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2. Contra-rotating marine propellers - Wikipedia

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

   A Mark 46 Mod 5A torpedo is inspected aboard a destroyer in April 2005. Contra-rotating propellers have benefits when providing thrust in marine applications. Contra-rotating propellers are used on torpedoes due to the natural torque compensation and are also used in some motor boats.

3. West Marine Ltd. (Peel Engineering) - Wikipedia

   en.wikipedia.org/wiki/West_Marine_Ltd._(Peel...

   West Marine Ltd. was a wholly owned subsidiary of the Peel Engineering Company, which was founded by designer, inventor and engineer Cyril Cannell in the early 1950s to make Microcars, GRP boats and other fibreglass products. West Marine was located in the boat yard by the side of the River Neb at the top of Peel harbour, in the Isle of Man.

4. West Marine - Wikipedia

   en.wikipedia.org/wiki/West_Marine

   West Marine is an American company based in Fort Lauderdale, Florida, which operates a chain of boating supply and fishing retail stores. The company has 247 retail stores in North America. West Marine also runs Blue Future [2] a non profit organization. West Marine's flagship store is in Fort Lauderdale.

5. Contra-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Contra-rotating_propellers

   Contra-rotating propellers Contra-rotating propellers on the Rolls-Royce Griffon-powered P-51XR Mustang Precious Metal at the 2014 Reno Air Races. Aircraft equipped with contra-rotating propellers (CRP) [1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston engine or turboprop engine to drive a pair of coaxial propellers in contra ...

6. Counter-rotating propellers - Wikipedia

   en.wikipedia.org/wiki/Counter-rotating_propellers

   Counter-rotating propellers World War I Linke-Hofmann R.I German heavy bomber (1917) with counter-rotating propellers He 177A Greif with 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.

7. Toroidal propeller - Wikipedia

   en.wikipedia.org/wiki/Toroidal_propeller

   A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...