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Simrad Reversible Pump RPU80/160/300
6 20220422N
An automatic "Rudder test" function in these autopilots will also
limit the output equivalent to a rudder speed of 8 degrees per
second which is optimum for autopilots with proportional rudder
control. (Equals to approx. 9 seconds for 35-0-35 degrees rudder
travel). Consequently when operating a steering lever or the
Port/Stbd push buttons on the autopilot in manual mode, the
rudder speed will be 8 degrees per second, whilst the rudder
speed when in "Auto" mode normally is less and proportional to
the heading error.
If the pump unit is used with older autopilot models like
AP2500, AP200 or AP45, using J1000B, J101A or J45A
junction units, the output level/flow rate is set by a
potentiometer within the junction unit.
External rudder speed control can be provided by a separate
potentiometer connected to J1000B/J101A/J45A and mounted
near the steering position.
The flow rate must be chosen such that optimum automatic
steering is obtained.
Experience has shown that a rudder time between 10 and 15
seconds hard over to hard over normally gives the best steering
performance. In order to achieve a rudder time within these
limits, the flow rate must correspond with the cylinder volume.
Some boats will perform good automatic steering even with a
hardover time of 20 seconds. The flow-rate, however, is reduced
by increasing load, i.e. increased pressure. It is therefore not
recommended to select a pump with a flow rate that is not able
to move the rudder hardover to hardover in 20 seconds as shown
on the nomogram on page 13. Study the tables on the following
pages for appropriate pump selection, and use the nomogram on
page 13 as a guideline.
On page 7 to 11 are listed some well known hydraulic steering
gears together with the corresponding values for the rudder time
hardover to hardover.
The values are calculated from the maximum flow rate at 10 bar
pressure.
If a specific system is not listed, the cylinder volume must be
calculated as explained in section 2.1.
Any well known hydraulic oil with viscosity between 15-70 cSt
at 40°C can be used with RPU80, RPU160 and RPU300.
Use higher viscosity in warmer areas.
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