Sharrow's extraordinary looped propellers were already some 30% more efficient than traditional designs – and now the company has put two of them together into a coaxial, contra-rotating prop that ...

Schottel maintains 75-year heritage Celebrations to mark the 75th anniversary of German propulsion specialist Schottel, culminating in a spectacular fireworks display on the River Rhine, incorporated ...

An essential element of the proposal is that the diesel-electric pod propeller would contra-rotate behind the main propeller. It is claimed that this would give the increased propulsion efficiency ...