combined with an Austral
Kaplan propeller, it can mean the same
bollard pull could be achieved with a smaller engine providing substantial
running cost savings.
Raked Kaplan 3B & 4B Propellers
Conventional propellers have the blade face generation at 90 degrees to
centre
axis whereas the raked design has blades which are tilted at an angle to the
centre axis. Austral now produces Kaplan
propellers with aft rake, basically the centre of the blade at the tip is approximately in line with the rear face of
the propeller
hub. This aft rake design normally means a larger diameter propeller can be fitted because of greater aperture available
toward rear of boat.
| Design Features and Advantages: |
|
| * Improved steering and manoeuvrability |
* Individually pitchometer checked |
| * Raked models available |
* Statically balanced |
| * Cast in Nibral and Manganese Bronze |
* Bollard pull increased 25 to 50% |
| * Reduced vibration and noise |
* Substantial fuel savings |
| |
