On Oct 5, 12:02 pm, HK wrote:
Eisboch wrote:
"Wayne.B" wrote in message
.. .

On Fri, 5 Oct 2007 03:33:23 -0400, "Eisboch" wrote:

The thump I understand.
It was the after-thump shimmer and flexing that concerned me.

I think it has done the "thump" thing a few too many times and is
starting to loosen up internally. Not a good thing obviously, and not
a recommendation for older SeaRays that have been run hard. SeaRay and
a lot of other manufacturers use glass over foam composite
construction. Once the bonds between glass and foam start to break
down, the boat loses structural integrity very quickly.

Ahhh... that makes sense and certainly fits the sensation I observed.
The skin has become detached from the muscle.

Eisboch

This is also a problem on some boats with fiberglass over foam stringers.- Hide quoted text -

- Show quoted text -

Same problem can happen with any stringer material. Many of these
boats simply fiberglassed the stringers to the hull with one or two
layers of mat. Usually while the hull is still in the form. If you
keep pounding them the stringers will eventually loosen from the
hull. Particularly in the front where there is no other significant
weight to keep it together.