A tangential turbine is adapted for receiving kinetic energy from a flowing fluid and comprises a supporting shroud, a rotating runner having a hub and a plurality of radial blades spaced apart on the hub, and a means for controlling the receiving. The finishes of the invention are comprised primarily of polymers that contain carboxyl groups, salts of carboxyl groups, or moieties that can be converted to carboxyl groups by some chemical reaction. The position offsets between the device and contactor are determined by a device-view camera during runtime and a contactor-view camera during calibration time. The capping material might include polyurea, thermosetting material, andor any other suitable material. Additional options involve an automated facilitator, windfalls to initiators, automatic payment initiation, multiparty aggregation and automatic agreement document generation.