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Contra-rotating propellers are used on torpedoes due to the natural torque compensation and are also used in some motor boats. The cost of boring out the outer shafts and problems of mounting the inner shaft bearings are not worth pursuing in case of normal ships .
One of the four contra-rotating propellers on a Tu-95 Russian strategic bomber. In the 1950s, the Soviet Union's Kuznetsov Design Bureau developed the NK-12 turboprop. It drives an eight-blade contra-rotating propeller and, at 15,000 shaft horsepower (11,000 kilowatts), it is the most powerful turboprop in service.
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).
Contra-rotating propellers should not be confused with counter-rotating propellers, a term which describes propellers rotating in opposite directions but sitting apart from each other on separate shafts instead of sharing a common axis. Tandem-rotor helicopters such as the CH-47 Chinook also use a counter-rotating arrangement.
In larger and more modern engines, a rubber bushing transmits the torque of the drive shaft to the propeller's hub. Under a damaging load the friction of the bushing in the hub is overcome and the rotating propeller slips on the shaft, preventing overloading of the engine's components. [44] After such an event the rubber bushing may be damaged.
Bourbon Street has long been party central, and little changed in the hours after Surgeon General Vivek Murthy on Friday outlined the direct link between alcohol consumption and increased cancer risk.