Integrated engine pressure ratio

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The integrated engine pressure ratio (IEPR) is the ratio of the pressure at the core engine exhaust and fan discharge pressure compared to the intake pressure to the gas turbine engine. The IEPR is an engine indicator system unique to the Rolls-Royce RB211.

In most gas turbine engines the engine pressure ratio (EPR) is used instead, which is the core engine exhaust pressure compared to the intake pressure to the gas turbine engine.

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