![]() ![]() This can be of two primary designs, a Free-turbine turboshaft found on the Pratt & Whitney Canada PT6, where the gas generator is not connected to the propeller. The propeller is coupled to the turbine through a reduction gear that converts the high RPM/low torque output to low RPM/high torque. Turboprops have bypass ratios of 50–100, although the propulsion airflow is less clearly defined for propellers than for fans. A higher proportion of the thrust comes from the propeller at low speeds and less at higher speeds. ![]() Consequently, the exhaust jet produces about 10% of the total thrust. Owing to the additional expansion in the turbine system, the residual energy in the exhaust jet is low. Propulsive efficiency comparison for various gas turbine engine configurationsĮxhaust thrust in a turboprop is sacrificed in favor of shaft power, which is obtained by extracting additional power (beyond that necessary to drive the compressor) from turbine expansion.
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