I would say max about 13 or 14 pounds with the prop he said. Remember you're using that 30% heli fuel. I used a gallon on my 91S. Really brings it to life, but only a gallon, I later went down to 15% after that one. It's just not the same. ut anyways the engine lasts longer with the 15%. It's gonna be very NOT EASY to come down to 15% after trying out 30%[8D]. Anyways, what airplane did or do you have in mind for that 180?
Victor