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2. Toroidal propeller - Wikipedia

   en.wikipedia.org/wiki/Toroidal_propeller

   A simple 3 blade 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 ...

3. 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.

4. Voith Schneider Propeller - Wikipedia

   en.wikipedia.org/wiki/Voith_Schneider_Propeller

   The first such ship to use the Voith Schneider propeller was the excursion boat Kempten. Two German 1935-type M class minesweepers M-1 and M-2 were fitted with VSPs. The first British ship to use Voith Schneider propellers was the double-ended Isle of Wight ferry MV Lymington, launched in 1938.

5. Propeller - Wikipedia

   en.wikipedia.org/wiki/Propeller

   Supercavitating propeller – Marine propeller designed to operate with a full cavitation bubble; Variable-pitch propeller – Propeller with blades that can be rotated to control their pitch while in use; Voith-Schneider propeller – Perpendicular axis marine propulsion system; Wake-equalising duct – Ship hull appendage to modify propeller ...

6. 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 ...

7. Category:Propellers - Wikipedia

   en.wikipedia.org/wiki/Category:Propellers

   Toroidal propeller; U. Underwater thruster; V. V-Prop; Variable-pitch propeller (aeronautics) Variable-pitch propeller (marine) Voith Schneider Propeller This page ...