Hamilton Jet HJ241, Manual

Page: 23 / 202

2.1
Section 2
S
YSTEM
O
PERATION
2.1 STARTING UP
NOTE: With HSRX Reverse Control, the Reverse
Duct may slowly drop to a full reverse
position when the engine is not running.
At start up, the Reverse Duct may be in full reverse
position, but will move to correspond with Control
Lever position as soon as the JHPU (Hydraulic
Pump Unit) is running.
1. Before starting engine(s), the following checks
should be carried out:
a) The vessel is securely tied up or well clear of
other objects.
b) The Helm is centred and the Reverse Cotnrols
are at Zero Speed.
c) Clutches and Gearboxes, if fitted, are in
neutral position.
2. After starting engine(s), adjust the Helm and
Reverse levers, to control vessel movement.
2.2 “AHEAD” / “ZERO SPEED” /
“ASTERN” CONTROLS
"Astern" and "Zero Speed" are achieved by
redirecting the jetstream. If the Reverse Duct is
lowered fully, all of the jetstream is redirected back
under the vessel giving "Full Astern Thrust". If the
Reverse Duct is lowered partially the jetstream is
split giving some ahead and some astern thrust. At
a certain Reverse Duct position the ahead and
astern thrusts will be equal so the vessel will not
move ahead or astern regardless of the throttle
opening.
This position is given the technical term
"Zero Speed" . (This term should not be confused
with the neutral position of a gearbox when the
driveline stops rotating).
When operating the Hamilton Reverse Control, the
Jet Unit is always rotating regardless of the position
of the Reverse Duct. Any intermediate position
between ahead and astern can be selected to give
infinitely variable speeds when manoeuvring.
C
AUTION
Never stop the engine(s), or
disengage the drive to the Jet Unit,
when approaching a mooring or at
any time when control of the
vessel may be required.
W
ARNING
Selecting ’Astern’ (Crash Stop)
while the vessel is moving ahead
at high speed can produce very
rapid deceleration. and should
only be used in an emergency sit-
uation.
New operators should use the
"Crash Stop" feature very care-
fully.
Do not use full helm control until
the vessel has slowed.