Hull canned inward
- Thread starter turk397
- Start date
Was it near the area the strap was sitting from the lift? If the strap isn't in the right place when you haul it can collapse the hull. I noticed this is your first post so have you had the boat long? Did the marina operate the lift or are you on a yard trailer?
I have seen that on other boats. Assuming it wasn't caused by the cradle or jack stands, either the lifting strap was in the wrong spot, the strap was not wide enough to distribute the weight (unlikely), or you have a weak spot in the hull. If it pops out and there aren't any cracks in the gel coat, I don't know that I would do anything about it except try to lift from a different spot from now on.
Seeing as how it popped back out on its own, this doesn't seem necessary, but if it'll set your mind at ease, go for it.
How's that for ambiguity?
Check for hull lay-up delamination in this area. If delaminated, then a proper structural FRG repair is indicated.
Use a plastic/phenolic hammer using constant force and speed to do the 'tapping' ... and 'tap-sound' the hull in this area -- from the outside.
Repetitively 'tap' the hull from areas that you know are not involved.
Keep tapping as you listen for the constant 'note' that the hammer produces as you move into the suspected area. If the (musical) note produced by tapping with the hammer becomes 'dull' or the 'note' lowers in pitch in the suspected area .... hire a surveyor to validate your findings.
Tapping across internal bulkheads, stringers or other 'structure' will produce a 'sharper' or 'higher' note ... and usually can be ignored.
Its the 'change' to LOW/dull notes when hammer-tapping that increases the index of suspicion for structure delamination in FRG composite structure.
Use a plastic/phenolic hammer using constant force and speed to do the 'tapping' ... and 'tap-sound' the hull in this area -- from the outside.
Repetitively 'tap' the hull from areas that you know are not involved.
Keep tapping as you listen for the constant 'note' that the hammer produces as you move into the suspected area. If the (musical) note produced by tapping with the hammer becomes 'dull' or the 'note' lowers in pitch in the suspected area .... hire a surveyor to validate your findings.
Tapping across internal bulkheads, stringers or other 'structure' will produce a 'sharper' or 'higher' note ... and usually can be ignored.
Its the 'change' to LOW/dull notes when hammer-tapping that increases the index of suspicion for structure delamination in FRG composite structure.