Sailboat Electric Diagram>sailboat Sailboat With Electric Trolling Motor?

Sailboat with electric trolling motor? - sailboat electric diagram>sailboat

I believe that with an electric motor to draw on my 13-foot sailboat. The boat weighs about 400 pounds. I use a narrow river, as the tide is 1 kilometer of the waterway where the candle. The currents are very strong. I read in the boats, which are much larger than I do 50 lb thrust electric motor. Is this a good choice for me?