Hi all, I've uploaded some images of the indentations, and I believe they speak for themselves.
I didn't know non-cored fiberglass could become delaminated (I thought either the fibers or resin would snap/fracture first) but that wouldn't be so bad because then I could just perform a resin injection + vacuum repair, which I have the equipment for. I've also considered adding some reinforcing fiberglass (possibly with a core in between) to stiffen the area, but I worry about creating high stress areas around the perimeter.
In the interior you can see there is a fiberglass covered plywood sole, but there used to be another plywood 'floor' overtop of that which rotted. You can see the perimeter of it where I cut the tabbing flush with the hull. I don't believe it was structural, but a part of me is still not particularly comfortable with launching and sailing the boat without a new floor. I don't want to install a new floor, only to find that the hull deforms again after launch and messes everything up, or that I have to tear it off to perform a hull repair I could do now.
I've done some tapping with various objects to try and 'hear' delamination (would expect a dull, hollow sound) but I haven't noticed anything. Mind you this is while it is still sitting on the support, the rudder-lift was just a quick test to see if the glass would bounce back (it didn't). Maybe if pressure was taken off, the layers would indeed 'inflate'. In any case, I don't know what failed here. There is no core, therefore there is no rot. I'm essentially dismissing the possibility of water-related damage. There are no cracks, fractures, tears, etc... however it is soft. What on earth can create such symptoms (or lack thereof)...?
Edit: looking at those interior photos I really have to think to myself.. why in the world did they NOT tab that entire rear bulkhead to the hull, geeeez!
I don,t see a big problem here. the affected areas may in time return to shape.
However i would for sure be making much larger pads to the shape of the hull so as to add more support for next year.
Making a grp pad of the hull is quite easy to do and then fit the pads to the top of the support.
The way to make the new pads would be like this.
Apply several coats of wax polish to the hull in a large area around the new support area.
after polishing off each coat apply a coat of pva.release agent allow to dry fully.
Then start laminating layer after layer approx 16 to 20 layers should be enough.
because of the area to be moulded and the fact that the more resin you use on each coat gravity will for sure either slide it down to the keel or just drop off. use the min resin to glass ratio..
std polyester resin can be used for this along with chopped strand matting...
when cured ( next day ) peel of the new moulding and trim .
then fit to the top of the support post.
The larger the moulding the more support it will offer.