How many stages is the power turbine in the Trainer Helicopter?

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The power turbine in the Trainer Helicopter, Design Number 73 (TH-73), is a single-stage turbine. This design is integral for its efficient performance and functionality. A single-stage turbine allows for a simplified construction, which can contribute to improved reliability and reduced maintenance requirements compared to multi-stage systems. Additionally, a single-stage turbine operates with a straightforward configuration that still provides the necessary power output for the helicopter's operational needs. The choice of a one-stage turbine balances performance with efficiency, making it well-suited for training and operational purposes in this aircraft.