I have had two
tanks out of my Corbin recently, here is a
photo I took as I was getting ready to put them back in. This is looking at the pilothouse floor after the
hull has been flowcoated. On the left side of the
photo (i.e. to stbd) I have marked a dashed red line which shows the lower extent of the Airex
core. On the right side of the photo you can see how that Airex
core sits on top of (i.e. inside of) the outer
hull GRP and how another layer of GRP is on top of that to form a sandwich.
That photo at the start of this thread is of a
plug of Corbin hull was taken from the class association website at
https://corbin39.org/faq/?Display_FAQ=4396 . As you can see in the
plug photo the outer hull layer is approx 10mm thick. That plug is fairly representative of the Corbin hull along this area.
(I've got some more detail on the hull
layup in that area, but I don't think it matters. I also have some info on the hull strength vs
current boat building recomendations. Again I don't think the detail matters, suffice it to say the
safety factor (FoS) is quite high. The original poster can come on the Corbin group facebook page at
https://www.facebook.com/groups/711494475930121/ if they want more detail.).
The hull on this Corbin has obviously deformed due to a few years of point loadings from the side in a hot climate, as opposed to either being evenly supported in the
water, or being supported from below via the
keel on land with only lateral restraint from props. I guess I now know how not to use a
hurricane pit ! (i.e. best leave the
keel onto something solid and taking the load).
My personal opinion from the information given is that the condition of the Airex core is mostly irrelevant. What is more important is whether there is any damage that should concern us in the outer 10mm of GRP. Given that there is apparently no cracking then I'd simply negotiate the
price down depending on my own personal feeling about these things.
This is the last-but-one Corbin ever built, you can read more about it at
https://corbin39.org/200-complicite/ . I hope she finds a good home, and I know the original owner feels the same way, she was gorgeous when he
sold her in 2017.
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