Hamilton Jet HJ241 Manual page 27

HJ-241 / HSRX
A.
JETTY
B.
Figure 5: Docking
D .
OCKING
Use the above procedure when approaching or
moving away from a jetty or another vessel.
NOTE: If the vessel is moving sideways too fast the
controls should be set back to zero speed and
the Helm returned to centre. Alternatively set
the controls for sideways movement in the
opposite direction until the vessel stops
moving sideways. The required control
setting will vary according to wind and tide
conditions.
WITH TRIPLE JETS:—Using all three Jets to move
sideways will give the best results.
1. Set the Steering to dead ahead, all three Reverse
Ducts to the "Zero Speed" position and RPM on
all Engines to the same value. (The RPM required
for manoeuvring will depend on the prevailing
sea conditions, higher RPM will improve
response).
2. For sideways motion to port, set the port Jet full
astern and the starboard Jet full ahead (this is
reversed for sideways motion to starboard).
3. Use the centre Jet Reverse Duct to control fore
and aft movement (Duct approximately 80%
reversed).
2.4 M
4. Use the Helm to control turning (rotation)
moments, i.e. for sideways motion to port turn
the Helm to starboard to balance the turning
moment of the port and starboard Jets.
This method of sideways manoeuvring should result
in 33% more side thrust than if only two Jets were
used. Once set up, only the centre Jet Reverse
Control and the Helm need to be used for controlling
the sideways movement.
M S .
OVING TO TARBOARD
Follow instructions 1 to 4 above, but for "Port" read
"Starboard" and vice versa.
T S S M
O TOP IDEWAYS OVEMENT
1. Set the Helm to dead ahead, Throttle RPM to idle
and Reverse to Zero Speed before the vessel
reaches the required position.
2. Alternatively set Controls to start sideways
movement in the opposite direction until vessel
stops sideways movement then set the Controls
to:-
• Steering: - Ahead Position (Centred).
• Throttle: - Idle.
• Reverse: - Zero Speed.
EMERGENCY MANOEUVRING:
1. With Multiple Jets. Shut down the engine driving
the Jet without reverse and manoeuvre using the
other Jet(s).
2. With a Single Jet. The vessel can be partially
manoeuvred by raising the Reverse Duct with a
rope and lowering it under its own weight. The
engine must be kept at idle RPM.
2 SYSTEM OPERATION
D
ANOEUVERING AND OCKING
.
2.5