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by
David Pascoe |
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| From
Article
Surveying
Boats
With Molded Integral Grid Systems
Photos by David H.
Pascoe, Marine Surveyor
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This sailboat uses a premolded
grid that completely disbonded from the hull. |
The problem here was inadequate
tabbing which can be seen broken loose at left,
center and right of photo. Only the webs are glassed
while the longitudinal section (seen at top) is
not bonded to the hull at all. |
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The framing system in this
boat was reduced from a 4 stringer system to 2 stringers
because it was thought that the liner would provide
the needed extra strength. |
The liner broke loose and the
stringers started to fracture as shown in this photo.
The area of the break was completely obscurred by
the liner and was not discovered before the bottom
cracked open. |
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Bonding failures can sometimes
be difficult to detect. |
This broken liner bond was
only discovered by sounding because the break was
obscured by a dirty bilge. In this photo, it is
cleaned for purposes of clarity. |
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When full inner liners
are used, internal plywood partitions are usually
secured to the liner with screws. If the liner is
loose and working, it is very likely to result in
misalignment of internal components. In this case,
the large gap and shifting of a partition was a
dead giveaway of a structural problem. Further evidence
was in the form of screws backing out of parts fastened
together. |
Go to Article
First posted 6/08/97 at David Pascoe's site www.yachtsurvey.com.
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