TMQ Bosun-AP9, Operation And Installation Manual

Page: 21 / 63

TMQ Bosun - AP9 Rev1 (935) Page 21 16/06/2003
Rudder (Rudder Ratio) Control
This setting is used to determine the amount of rudder
the vessel requires for steering (actually, the amount of
rudder angle applied for a given angle off course).
The centre position is usually suitable for most vessels,
but should the vessel's steering be sensitive or slow,
adjustment maybe required.
In general, an agile vessel with a relatively large rudder or very small keel
will require a small rudder setting. A large, slow vessel may require a high
value for the rudder ratio.
This may also be adjusted according to speed - low speeds may require
more rudder angle for steering than high speeds.
•
A value of "1" signifies the minimum amount of applied rudder
(for sensitive steering, large rudders or low gearing ratio.)
•
A value of "10" signifies the maximum amount of applied rudder
(for vessels with slow steering, small rudders or high gear ratio).
When the
rudder setting is too low, turns will take an excessive amount of
time, and the vessel may "wander".
When the
rudder setting is too high, turns will be rapid and the
vessel will oversteer.