Abstract: In the present invention, a right leg drive RLD monitoring system is employed on a medical computing system/computer, such as an ECG, HEMO and/or EP monitoring, mapping and/or recording system, that includes a number of RLD circuits to be utilized for different procedures or monitoring states to be performed using the system. The RLD monitoring system operates to actively monitor and/or record the feedback voltage to the RLD isolated from the patient. Using the measured feedback voltage data, the RLD monitoring system can identify and determine if the RLD circuit in use is approaching saturation, has reached saturation and the duration the RLD circuit was in saturation. The RLD monitoring system can concurrently and/or subsequently select and/or provide selection information regarding an optimal RLD circuit to be utilized to most effectively perform the desired function of the RLD in the procedure being performed using the monitoring, mapping and/or recording system.

Abstract: A propeller control system, including a propeller governor, overspeed governor, and a bleed valve, is provided to control the flow of fluid under pressure from a pump to an hydraulically controlled, variable pitch propeller driven by a gas turbine engine. Under normal operating condition, the propeller governor controls the pressure of the fluid supplied to the propeller, adjusting its pitch as needed to maintain constant speed operation. The overspeed governor prevents overspeeding of the propeller and engine in the event that the propeller governor becomes inoperative, and, in the event that both governors become inoperative, the bleed valve prevents sudden increases in fluid pressure, attendant with the failure, from adjusting the pitch of the propeller towards an overspeed position.