9
ACTUATOR SELECTION
It is important to select the correct size of actuator as it directly influences the
steering performance and power consumption.
The type of vessel to be steered must be considered. The hard over time may
be faster on a light weight planning craft and modern yachts or slower on a
displacement power boat or long keel yacht.
Also consider the rudder, an unbalanced rudder will require more torque than
a semi-balanced or balanced design.
Hard over time
Tiller arm Rudder Deg. Typical Max Torque
RAM
T1
13
sec
190
mm
80
120
kg
13
sec
213
mm
70
140
kg
13
sec
245
mm
60
160
kg
RAM
T2
9
sec
190
mm
80
120
kg
9
sec
213
mm
70
140
kg
9
sec
245
mm
60
160
kg
Hard over time is the time to move the cylinder full stroke (255 mm at 5 kg)
Typical max torque intermittent is calculated at 650 kg thrust.
RAM
T1
25°C
RAM
T2
25°C
