| Controllable Pitch Propeller |
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Information AboutControllable Pitch Propeller |
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AIRCRAFT ' four controllable and reversible pitch propellers]] Such propellers are used in Propeller Aircraft to adopt the propeller to different Thrust levels and air pressures so that the engines don't stall or overturn. Also for cruising the engine can operate in its most economic range of Rotational Speed s. With the exception of going into reverse for braking after touch-down, the pitch is usually controlled automatically without the pilot's intervention. A propeller with a controller that adjusts the blades' pitch so that the rotational speed always keeps the same is called a ''constant speed propeller''. SHIPS Controllable pitch propellers or CCP for marine propulsion systems have been designed to give the highest propulsive efficiency for any speed, at any loading condition. When the vessel is fully loaded with cargo the propulsion required is much higher then when the vessel is empty. By controlling the pitch of the blades, the optimum efficiency can be obtained and fuel can be saved. The CCP also improves manoeuvrability of a vessel. When manouvring the vessel the advantage of the CCP is the fast change of propulsion direction. The direction of thrust can be changed without slowing down the propeller and depending on the size of the CCP can be changed in approximately 15 to 30 seconds. A reversing gear or a reversible engine is not necessary anymore, saving money to install and service these equipments. Sometimes this better manouvrablility of the vessel can mean that the vessel won't need a tug to dock at her berth. Despite the fact that the CCP is designed to give the highest propulsive efficiency for any speed, at full power a fixed propeller will have a slighter better efficiency then a CCP. Therefore you will not find a CCP on large vessels that make long trips at a constant service speed, for example crude oil tankers or the largest containerships. A CCP can mostly be found on harbour or ocean-going tugs, dredgers, cruiseships, ferries and cargovessels that sail to ports with limited or no tugassistance. At the moment the range of CCP goes up to 44000 kW (60000 hp). |
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