Thread: what size aux outboard?

got a 7.5 on the back of my figlass dominator, 5mtr fiberglass.
with it on full noise I can get about 8 kmph on a flat calm lake.
an aux is there for trawling at low speeds, quite and cheap running. that they could get you home in a pinch is a bonus but I would rather rely on my main, than hope to have calm enough weather to trawl back to the ramp when the big motor shits it.
I have done plenty of fishing going to all sorts of far reaching spots with no help potentially for days, this is the first boat I have had that has a aux.
greg