Intellisteer Europe

Setting The Flow Rate

A hydraulic pump that does not have variable flow (unless dedicated to a range of yachts) will be operating either too quickly or too slowly in 90% of cases.  Autopilot manufacturers get around this problem by adjusting the output to the pump to compensate. However, this either forces the pump to operate for longer periods of time which increases power consumption and wear on the parts, or the pump will operate at high pressure for short periods of time - also putting unnecessary strain and wear on the system.

Octopus variable flow reversing pumps precisely control the speed of the ram, reducing battery consumption, pressure, strain and wear on the hydraulic system.

 

Getting The Best Steering Performance For Your Boat

The flow rate of the pump can be set to get the best ‘hard over time’ (cylinder ram speed) for the particular boat.  There is a simple equation to calculate the hard over time:

HARDOVER TIME =

CYLINDER (RAM) CAPACITY x 60


FLOW RATE

Example

A boat has a 200cc steering cylinder (ram) and a 12 volt system.  So either the OCTAF1012 or the OCTAF1212 would be suitable (see table below left).   For this example we are using the OCTAF1212 which has a minimum flow rate of 600cc/min and a maximum flow rate of 1200cc/min:

MIN HARDOVER TIME:

200 x 60


600

= 10 sec

 

MAX HARDOVER TIME:

200 x 60


1200

= 10 sec

The flow rate on the pump can be adjusted so that the hard over time is between 10 & 20 seconds - select which is most suitable for this particular boat.

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