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2. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   A contra-rotating propeller was patented by F. W. Lanchester in 1907. [9] Some of the more successful British aircraft with contra-rotating propellers are the Avro Shackleton, powered by the Rolls-Royce Griffon engine, and the Fairey Gannet, which used the Double Mamba Mk.101 engine. In the Double Mamba two separate power sections drove one ...

3. Contra-rotating marine propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_marine...

   However, in commercial ships and in traditional machinery arrangement, contra-rotating propellers are rare, due to cost and complexity. ABB provided an azimuth thruster for ShinNihonkai Ferries in form of the CRP Azipod, [2] claiming efficiency gains from the propeller (about 10% increase [3]) and a simpler hull design.

4. Counter-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Counter-rotating_propellers

   Counter-rotating propellers (CRP) are propellers which turn in opposite directions to each other. [1] They are used on some twin- and multi-engine propeller-driven aircraft. The propellers on most conventional twin-engined aircraft turn clockwise (as viewed from behind the engine). Counter-rotating propellers generally turn clockwise on the ...

5. Propfan - Wikipedia

   en.wikipedia.org/wiki/Propfan

   Other contra-rotating propeller engines that featured on common aircraft included the four powerful Kuznetsov NK-12 engines (each powering its own set of coaxial contra-rotating propellers) on the Soviet Union's Tupolev Tu-95 high-speed military bomber and Antonov An-22 military transport aircraft, and the Armstrong Siddeley Double Mamba (ASMD ...

6. Ducted propeller - Wikipedia

   en.wikipedia.org/wiki/Ducted_propeller

   A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...

7. Propeller (aeronautics) - Wikipedia

   en.wikipedia.org/wiki/Propeller_(aeronautics)

   Contra-rotation also increases the ability of a propeller to absorb power from a given engine, without increasing propeller diameter. However the added cost, complexity, weight and noise of the system rarely make it worthwhile and it is only used on high-performance types where ultimate performance is more important than efficiency.