fallguy
Boat Builder
- Joined
- Dec 7, 2016
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I am trying to understand if PVC80 can be used in a build for bulkheads where M80 is the main hull (exterior) material.
The only obvious difference is shear elongation at break, and of course M80s thermal conductivity.
Is there any reason a full boat can't be built in PVC80? Is the elongation number the reason?
If you mix and match; it looks like perhaps the PVC would be fine for bulkheads and internals; as long as the PVC and the M are not both next to each other in the sun, for example.
Can I make some BH in pvc and some in M foam?
When I spec'd my boat, I didn't spec any of the bulkheads in PVC, but it looks like they would have been fine in PVC. I did spec all bases and other internals in pvc. Of course, what Gurit does is only makes the PVC80 panels 40"x86" vs the M panels in 48x96, so if you need something wider; you are force to do a join and who wants to do a panel join on a bulkhead that is say 44" wide to get 4", or would you consider doing a panel join on a bulkhead without a second thought, or would you join them the other way and run a join 44" instead of up n down at say 70"?
As of now, I have an excess of internal parts, but might be a tad short on full M panels so considering using pvc80 for bulkheads.
Thanks for any comments.
DATA
PVC vs M80 (all psi unless stated)
PVC,M80
density 5,5.3 lbs/ft^3
compressive strength 232,148
comp mod astm 1621-1973 14069,10340
shear 174,158
shear mod 4351,4240
shear elong 19%,58%
ten stren 397,234
ten mod 21116,10420
hdt 257,230 F degrees
thermal cond w/m-k 0.033,0.04
The only obvious difference is shear elongation at break, and of course M80s thermal conductivity.
Is there any reason a full boat can't be built in PVC80? Is the elongation number the reason?
If you mix and match; it looks like perhaps the PVC would be fine for bulkheads and internals; as long as the PVC and the M are not both next to each other in the sun, for example.
Can I make some BH in pvc and some in M foam?
When I spec'd my boat, I didn't spec any of the bulkheads in PVC, but it looks like they would have been fine in PVC. I did spec all bases and other internals in pvc. Of course, what Gurit does is only makes the PVC80 panels 40"x86" vs the M panels in 48x96, so if you need something wider; you are force to do a join and who wants to do a panel join on a bulkhead that is say 44" wide to get 4", or would you consider doing a panel join on a bulkhead without a second thought, or would you join them the other way and run a join 44" instead of up n down at say 70"?
As of now, I have an excess of internal parts, but might be a tad short on full M panels so considering using pvc80 for bulkheads.
Thanks for any comments.
DATA
PVC vs M80 (all psi unless stated)
PVC,M80
density 5,5.3 lbs/ft^3
compressive strength 232,148
comp mod astm 1621-1973 14069,10340
shear 174,158
shear mod 4351,4240
shear elong 19%,58%
ten stren 397,234
ten mod 21116,10420
hdt 257,230 F degrees
thermal cond w/m-k 0.033,0.04
