For liquid or water pump:
Highest efficiency is the system: Piston and Crank .It is pressure but no flow.
Hydrophore or turbine has low efficiency and low pressure but they have flow.
Rotary piston has efficiency as Piston and Crank and he has flow as turbines .
Rotary piston brings the advantage Piston Crank System at the turbine.
YouTube - Rotary Piston Engine Tarnaveanu Emil
YouTube - Rotary Piston Engine Tarnaveanu Emil 2
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