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TURBINE
REDUCTION GEAR ASSEMBLY

Airman - Aviation theories and other practices
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EXHAUST CONE ASSEMBLY.—The exhaust cone (fig. 6-13), attached to the rear of the turbine assembly, is a tapered, cylinder-shaped outlet for the gases. The cone eliminates turbulence in the emerging jet, thereby giving maximum velocity. The inner cone is usually attached to the outer cone by streamlined vanes called brace assemblies. The exhaust cone itself is usually made of stainless steel sheets, reinforced at each end with stainless steel flanges. As much heat energy as possible is kept within the exhaust cone. A covering of layers of aluminum foil or other material acts as insulation for the cone. Turboprop Engines There are numerous models of the turboprop engine. The P-3 and E-2 aircraft are examples of aircraft that use turboprop engines. The turboprop engine was developed to provide the power requirements for aircraft of greater size, carrying capacity, range, and speed. The turboprop engine is capable of developing 2 1/2 horsepower per pound of weight. The turboprop converts most of its gas-energy into mechanical power to drive the compressor, accessories, and a propeller. The additional turbine stages needed to drive  the  extra  load  of  a  propeller  create  the low-pressure, low-velocity gas stream. A small amount of jet thrust is obtained from this gas stream. The turboprop engine (fig. 6-14) consists of three major assemblies: the power section, the torquemeter assembly, and the reduction gear assembly. The propeller assembly mounts on the reduction gear assembly to provide aircraft thrust. 6-8 Figure 6-13.—Typical exhaust cone assembly. Figure 6-14.—T56 turboprop engine.







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