Originally Posted by Grizzly-Winder
Yeah its not too bad on surface. But the transom moves unbelievably when I cut the power!! It looks like the motor is just going to pull off the back and sink.
I'll put up a pic of it as it is now. The exterior paint is just flaking off from the flexing in the fibreglass.
I'm away this weekend but as soon as I get a chance I'm going to do the test hole drilling. Those holes will be easy to repair but I know there's no quick fix here. This repair is definitely going to be a winter project. My fibreglass experience is limited to the windscreen I made for it after the original one crazed out then cracked down the middle.
The give way is the Aluminum backing plate to reinforce the transom spreading the weight over a broader surface area...I am surprised there are not the same on the inside.
In a way it is a simple fix but it is also a lot of work and put of it you have done if you have pulled the motor.
Remove the seats. drill all the rivets on the rub rail, remove the windshield and frame Carefully and store it well.
Pull the deck off the hull and store it flat.
Now look up Seacast Transom Repair or look up Transom repair with Plywood......Seacast will require the bad wood to be removed completely, some holes filled and new holes drilled later.
Otherwise with a cut off wheel cut the inside of the transom off and scrap all the bad wood out. Make a new Transom out of a couple pieces of Marine plywood and fit into the transom. Fiberglass and reinforce the new transom in place.
Good luck and I doubt you will find another Sidewinder hull in any better condition...Just spend the time fixing what you have and make it better than it was 40 some years ago.
Pride of ownership and having a classic old boat.