Operation Manual

2. TECHNICAL SPECIFICATIONS and APPLICATION
The output ow rate of an electric pumpset determines the maxi-
mum speed of the rudder. Under normal conditions a rudder speed
of 10 to 16 seconds will provide the best steering results for most
autopilot systems. It is therefore important to select the proper
pumpset to optimize your autopilot operation.
First determine the volume of your steering cylinder. This is usu-
ally indicated in the instruction manual of your steering system.
Enclosed at the back of this manual are lists of various steering
cylinder manufacturers with their cylinder models and volumes.
If you have to calculate the volume of your cylinder manually you
can use the following formula:
Volume = L(D
2
-d
2
)π÷4
Where:
L = length of stroke of cylinder
D = internal diameter of cylinder
d = diameter of piston rod
π = 3.14 (Pi)
The rudder speed, hard over to hard over (HOH), is determined
by dividing the volume (cu in) of the cylinder by the output of the
pumpset (cu in/sec). For example: a 15 cu in cylinder speed would
be approximately 14 seconds HOH using an HRP11 or approxi-
mately 9 seconds using and HRP17.
MODEL HRP
05-12
HRP
11-12
HRP
17-12
HRP
05-24
HRP
11-24
HRP
17-24
VOLTAGE 12 VDC 12 VDC 12 VDC 24 VDC 24 VDC 24 VDC
OUTPUT/SEC 0.5 cu in 1.0 cu in 1.6 cu in 0.5 cu in 1.0 cu in 1.6 cu in
AVERAGE AMP 3-5 4-6 5-8 2-4 3-5 3-5
WEIGHT (lbs/kgs) 10/4.5 10/4.5 10/4.5 10/4.5 10/4.5 10/4.5
p02