||The Voith Schneider (V/S) units are cycloidal
propellers, there is one at each end of the boats, and have the advantage
of enabling the boats to approach the terminals end on whatever the tide.
The V/S units are geared down to 90 rpm.
The V/S (Voith Schneider ) unit is what both
propels the boat through the water and is also used for manoeuvring the
boats more easily in the tidal waters of the Thames. There is one at each
end of the boat and, they give the boat the ability to go in either direction
and turn in their own length. They can also move sideways, or spin, just
by altering the angle of the blades.