The gas turbines on my old ship drove the main reduction gear by pushing the 
hot exhaust gas over a turbine, which was mechanically connected to drive an 
input shaft.  This was called a fluid coupling. The red. gear brought the speed 
down from some high RPM to about 100 RPM, and then the propeller had variable 
pitch so the ship's speed could vary from reverse to about 30 knots forward.  
Our stern would walk to starboard when the engines were at "all stop" because 
the shaft and prop were still spinning, which made docking maneuvering fun.
Max Dillon
Charleston SC
'87 300TD
'95 E300

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