Sailboat Owner's Guide to Corrosion - Self-Corrosion (Collier 5)
- Thread starter Will Gilmore
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I'm rather familiar with Russian engineering. Definitely impressive stuff. So it depends upon what you want the hull to do. The problem with cored structures is they can be real light weight and stiff, but when they break, it's not pretty. Stronger is a vague term. I personally prefer steel for hulls. Long list of reasons. But certainly recognize the amazing qualities of composites. As long as they are sound, wouldn't turn most of them down..Just search for images of Russian engineeringSome impressive stuff, but it doesn't all make sense.
The ultimate hull is a cored, carbon (or even better, boron) fiber unidirectional layup. Use an aramid fiber (Nomex) honeycomb core for best results. It will be MUCH stronger than aluminum, titanium or steel and WAY lighter. Heck, even cored fiberglass panels can be stronger (and WAY lighter) than monolithic steel or titanium panels. Honestly, composites are just better for boat hulls. Maybe steel is still better for ice breakers.
I've designed with carbon fiber. Not as easy as one thinks. One problem is you can design it. But the carbon fiber manufacturers may not be making it.
dj
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,116
Talking about Carbon in boat design, in 2017 Bob Perry was commissioned to build 4 identical carbon fiber boats.
Here is the story from 48*North.
48north.com
Here is the story from 48*North.
The Perry Carbon Cutter Project - 48° North
This article originally appeared in the January 2017 “Boat Show Preview” issue of 48° North. There is something uniquely “Pacific […]
48north.com
I work with composites. No boat stuff, only aerospace but I sail so I pretend I know what I'm talking about
I probably wouldn't jump into composites for deep see pressure. There are probably significant challenges with cored materials under pressure. Even going up to 55,000 feet we need to keep pressure difference in mind and that is nothing compared to 6000 feet under water.
Since this is a corrosion thread, I will say that carbon fiber is treated with more respect than glass when it comes to corrosion. Fastening aluminum structures to carbon fiber requires careful planning. A layer of glass over the CF, then use interfay sealants between the parts, and corrosion inhibitor on the screw heads. Stainless fasteners through aluminum parts into CF panels does provide opportunities for galvanic corrosion which airframe manufacturers have learned a lot about over the years.
I probably wouldn't jump into composites for deep see pressure. There are probably significant challenges with cored materials under pressure. Even going up to 55,000 feet we need to keep pressure difference in mind and that is nothing compared to 6000 feet under water.
Since this is a corrosion thread, I will say that carbon fiber is treated with more respect than glass when it comes to corrosion. Fastening aluminum structures to carbon fiber requires careful planning. A layer of glass over the CF, then use interfay sealants between the parts, and corrosion inhibitor on the screw heads. Stainless fasteners through aluminum parts into CF panels does provide opportunities for galvanic corrosion which airframe manufacturers have learned a lot about over the years.
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I think I'm in loveTalking about Carbon in boat design, in 2017 Bob Perry was commissioned to build 4 identical carbon fiber boats.
View attachment 175476
Here is the story from 48*North.
The Perry Carbon Cutter Project - 48° North
This article originally appeared in the January 2017 “Boat Show Preview” issue of 48° North. There is something uniquely “Pacific […]
Titanium yields without making the noises that steel hulls makes when Submarine makes deep dives.
It was a multi-tube design [I think 3 tubes], in which the outer tube was Titanium. Staged pressure control in the "tubes' allows deeper dives.
Creaking submarines were tracked....
Jim...
It was a multi-tube design [I think 3 tubes], in which the outer tube was Titanium. Staged pressure control in the "tubes' allows deeper dives.
Creaking submarines were tracked....
Jim...
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,116
