Question:
Can someone really make a boat out of concrete?
Tragic boating accident?
Would you have to dry dock it first then build it. I want to build a small catfish boat and want to make it out of concrete. It has to be super strong, steel will not work.
Answer by bigjim5551212
yes, they are called Ferro Cement boats. A friend of mine has one. .
http://www.ferrocement.org/
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It has been done before, most notably during WWII.
Yes
Yes…i think
Ferro-concrete boats have been around for years.read any sailing books,or just Google “Ferro-Concrete Boats”
Concrete boats are normally a little larger than one you would need for a personal boat for cat fishing.
Check out : http://www.ferroboats.com/
Good Luck – Boat Safe !
yes
Yes of course. In short – the boat is built on an armature of steel rod and mesh tied together and then plastered with a cement render and finished with a super tough epoxy inside and out.
I don’t know of any boat that isn’t built out of the water.
If steel is not strong enough conventionally this is just steel with cement on it and will not be stronger, or weaker particularly, just a different way. A small boat under 25′ could be equally strong in nearly any material, some will be much harder to sink than ferro or steel construction. There is a lot to be said for building light and strong to get performance and economy.
The goal is to have a well shaped armature on which the MINIMUM render is applied, once the steel is covered that is all that is needed, additional cement is excess and heavy, a normal hull thickness for a 35′ boat will be 15 – 19mm if skillful. The strength is in the steel, the cement is too brittle in itself. All mountings, rigging points etc. must be formed in the steel before rendering, the hull done correctly will be very strong but heavy, very soft riding and quiet. The ballast is internal to the keel, you can never have the keel bolts fall off! Ferro boats have condensation issues if not insulated, like alloy, steel and fiberglass. You will not find a massive saving over other materials, it is more to do with what you are familiar with, carpenters will feel comfortable with wood for instance, engineers with steel or alloy. Most ferro boats will have timber top sides anyway so it is a hybrid technique really.
This is a very basic description of the idea, you would consult a navel architect or a very well credentialed designer to supply or examine any design you find or come up with. If the steel framework is not done correctly the boat will fail, this is why this method has a bad reputation and is hard to insure – it’s because of overenthusiastic claims and hype that so many got sucked into thinking you could build a boat for pocket change, this resulted in some truly horrible and bizarre creations – and failures. The truth is it is just another method of building a boat, and has been used for at least 140 years. Dinghys were built in ferro with sides about 1/4″ thick to prove the concept, I believe they were very good if a little heavy, and had excellent handling characteristics.
Ferro floats as well as any house brick, and can be pretty quick to go down if something goes really wrong. It is really helpful to get involved in someone’s existing project, and get some hands on experience. There are plenty of groups out there, this one is good. http://www.ferrocement.org/
If steel won’t work, have you thought of a marine-grade aluminium alloy? As the “Sea Otter” boats.
This material has a laboratory-estimated life expectancy “in excess of 100 years”. It is used by the police launches on the Thames, the Swedish Navy and Life boats, so is pretty strong.
The hull needs little in the way of maintenance – doesn’t rust.
Yes – you can see one at Ellesmere Port Boat Museum
The archives there give information on how it was built…