The WZ11 turboshaft engine was developed in china on the basis of the Pratt & Whitney Canada PT6B-67B. This engine has a power of 1500 kilowatts, and would enter mass production in 2012, for the Z-8F (AC313) helicopter. The PT6B-67A is used for Z-8F and the 50 PT6B-67C is used for Z-10.
The CZ8 is a 13-ton-class medium tactical transport helicopter. It is powered by 3 PT6b-67/6 turbo-shaft engines and has a configuration of rear ramp door and 6 main blades. The helicopter can hold 39 armed troops. It can be operated in IFR or VFR condition by day and night. The CZ8 can be used for transport of troops and cargo, search and rescue(SAR),medical evacuation(MEDEVAC), etc.The AC313 heavy helicopter has a maximum payload of 4 tons, a maximum cruise speed of nearly 160mph and maximum range of 940km with 20 minutes fuel reserve. The aircraft first flew in March 2010, and is powered by Pratt & Whitney PT6B-67B engines.
The initial models in the PT6B Series was derived directly from the legendary PT6T Twin-Pac«, benefiting from its renowned dependability and performance. The 1,000 shaft horsepower class PT6B series, a single engine configuration, has been produced in 6 models and its versatility has been demonstrated in a wide variety of applications. More recently, the PT6B-67A engine was developed with the PT6C-67A and PT6C-67C engine models providing the basis. More than 350 PT6B series engines power aircraft in service with 63 operators in 17 countries, having accumulated more than one million flying hours in such applications as emergency medical service, business and utility operations.
PT6B Series engines incorporate the latest technologies in the drive to exceed customers' expectations in performance, reliability, durability, fuel consumption and environmental friendliness. Six PT6B models have been produced ranging in shaft horsepower power from 900 to over 1,000 shaft horsepower. Key innovative design features have been introduced to the PT6B Series over the years to further increase its appeal in the market. The PT6B-37A features an automatic fuel control and an electronic power turbine governor with a manual back-up - a feature unique for single engine operations.
The PT6B Series is derived directly from the PT6T-3D power section with an offset output gearbox, including clutch system. The basic engine configuration is exactly the same as that of the PT6T and PT6A turboprop, i.e. a two-shaft configuration consisting of a multi-stage compressor driven by a single-stage compressor turbine and an independent shaft coupling the power turbine to the output shaft through the offset reduction gearbox. In fact, the base engine hot section is very similar to the PT6A-34 airline turboprop, thus continuing the heritage of airline-level dependability in P&WC's helicopter engines.
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