The paper outlines the necessity for flexibility in the coupling linkage of a turbine with a reciprocating engine driving the same shaft. A résumé of the history of the problem is given. The conditions which must be fulfilled for satisfactory operation and the details of the calculation to fulfil these conditions are discussed. For simplicity the design chosen relies on propeller damping to hold the torque oscillations within safe limits. Tests with and without flexibility in the turbine gearing are described. It is shown that the problem depends on the vibration characteristics of the system and that a solution can be made if the drawings of the rotating parts and a few engine indicator cards at different speeds are available.

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