System description
20222303 / A 5
1 SYSTEM DESCRIPTION
1.1 General
The DD15 Direct Drive is a very strong and compact autopilot
drive and more efficient than hydraulic and most electro-
mechanical autopilot drive units. It is powerful (the max. output
torque of 150 Kgm is equivalent to 150 Kg force on the end of a
1 meter steering tiller) and is build for 24 hours per day
continuous operation with a total weight of only 12 Kgs. The
combination of the flat wound (pancake) electric motor with the
efficient planetary and spur gearbox results in an extremely
efficient drive unit to keep the battery charging time to the
minimum. The drive can be used on boats from 30 to 45 feet
l.o.a. (or up to 150 Kgm rudder torque) equipped with a
mechanical steering system that can be back driven. Due to the
electro mechanical clutch, the direct drive can be back driven
with the force of a finger tip leaving the mechanical steering as
sensitive as without drive unit.
The DD15 includes the Simrad RF300 Rudder Feedback unit
with transmission link and 10 m (30 feet) of cable. It transforms
the angular travel of the rudder to a digital signal read by the
autopilot steering computer.
Figure 1-1 Simrad DD15 Direct Drive (with RF300)
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