Outboard size?

[smokepoles]

I have a Honda 5 hp 4 stroke on my 19.5 foot aluminum. Wide open, it pushes the boat with four people at 4.5 mph measured with GPS. Will use less than a gallon of gas over 8 hours trolling. For reference, my 24 volt Minkota pulls the boat at 1.5 mph at half thrust. I will likely be using that more for trolling trout and kokanee as it is so quite and peaceful, but will drain too fast for doing the wiper thing at nearer 3 mph.
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