Helm Station I have -finally- (almost) completed the Helm Station. From the very beginning of deciding to build Unicorn, I intended to monitor every aspect of the propeller drive motor so I can get a complete picture of how the motor is performing. The gages on the Helm Station are: Voltage across the motor terminals Current thru the motor RPM Motor housing temperature Accurate low speed speedometer Battery voltage Note that the voltage and current are at the motor, not the battery. This will tell directly show how much power the motor is using. Combining that with boat speed, motor rpm, and motor temperature (and a lot of maths) I can figure out electrical losses and hence overall motor efficiency. I wanted to do this for two reasons. The first just to satisfy my curiosity, the second to have a starting point to compare the efficiency of different sizes of propellers and to see if and how much a Kort nozzle (also called a ducted propeller) as used on some large tug bo...