Almost all warships have balanced rudders, unlike merchant ships.
In the British RN there were 2 separate types.
The larger ships, some cruisers and above, often had their rudder supported mid way by a pintle due to the weight.
The much more common was a balanced rudder whose rotating axis, the part which penetrates the hull, has no pintle.
That axis point then has approx 1/3rd of the rudder ahead and 2/3rds abaft.
Construction is a steel frame inbetween which is solid fir or slab cork filling. This then has a special coating before the 8lb, about 1/4" plates are riveted to the frame thereby visually concealing the internal materials. The leading edge is reinforced.
The wood used, fir and slab cork was very lightweight. Elm was also used for a few other components on the larger rudders. All 3 are extremely durable in sodden conditions.
A full broadside. The traditional English salute.