Yesterday I was cruising my boat for about 3 1/2 straight hours and everything was running and handling beautiful......THEN all of a sudden I felt a little vibration from the back of the boat....I lowered my trim a little and all was good...then I thought my propeller fell off ...for about 3 seconds the engine rpm went up like there was no pressure from propeller...Then everything went back to normal when I lowered the trim some more and I rode it back to dock about 20 minutes away with no problem........what gives.......I am a newer boat owner obviously.....lol....please help out a dummy here..lol