turbo-transmissions serve as a hydrodynamic link which converts a motor's mechanical energy into the kinetic energy of a fluid, via a torque-converter and fluid coupling, before producing the final rotary output. here, the fluid is driven through rotor blade canals at high flow-rates and low pressure. this is where turbo-transmissions differ from similar hydrostatic transmissions, which operate using low flow-rates and high pressure according to the displacement principle.