I am building a ferry from scratch so I don't have any recommendations for motor size. The model is 144cm long by 20cm wide and will displace about 12Kgs.The hull has a flat bottom and is very boxy. It has two 50mm props on 30cm shafts. I hope to run the ship at scale speeds so the motors do not need to be fast running, just have plenty of torque. Can anyone help me?