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Encyclopedia of Marine Technology

Rudder blade

The main part of the rudder which provides the necessary surface for the impinging action and side pressure of the water. A streamlined rudder blade consists of side plates stiffened by internal vertical and horizontal web plates and solid parts in cast steel which makes the housing of the rudderstock and the pintle.

Rudder blade sole should be rounded at the leading edge in order to avoid local cavitation and erosion. The contact area of conical connection between the blade and the rudderstock is to be verified by means of blueprint test (minimum 70%). Internal surfaces are to be covered by a corrosion-resistant coating. Means for draining the rudder blade after pressure testing or possible leakages are to be provided.

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