Construction
20222303 / A 7
1.3 Performance
The performance table shows the relation between the consumed
power and the output power. The “rudder torque midships” line
shows the output torque against the needed amperage at
midships rudder and the “rudder torque full rudder” line shows
the output torque against the needed amperage at full rudder. The
“hard over time” line shows the hard over time (time to travel
72° of rudder travel) of the drive relative to the output torque.
The table also presents the strength of the drive unit related to
man power. The unit is much stronger than a human being and
can last much longer. One should note however that when the
unit is operated in the dark grey zone, the trim of the boat is not
at its best and the sails should be adjusted to achieve lower
rudder torques. The below table shows that the Simrad direct
drive will steer the yacht even in the worst possible conditions.
As the drive will mostly operate in the light grey zone but not
continuously, the average power consumption on 12 volts is 2
amps.
h
a
r
d
o
v
e
r
t
i
m
e
rud
d
e
r
t
o
r
q
u
e
f
u
l
l
r
ud
de
r
rudder torque midships
0
1
2
150145
140135
3
4
5
6
7
8
9
10
11
12
13
A
mp
]
high steering forces,
not manageable by hand power
medium to high steering forces,
manageable for a helmsman for a few minutes
light to medium steering forces,
manageable for a helmsman for a few hours
Drive output torque
[
K
gm
]
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130
2
4
6
8
10
12
14
16
18
20
22
24
[
H
O
-
t
i
m
e
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