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EXHAUST CONE ASSEMBLY
Turboshaft gas turbine engine

Airman - Aviation theories and other practices
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POWER SECTION.—The power section consists of an axial-flow compressor, a combustion chamber, a multi-stage turbine, and an exhaust section. The last two stages of the turbine are used to drive the propeller using the torquemeter assembly and the reduction gear assembly. TORQUEMETER ASSEMBLY.—The torque- meter assembly electronically measures the torsional deflection (twist). Torsional deflection occurs in the power transmitting shaft that connects the power section to the reduction gear assembly. This torsional deflection is recorded as horsepower. REDUCTION GEAR ASSEMBLY.—The reduction gear assembly reduces the engine rpm within the range of efficient propeller rpm. The ratio on some installations is as high as 12 or 13 to 1. This large reduction ratio is necessary because the gas turbine must operate at a very high rpm to produce power efficiently. This engine operates at a constant rpm. The propeller blade angle changes for an increase or decrease in power while the engine rpm remains the same. The typical propeller assembly for a turboprop engine (fig. 6-15) consists of a front and rear spinner assembly, a hub-mounted bulkhead assembly, the dome assembly, four blades, an afterbody fairing assembly, and a propeller control assembly. The propeller assembly converts the power developed by the engine into thrust as efficiently as possible under all operating conditions. Turboshaft Engines There are many different models of this type of engine. The H-46 and H-53 helicopters are examples of aircraft that use this engine. 6-9 Figure 6-15.—Propeller assembly and associated parts.







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