In 1983 I sail a 48' Gaff rig ketch from Virginia to New Jersey. Hull, deck and bulkheads were ferro-cement. The hull was epoxy sealed and was as heavy as a wetted wooden hull.
The crete was porus and water would get in and the iron bar would rust, expand and blow chunks off the hull. They were massively heavy and took a lot of power and fuel to move. If they hit something they breached fast and sunk even faster.
That's with poured concrete before waterproof concrete was invented. The boats shown in the video are made of plastered concrete, which is as the video says, light as steel and almost as durable. Waterproof concrete is common nowadays in construction.
It's all about the additives that are used my friends. It takes some digging, but anyone can make waterproof concrete if they need to, it simply takes a good binder such as latex, sodium silicate, or a water based varnish. I'm not familiar with seacreate, but when working with regular concrete, those ingredients can be used to create a watertight material. 😊🌎✨
This was my very first thought as I watched. Not surprised at the concept of a cement boat…but of mason workers wearing their Sunday best and not once smudge on their duds. Lost all credibility for me.😂😂😂
That used to be the standard attire of British working men. Well into the 1980s, you’d see labourers wearing old and worn-out suits rather than coveralls or dungarees.
I worked in a Wroxham yard in the 1980s alongside some old boys like this - probably some of the last real artisan woodworking boatbuilders. They genuinely did dress like that whilst carrying out a lot of tasks.
Because, despite what this video says, they aren't that good. They are heavy meaning they cost a lot of fuel to move, they breach easily, and they degrade quickly (water seeps in through pours, rusts the steel bars inside causing them to expand breaking the concrete) most concrete ships have a "safe" lifespan of about 3 years, after that there is a "high risk but usable" period of roughly 2 - 10 additional years assuming you are maintaining the ship correctly. Each year the risk increases.
@@athingwhichexists that's with normal concrete, and concrete made like shown in the video is lighter than steel, seacrete has additives that makes it water proof, hell waterproof concrete is common nowadays. Plastered ferroconcrete is a great material for shipbuilding provided you're not a total dumbarse while building it
@@dinoslavski No, that is with Ferrocement, aka biorock, aka seacrete. While construction has improved increasing their "safe" lifespans. They still require excessively thick hulls, a large cross-sectional area, and utilize nearly twice the amount of fuel as wood or steel ships of similar size while having less of the structural stability that those same ships have and requiring far more maintenance. The main reason for use of Concrete ships is their cheapness to construct, that is about the only advantage they provide. It is because of that reason that we only see concrete ships from war-time rushes and from hobbyists.
@@athingwhichexists Now you're just spitting word poop, seacrete in the 60s meant concrete with polymer additives, not biorock, and ferrocement is plastered cement on steel mesh frame, hulls don't need to be excessively thick, as a matter of fact any owner of a ferrocement boat will tell you that their boat's hull is around 5cm (2 inches) thick. They don't use more fuel than other types of boats of similar sizes and they have as a matter of fact more structural stability than wood (there are stories of ferrocement boats hitting piers and piers being in worse shape than boat itself). We don't only see them from wartime rushes and hobbyists, as a matter of fact this very video shows proffessional boat builders building one and that is usually the case. Learn before you slander a perfectly fine building material.
These are good points my friends. 😊 Concrete needs additives and reinforcement before it can be impervious to water, and while these ingredients can be easy to obtain for the average homeowner, (latex paint, glass fibers, sodium silicate, and the reinforcing meshes (usually made of steel or a formed with a grid of ropes that are supported by a frame), it's not something that is so easily mass produced, although it can certainly be done. 😊🌎✨
In 1983 I sail a 48' Gaff rig ketch from Virginia to New Jersey. Hull, deck and bulkheads were ferro-cement. The hull was epoxy sealed and was as heavy as a wetted wooden hull.
"Do you know why a ship floats but a rock does not?"
checkmate, elf
". . . and will never need maintenance!"
And,
this bridge is for sale and can be yours today for a cool $1.2M.
