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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.
The name Amphicar is a portmanteau of "amphibious" and "car." A spiritual descendant of the Volkswagen Schwimmwagen , [ 3 ] and the Trippel SG6 , the Amphicar offered only modest performance compared to most contemporary boats or cars, featured navigation lights and flag as mandated by the US Coast Guard – and after operation in water ...
An advanced type of propeller used on the American Los Angeles-class submarine as well as the German Type 212 submarine is called a skewback propeller. As in the scimitar blades used on some aircraft, the blade tips of a skewback propeller are swept back against the direction of rotation. In addition, the blades are tilted rearward along the ...
Contra-rotating propellers are also common in some marine transmission systems, in particular for large speed boats with planing hulls. Two propellers are arranged one behind the other, and power is transferred from the engine via planetary gear transmission .
Propellers are designed to work in-line with a propulsion plant and produce one-directional thrust while thrusters are more customizable and have a more versatile application. They have this versatility at the cost of complexity and lower efficiency – they are not as robust as propellers and typically have applications on smaller vessels that ...
Folding propellers reduce drag while not in use, thereby allowing for more speed or reduced fuel consumption. Folding propellers are no more efficient than fixed blade propellers, and have much poorer performance in astern. Less noise and vibration than fixed blades when not in use, since fluid flow will not cause the propeller to rotate.
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 ...
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.