IBX5980432E7F390 Olah Gerak Asd Tug 2 - BLOG PELAUT

Olah Gerak Asd Tug 2

MAKING FAST AT SPEED 

Illustration 46

Making fast on the forward winch at low speeds 
Speed lower than about 4 to 5 knots. 

Illustration 47

Making fast forward winch at high speeds 
Speed higher than about 4 to 5 knots. 
Keep to the sheltered Lee side of the large vessel’s bow. If speed allows, keep outside unit dead slow astern. 
In case of an emergency, give full power on outside unit. The tug will gain speed and turn away from the bow. 

Illustration 48

Making fast on the aft winch 
Keep to the sheltered lee side of the large vessels bow. If speed allows, keep inside unit dead slow ahead. 
In case of an emergency, give full power on inside unit. The tug will gain speed and turn away from the bow. 

Illustration 49

Making fast in rough wave conditions 
Use small thruster angles for quick response to waves and keeping clear from the vessel’s transom. 

Illustration 50

Switch winches 
If the Fore winch breaks down, turn around and use the aft winch (if fitted). 
Note : use a Fore runner. 

Illustration 51

Transverse arrest 
Used for stopping a vessel. 
Most effective at speeds above 7 knots. 
When the speed reduces, the thrusters can slowly be turned to the direct arrest mode. 
See Illustration 52.
Monitor the engine speed to prevent stalling. 

Illustration 52

Direct arrest 
Used for stopping a vessel. 
Most effective at speeds below 7 knots. 
Monitor the engine speed to prevent stalling. 

Illustration 53

Indirect mode 
When the speed reduces, gradually move to the combination mode. 
See Illustration 54

Illustration 54

Combination mode 
Used for turning a vessel or keeping her on course. 
Most effective at speeds below 7 knots. 

Illustration 55

Clearing a thruster from ice
When a thruster is blocked or likely to be blocked by ice, disengage the thruster and reverse it. This allows the ice to float out of the thruster. The other thruster is still available for sailing/maneuvering. 

When clearing the thruster by using the wash of the other thruster, the other thruster may get blocked too. (Illustration 56)

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