I was logged in before as Lurcher but site was down and had to change, so after all the help and advise I finally managed to launch and have a go! boat is 15ft Dateline with 40hp Evinrude, went to slip myself about 2 hours before high tide, had to wait over 1 hr untill 5 people tried to recover a fishing type boat, the boat had wrong trailer and no winch! anyway the slip is very shallow angle, I reversed untill ball hitch was just in water, stood on trailer and pushed boat off (after attaching rope to bow ) I have no PTT and launched with engine down so boat went straight onto skeg and wouldn't shift after some lifting and pushing it floated, my rear roller was badly seized and I changed it next as had all the others, pulled boat round to side of slip where it's about 5ft deep, reached in turned key and it fired up straight away, paddled out away from wall and headed down river towards open sea, imagine my surprise and excitement when she motored away stern down but not to bad, as soon as I moved OMC control lever slightest distance I felt the push in my back, I went outside speed limit into open water and manuvered side to side to get feel and then opened up a bit, in an instant the boat just skidded along over water with no effort in what appeared to me to be flat instead of high bow in air as I see some, the push on near wide open throttle was quite scarry, my GPS was showing 37MPH, I have read lots of info on getting over the hump etc and planning but I never noticed any problem, she planned very easy just above low throttle, hull shape is wide shallow, with reversed chines, very steep rise at bow and almost flat underneath, this was maybe reason? after some 40 minutes there was a thump like going onto 1 cylinder, headed back to slip, and started to boat back on trailer, I had to take trailer off car and I was over waist deep putting it on trailer, but when I tried to hold trailer with boat on it ran down slip, had to get a long rope about 20ft to car to hold boat but then I couldn't lift engine onto tilt as water was to deep to get my arms down to skeg or prop, after getting soaked, cutting my left hand and splitting my knee open, I finally pulled it slowly up slip and had to tie it to ring on ground before hitching to car, throughly exhausted I'm desperate to get back out, I waited for all the help that was promised but went alone.many thanks everyone for now, JBD