When you build it right, it just keeps going. A quick clip showing the oldest working Controllable Pitch Propeller – 70 years old and still in service.

The Tug boat "Herkules" from 1939, is being maintained by Berg Propulsion at Gotenius Ship Yard Sept 2009. The propeller is unique – it is the oldest controllable pitch propeller in service. It is the 3:rd propeller built by KaMeWa. Berg Propulsion was established 1912. http://www.bergpropulsion.com