- Schilling Rudder
A Schilling Rudder is a specific type of profiled rudder used on certain boats and ships. See
Rudder The Schilling Concept
The Schilling Profile is designed improve the effectiveness of the rudder and manoeuvrability of the craft, especially at slow speeds. The rudder is effective in both forward and reverse.
Use of the Schilling Rudder
Due to the nature of the design, the Schilling Rudders are commonly fitted to large slow moving ships such as container ships and oil tankers. Particularly as also longer/narrower ships are more prone to lack manoeuvrability due to their inherent shape.
Other slow moving boats, or boats with slower moving larger propellers, are also very suitable to the fitting of a Schilling Rudder.
The Schilling Shape
There is little concrete information available regarding the exact shape of the Schilling Rudder. However, the basic shape is a relatively simple ‘fish shape’ if viewed from above.And as well as the profiled sections, a pair of flat plates are fitted top and bottom to prevent or minimise end-effect on the aerofoil.
As can be seen from this image.
The basic principle proportions of a Schilling rudder layout are as follows:
*Max Width of aerofoil at 20% chord.
*Taper to 60% chord.
*Flat to 80% Chord
*Flare to 100%Or in other words, a bulbous widening for 1/5 of the total length of the rudder blade, with a streamlined narrowing for 2/5 of the length leading to a flat section lasting for around 1/5 of a cord-length, finalising in a blunt-ended flared trailing edge for the remaining fifth.
The width of the trailing edge to be 33% of the max width of the profiles. Width of plates to be at 2xMaxWidth.
The height should be similar to the diameter of the propeller, with the chord length being up to 1.2 times the propeller diameter. If extreme manoeuvrability is not required, chord length can be reduced to a minimum of 0.55 x Propeller diameter.
Around 40% balance should be provided (plate in front of the rudder pivot)
The distance from the trailing edge of the propeller to the leading of the rudder should be a minimum of 0.2xPropellor diameter. And the maximum angle of operation at 2*70 Degrees.
ee also
*
Azipod
*Rudder
*Kort nozzle
*Becker Flap External links
* [http://www.becker-marine-systems.com/ Becker Marine Systems. Fabricators of Commercial Rudder Solutions]
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