1.2.2 Linear Drive Units
The Autohelm Linear Drive Units are of
outstanding design which features powerful thrust,
fast hard overtimes and near silent operation.
When backdriven the movement is smooth with
minimal backdrive force. Using a high tensile belt
drive and epicyclic reduction gearbox the powerful
electric motor is controlled by an electronic fail-
safe clutch.
The design is highly efficient and provides high
performance for minimum current consumption.
A tiller arm of adequate strength must be used to
transfer drive from the drive unit to the rudder
shaft. Both Edson and Whitlock Marine provide
suitable standard tillers.
Type 1 Type 2S Type 2L
Supply Voltage 12 volts 12 volts(24V optional) 12 volts(24V optional)
Peak Thrust 295Kg(650lb) 480Kg(1050lb) 480Kg(1050lb)
Maximum Stroke Speed 28mm/sec(1.1
in/sec)
28mm/sec(1.1 in/sec) 28mm/sec(1.1 in/sec
Maximum Stroke 300mm(12in) 300mm(12in) 400mm(16in)
Overall length at Mid
Stroke 'A'
700mm(27.5in) 700mm(27.5in) 850mm(33.5in)
Tiller Arm Length 'B'
(+35deg Rudder)
250mm(10in) 250mm(10in) 350mm(14in)
Maximum Rudder Torque 735Nm(6500lb in) 1190Nm(10,500lb in) 1660Nm(14,700lb in)
Power Consumption
(typical average)
1.5 - 3 amps 2.75 - 6 amps 2.75 - 6 amps
Suitable for vessels up to 14m(45ft) LOA 17m(55ft)LOA 18m(60ft)LOA
Maximum displacement 11800Kg(26000lbs) 20000Kg(44000lbs) 25000Kg(55000lbs)
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