Boat rudder blade
Clements marine

Clements Marine manufactures a large number of rudder profiles to suit the individual hull, ranging from slow speed
displacement boats to 'deep vee' planing designs, and covering many other applications.The principal designs are
shown above and include dagger type, conventional spade and wedge profile rudders.
Rudder design is of paramount importance to the performance of the boat, especially for high speed craft. Steering
performance must be optimised, whilst drag is kept to a minimum. Clements Marine's experience will help the boat
designer optimise conditions both in terms of high speed directional sensitivity, and low speed manoeuvrability.
Through-Hull mounted rudders are generally cast in one piece from either AB2 (nickel aluminium bronze) or
HTB1(high tensile brass). They are mounted through the hull in a rudder tube fixed to the inside of the hull (see
common alternatives page 2). Bearing and sealing arrangements depend on the particular design selected.
Transom mounted rudder assemblies are precision machined from one piece castings in HTB1 or AB2 and are fitted
with seals to prevent ingress of water. Backing plates can be supplied with fixing bolts and greasers for lubricating
bearings. These can include an integrally cast, anti-cavitation plate at the top of the blade.
When required Clements Marine can manufacture bespoke plate rudder profiles from either mild steel or type 316
stainless steel. Alternatively, hollow aerofoil type 316 stainless rudder/stock assemblies are available from in-house
designs or to customers drawing. All rudder/rudder stock assemblies can be supplied to order under Lloyds/Norske
Veritas/ABS survey.