Reinforcement of water turbine casing
Removable francis turbine seals
Renewable electrical energy
Resilient runner seal
Reversible hydraulic engine
Reversible pump turbines
Reversible pump-turbine
Reversible pump-turbine
Revolutionary engine
Ribbon drive power generation apparatus and method
River ocean turbine
River turbine
Roliq motor
Rotary float engines
Rotary hydraulic machine
Rotary hydraulic machine
Rotary hydraulic machines
Rotary hydraulic machines
Rotary joint
Rotary motor with counterbalanced torque arm