Rotary thermal wheels are a mechanical means of heat recovery.

A rotary (rotatory) transformer is a specialized transformer used to couple electrical signals between two parts that rotate in relation to each other.

Rotational energy or angular kinetic energy is kinetic energy due to the rotation of an object and is part of its total kinetic energy.

Detremines the torque needed to for a desired angular acceleration about a rotational axis.

The rotating part of an electric motor.

The rotating parts of the wind turbine including the blades and blade assembly.

Rotor blades are connected to the wind turbine rotor. Aerodynamic forces, the same as on a aircraft wing, act on the blades to impart rotation.

The swept diameter of the turbine blades.

The British association founded in 1860 to promote the improvement of ships and everything that relates to them.

A device used for steering and manoeuvring a vessel. Rudders are hydrofoils which are pivoting on a vertical axis.

A hydraulic cylinder or a hydraulic motor which directly converts hydraulic pressure into mechanical action to move the rudder.

A device used to indicate the present position of the rudder blade, usually fitted in thewheelhouse, bridge wings and engine control room.

The main part of the rudder which provides the necessary surface for the impinging action and side pressure of the water

There are no regulation for the rating of the rudder area and very often crude empirical methods such as percentage of the underwater lateral area are used.

A fitting placed inboard (on the steering gear deck) which carries the whole weight of the rudder and the tiller. Rotary vane steering gears and some RAM-type steering gears have the rudder carrier integrated.

A welded construction or a casting providing support for the rudder blade and minimises the bending moment in the rudderstock.

Rudder propellers are azimuthing ducted or free-running propellers in a fixed or hinged vertical position. They are active control devices with a directed thrust.

An adaptive control system that uses the existing steering gear and rudder.

If the rudder blade has a sharp corner at the front lower edge, the flow cannot follow the sharp bend from the leading edge to the base plate causing cavitation in the front part of the rudder sole.

A lag on the stern frame or a bracket on deck at each side of the quadrant, to limit the swing of the rudder to approximately 37 deg port or starboard.