srm wrote:
Manufacturing defects can cause them. Poor layup quality or inferior materials or construction can result in delam issues.
That's probably the least common cause - especially with older (pre-'84) Hobies. They were built like tanks and weighed accordingly.
srm wrote:
Also, over flexing, over stressing, or cyclical loading can cause them and are probably some of the most common reasons. Repeatedly sitting or stepping on an area or impact damage (which may not be readily visible at the time of occurrence) can lead to soft spots.
This is by far the leading cause of soft spots in the foredecks of 16s (from stepping repeatedly on them) and the deck area ahead of the rear beam on 17s and 18s (from the skipper's butt landing repeatedly on them).
Water intrusion, freeze/thaw cycles, over-tightening trailer straps, high temperatures, UV exposure all contribute to general laminate breakdown over time.
To make your boat last a long time:
- Don't leave it in the water for any length of time (more than a day or two).
- Drain the water out. Not necessary to get every last drop, but 99% out.
- If you sail in salt water, rinse frequently with fresh water.
- Store it in a garage or storage unit, or under cover. Even a carport is better than out in the open.
- Don't use the foredecks as a step.
- Don't let snow build up on it.
- 17s/21s - put a dollop of antifreeze in the wing tubes over the winter.
- Don't over tighten the trailer straps and don't use straps that go over the hulls.
The boats are made to take an amazing amount of abuse, but they aren't indestructible.