Section 3 Rudder Torque

301. Rudder torque

The torque of general type rudder is to be obtained from the following formula.

kN m

: as defined in 201.

: distance (m ) form the center of rudder force on the rudder to the centerline of the rudder stock, determined by the following formula.

m

For the ahead condition, however, is not to be less

mi

obtained from the formula.

min

: mean breadth (m ) of rudder determined by the coordinate system in Fig 4.1.2

as defined in Table 4.1.4

: the balance factors of the rudder obtained from the following formula.

portion of the rudder stock (m )

plate area situated ahead of the centerline of the rudder

as defined in 201.

Fig 4.1.2 Coordinate System of Rudders

Table 4.1.4 Factor