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Old 09-27-2015, 10:25 AM   #31
Northern Spy
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City: Powell River, BC
Vessel Name: Northern Spy
Vessel Model: Nordic Tug 26
Join Date: Feb 2012
Posts: 4,075
Quote:
Originally Posted by mahal View Post
So if built properly, a FC hull is better than other material? Fiberglass blisters, steel rusts, aluminum can suffer from electrolysis and wood rots. What are the negatives of a well built FC hull?

Water soluble chloride intrusion corroding the reinforcing steel mesh. Steel expands, and cracks or spalls off concrete layer. Concrete is strong in compressive strength, but not tensile strength.

Impact damage often has a 7:1 damage ratio. 3" impact on hull equates to a 21" area or repair on the inside of hull. Generally cracking. Modern polyurethanes can seal the crack but structural weakness may still be present.
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