Since second run, purchased new battery with more capacity, improved turning radius of motor by changing position of servo rod pivot, improved propeller with further sanding to change blade pitch, and reinforced motor mount to make it more stable, Did the best run on afternoon of 7/10/16 in a small, but deep stream, and managed to catch some fish in action with a digital camera! The fish were only spooked briefly by the motor speeding up, but otherwise didn't mind the boat moving around. The run time was about 10 min, giving sufficient time to move around the stream. The boat did pretty well against the slight current and moved smoothly at full power. The current did make it a bit tricky to turn boat, but changing direction of the motor made turns easier. As long as there was sufficient slack, the fishing line didn't impede boat operation (but have to watch out for entanglement in seaweed and sunken wood).