S (stall point): in this place the turbine velocity is zero and the impeller is rotating; the efficiency during the stall issue is bare minimum, all over fifty%, meaning that 50 % of the ability coming from the engine is missing by way of friction and dissipated as heat; at https://torqueconverterclutch86306.canariblogs.com/the-2-minute-rule-for-torque-converter-clutch-49107181