I'm looking at a disk of hull I just cut out. My trailer "missbehaved" and I have a spot of hull to replace about 1 foot below the waterline.
The piece I have here is just shy of 1" thick. Call it 0.95". About 0.12" for the outer skin, 0.10 for the inner, and 3/4" balsa. May not seem like much, but it's strong stuff!
I can't find the J30 laminate schedule anywhere. Found this for the Tartan 10 and imagine it's similar:
The laminate schedule for the hull is as follows:
1. A highly flexible Glidden gelcoat
2. 1 oz. mat (1 layer)
3. 12 oz. unidirectional cloth laid longitudinally
4. 1 oz. mat
5. 12 oz. unidirectional cloth laid transversely
6. 1 oz. mat
7. Balsa core
8. 1 oz. mat
9. 24 oz. woven roving (Fabmat)
The inner core on the T-10 looks a bit thinner than I'm measuring on the J30 but I could easily be off by 0.02.
Anyway, it doesn't matter that much, just curious I guess. Plan to put three layers of 1708 on the outside and two on the inside with some 9# balsa in between. Seem OK?
Indirectly related...the way the keel sump is bonded to the hull is amazingly heavy! Don't know what they were planning for, but you'd have to put a BIG hole in the bottom to detach the sump in a collision. Like 4 by 8 feet BIG. I bet you could drop one off a hoist onto a parking lot, pick her up, brush her off, and go sailing.
I am not volunteering my boat for the test.
