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Measurements and calculations for applying the RPU
20220422N 13
Recommended rudder time: 10-15 seconds is normal for a 70°
(35°-0-35°) rudder angle. (The time will be shorter for smaller
angles and longer for larger angles.) A longer rudder time (20
sec.) should be chosen if the boat has a quick response.
Example:
The stroke length is measured to be 20 cm, D = 5.0 cm and d =
1.8 cm
The cylinder volume is:
4
)8,15(20
22
π
−
= 340 cm
3
From the nomogram we find that the estimated rudder time in
seconds, hard over to hard over, will be 7 seconds for RPU300,
13 seconds for RPU160 and 25 seconds for RPU80.
RAM (CYLINDER) CAPACITY
REVERSIBLE PUMP UNITS RPU80/RPU160/RPU300, CAPACITY NOMOGRAM AT 10 BAR PRESSURE.
RUDDER TIME (SEC.) H.O. TO H.O. FOR A GIVEN CYLINDER VOLUME.
R
P
U
1
6
0
(
1
6
0
0
c
m
/
m
i
n
.
)
3
R
P
U
8
0
(
8
0
0
cm
/
m
i
n
.
)
3
900
5
5
10 20
2515 SEC.
800
700
600
500
400
300
200
100
10
15
20
25
30
35
40
45
50
55
1000
60
67
R
P
U
3
0
0
(3
0
0
0
c
m
/
m
i
n
.
)
3
Figure 2-1
Capacity nomogram for Reversible Pump
RPU80/RPU160/RPU300
Based on the above calculation and the nomogram, the
recommended pump type should be RPU160.
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