Operating manual ALPHASEAPILOT MFC Issue 1.1 Page 29 of 84
ALPHASEAPILOT MFC
The Rudder Control value (1 to 9) is adjustable as follows:-
a) Use the “CONTROLS” key to enter the Controls Menu
b) Use the “CONTROLS” key again to select “RUDDER” box followed by flashing
value “1-9”
c) Use the rotary (+/-) illum. control to set value “1-9” as required
The Rudder Control is principally employed to prevent Autopilot “Understeer” and
“Oversteer” and the operator control band may be optimised by use of Loop Gain
adjustment (Section 2.22) during later Sea Trials.
2.4 (iii) YAW Control
manually adjusted in the Non Adaptive Mode. It also requires manual adjustment
in the Adaptive Mode unless HSC (High Speed Craft) operation is selected when the
automatic “Weather” function becomes active.
Rated 1 to 9, a “YAW” value of 1 specifies minimum Yaw (max. sensitivity) when the
Autopilot will respond to course error of ±0.5°. At maximum Yaw (9) a deadband of approx
±10° is prescribed. (Whilst the term “Deadband” is used it should be noted that provided
the AUTOTRIM feature is operational, the Autopilot will ensure that the average course is
maintained whilst disregarding short term course errors arising from pitch and roll etc. thus
avoiding unnecessary Rudder movement)
As a general rule the Yaw control should be set to provide good sensitivity, which would
normally be reduced in heavy weather. (See Section 2.25).
To adjust the YAW value:-
a) Use the “CONTROLS” key to enter the Controls Menu.
b) Use the “CONTROLS” key again to select “YAW” box followed by
flashing value “1-9”.
c) Use the rotary (+/-) illum. control to set value “1-9” as required.
2.4 (iv) COUNTER Control
Like the RUDDER Control, in the Adaptive Mode, the “value” of the COUNTER (Rudder)
parameter will be found automatically (after initial Sea Trial calibration) by reference to
input speed and draft data etc. Even so, the COUNTER value can be manually changed – to
immediately optimise the steering performance – if required via the CONTROLS Menu.
The “COUNTER” value (1 to 9) prescribes how much opposite rudder is applied to prevent
overshoot in a turn, or, how much additional rudder is applied to arrest a sudden or fast and
unspecified departure from the Set Heading. (Section 2.24 refers).
To adjust the COUNTER value:-
a) Use the “CONTROLS” key to enter the Controls Menu
b) Use the “CONTROLS” key again to select “COUNTR” box followed by flashing
value “1-9”
c) Use the rotary (+/-) illum. control to set value “1-9” as required.
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