voith schneider propeller
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Voith Schneider Propeller a special drive system that uses
cams to position rotating blades to propel a vessel. Unlike a
traditional propeller, it can create thrust in any direction, rather
than just fore and aft. They are used on
tractor tugs.
Attribution - Christopher Johnson - License
This animation
shows how the
blades change
direction so that
they are angled
to push in the
direction in
which thrust is
desired.

VS propellers
were used on a
class of Staten
Island ferries.
Attribution - Voith AG - Heidenheim -Germany