In general,
azimuth drives are as efficient as
conventional shaft line systems.
However, the SSP Propulsor´s improved
efficiency results from its twin
propeller technology - two three-bladed
propellers rotate in the same direction
on a common shaft - combined with the
hydrodynamically optimized propulsion
module, and from the
permanently-excited propulsion motor.
This configuration has the advantage of
sharing the load between the propellers
with maximum productivity from both.
Two fins mounted between the propellers
on the propulsion module also increase
the overall efficiency, along with the
propulsor´s strut by gaining back the
swirl energy.
The permanently-excited synchronous
propulsion motor allows to reduce the
diameter of the housing and propeller
to 35-40 %, which has a dramatic effect
on the overall efficiency of the SSP
Propulsor.
Furthermore, the permanently-excited
propulsion motor itself is about 2 %
more efficient.
