Getting on plane?
I have a 14ft skiff with an 18horse 4stroke tohatsu along with a friend who is 6ft 8in 360lbs. Now I don't know if this is weird or not but when he is in the boat we go about 11.5 mph unless we are running in water 4ft or less then the boat jumps right on plane and we cruise at 17.5mph but as soon as we drop off in to deeper water the rpms and speed drops back down and won't fully get on plane. Why is this and is there anything I can do to fix it? I have tried a couple different pitch props and have tried him in the front and the back but the results don't vary too much. Any info is appreciated.