Today I went out on a local lake and the following happened. I was full throttle when I decided I was going to turn around. I let out the throttle and began to turn the boat around. I was in about two to three feet of water according to the fish finder. I had the boat turned around and began to push the throttle back to full again. Once I was at full throttle the engine seemed acted as if the clutch was slipping in a car. You could hear the rpm's going up but the boat was only moving about half the speed it usally does at full throttle and the boat was pitching up in the water really bad. For the rest of the ride back to the boat ramp, I had to keep it at half throttle of less. Can some tell me what happened. My grandfather which was not with me thought I may have hit bottom and broke the shear pin? Any help would be appreciated.