The crete was porus and water would get in and the iron bar would rust, expand and blow chunks off the hull. They were massively heavy and took a lot of power and fuel to move. If they hit something they breached fast and sunk even faster.
That's with poured concrete before waterproof concrete was invented. The boats shown in the video are made of plastered concrete, which is as the video says, light as steel and almost as durable. Waterproof concrete is common nowadays in construction.
It's all about the additives that are used my friends. It takes some digging, but anyone can make waterproof concrete if they need to, it simply takes a good binder such as latex, sodium silicate, or a water based varnish.
I'm not familiar with seacreate, but when working with regular concrete, those ingredients can be used to create a watertight material. 😊🌎✨
@@dinoslavski water proof concrete was invented and used widely by Ancient Greece and Rome. So history is not your thing, that's ok ;)
They look happy
Sigh... do they really have to be wearing blazers while troweling on the concrete? There is such thing as taking decorum too far.
I guess appearances really matter.
This was my very first thought as I watched. Not surprised at the concept of a cement boat…but of mason workers wearing their Sunday best and not once smudge on their duds. Lost all credibility for me.😂😂😂
That used to be the standard attire of British working men. Well into the 1980s, you’d see labourers wearing old and worn-out suits rather than coveralls or dungarees.
I worked in a Wroxham yard in the 1980s alongside some old boys like this - probably some of the last real artisan woodworking boatbuilders. They genuinely did dress like that whilst carrying out a lot of tasks.
Release the Witch manhwha brought us here
it so did lol
Well, hey, the Soviets and a guy in South America made submarines from Concrete
this one too can become a sub, although not as maneuverable
What's the reason for not using concrete today as a shipbuilding material?
Because, despite what this video says, they aren't that good. They are heavy meaning they cost a lot of fuel to move, they breach easily, and they degrade quickly (water seeps in through pours, rusts the steel bars inside causing them to expand breaking the concrete) most concrete ships have a "safe" lifespan of about 3 years, after that there is a "high risk but usable" period of roughly 2 - 10 additional years assuming you are maintaining the ship correctly. Each year the risk increases.
@@athingwhichexists that's with normal concrete, and concrete made like shown in the video is lighter than steel, seacrete has additives that makes it water proof, hell waterproof concrete is common nowadays. Plastered ferroconcrete is a great material for shipbuilding provided you're not a total dumbarse while building it
@@dinoslavski No, that is with Ferrocement, aka biorock, aka seacrete. While construction has improved increasing their "safe" lifespans. They still require excessively thick hulls, a large cross-sectional area, and utilize nearly twice the amount of fuel as wood or steel ships of similar size while having less of the structural stability that those same ships have and requiring far more maintenance. The main reason for use of Concrete ships is their cheapness to construct, that is about the only advantage they provide.
It is because of that reason that we only see concrete ships from war-time rushes and from hobbyists.
@@athingwhichexists Now you're just spitting word poop, seacrete in the 60s meant concrete with polymer additives, not biorock, and ferrocement is plastered cement on steel mesh frame, hulls don't need to be excessively thick, as a matter of fact any owner of a ferrocement boat will tell you that their boat's hull is around 5cm (2 inches) thick. They don't use more fuel than other types of boats of similar sizes and they have as a matter of fact more structural stability than wood (there are stories of ferrocement boats hitting piers and piers being in worse shape than boat itself).
We don't only see them from wartime rushes and hobbyists, as a matter of fact this very video shows proffessional boat builders building one and that is usually the case.
Learn before you slander a perfectly fine building material.
These are good points my friends. 😊
Concrete needs additives and reinforcement before it can be impervious to water, and while these ingredients can be easy to obtain for the average homeowner, (latex paint, glass fibers, sodium silicate, and the reinforcing meshes (usually made of steel or a formed with a grid of ropes that are supported by a frame), it's not something that is so easily mass produced, although it can certainly be done. 😊🌎✨
日本人いる？😂