Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The output gas temperature from the engines had to be below 400°C for the helicopter's stainless steel rotor ducts, so a bypass design was used. This also blew "cold" air from the compressor, rather than purely hot turbine exhaust. Rather than using an over-sized compressor with a bypass around the turbine (as commonly used in the turbofan engine), the Oryx used an auxiliary compressor in addition. This was mounted behind the turbine, with its gas flow in the opposite direction to the main engine core. The two air streams were deflected through 90° in a collector chamber, then exited vertically upwards.

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