Fastest Concrete Jet Boat
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- Опубликовано: 2 ноя 2022
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#concrete #RCboat #speedboat 
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Custom concrete is typically used, silica fume and glass fiber with high air entrainment. Also use glass microspheres instead of sand. Concrete with a density of 800 kg/m³ can be made, this floats in water.
Exactly what I was going to say and glass fibers to make it have tensile strength.
Its called FERROCEMENT. in the early 2000s I owned a twin-hulled 30ft FerroCat, powered by 2 800 hp 8.5L Mercury Stern drives. She started life as a Catamaran Sailboat, and I strip it of everything pertaining to the sailboat. She had 2 4cyl Mercury inboard stern drives. By the time I was finished I had a Speed Demon, on plane on open ocean, I reached 75 mph top speed
Hey Peter try this!!
how about Styrofoam and glassfibre concrete 😂
@@WetDoggo
Then it becomes a polymer composite. Can be lighter than aerocrete or foamed concrete with superior strength but is not suitable for thin sections.
For concrete to cure to its maximal strength you need to make sure that the concrete stays wet for a few days. That is especially an issue with such thin parts as they dry out quickly. The reason is that the chemical reaction (hydration) needs water to work. If the concrete dries out, calcification starts and that creates just weak chalk.
They added sand
Calcification is what caused that condo complex to collapse in Tampa that’s down the road from my house
For anyone interested in more in depth knowledge about the magical building material that is concrete, I would recommend this great youtube series by @PracticalEngineeringChannel : ruclips.net/video/UOHURuAf5iY/видео.html
Exactly. Properly cured, it would've been much stronger. Still not ideal used like this. ;D
Yes the longer it cures the stronger it gets but if they used a plasticizer and a fiber glass filler which speeds up the curing process with the addition of additional strength then there shouldn’t be an issue with it cracking. Also the way they got it out of the mold was awful. It would be better to drill a hole in the mold and shoot compressed air into it to have it release
Make a glider and fly with it
Ok
Because he never flew in a selfmade plane
@@Zimmon375 "glider"
@@Zimmon375 🤓
Yes. Concrete glider. Maybe it's performance will help us inform a better "soft landing" performance model for economic monetary policy.
I am in Nashville TN area, a friend took me to the concrete boat races. It is an annual event with colleges competing with students from their concrete technology programs. They carry real people and are full size canoes basically.
its a thing in germany/switzerland aswell
Now water we gonna do?!
Fellow Nashvillian here. Where and when are these races?
@@mhartleroad It was in the spring I think they are held, Percy Priest lake is where I went, assuming they stay at the same area. Good intercollegiate fun, teams from various colleges.
@@mhartleroad Look up ASCE concrete canoe. 2023 is in Wisconsin, though.
My cousins built a 45' sloop in '83 out of marine concrete and then sailed it around the Pacific for the next 10 years. They said it was very heavy, but also quite stable in storms.
tf?
I live on a 39 feet 86 built ferrocement yawl
I knew someone who built a ferrocement boat that size, but I never heard him talk about it much.
Concrete boats where used during Operation Overlord to create a temporary harbour to supply ground troops. They worked so well the engineers had difficulty sinking them to create the harbour.
That’s not quite the story, there were two harbors made, A and B for American and British. Those harbors utilized caissons called “Phoenixes” which were giant concrete tubs, pump out the water and they float, fill with water and you have a breakwater or mole for offloading ships. Some of these caissons are still around today as they’re quite robust but they were designed to be easy to sink in place.
There were some sailing boats made out of concrete, I sailed on one myself. Maybe that could be an interesting test because then, weight is actually good for stability !
Built these in physics in 2004 after building solid fuel rocket engines and DeLevel nozzles to maximize thrust. Then, you guessed it, rocket powered concrete boats! Best day of highschool ever!
Even, beat the day we made Air Crete planes!
Fun Fact:
During WW2, German engineers were tasked with finding a way to patrol and protect waterways and river ports from Allied attacks. One way in which this was done was to take a concrete barge pontoon, add a wooden deck, engines, and a control hut. Then, on each corner, quad 20mm anti-aircraft turrets were placed, and supplied with a mixture of explosive and armor piercing ammunition. This proved a very slow but fairly menacing craft.
About 1:42, did you know that there was an experimental aircraft carrier to be made out of ice and wood? It was named project Habakkuk, and would be made of a mixture of wood pulp and ice lmao
1:30 I once had the opportunity to wreck dive on one of those WWI-era concrete ships, and based on what it looked like below the water, its primary cargo must have been septicemia.
Some cement used for tile work is formulated to be somewhat flexible.
If whipped up with air bubbles it might not be as strong but it will be lighter.
It's still a Portland cement based product so flexible and light is relative...
You should also try plaster.
At least bring some of that plaster like you make a cast out of , for an emergency patch , if you spring a leak , if you do a full size boat, plaster can set underwater
Here in the Netherlands you can buy a floating concrete house. Completely made out of concrete. They don't go fast, but they are extremely comfortable.
I didn’t know there were boats made out of concrete, but now I can remember times I’ve seen boats like these. Great video Peter, Steve, and Sam!
The next boat should be marble. Finding someone with a cnc router that is set up to cut stone and shape the out side and carve out the inside. Then a slab to make a nice lid with a rubber ring. The thing would be a cool!
Its really interesting to see that even with all the extra weight the boat still planes. I'm currently designing and working on a highly detailed, tiny 1:74th scale 3D printed RC boat that has a very badly designed and slow displacement hull and im planning on changing it to something like a deep v planning hull.
I know that the guys at our local Polytechnique build some stuff like that all the time. They mix in the concrete some styrofoam beads to increase buoyancy and reduce weight. They also add fiberglass fibers to the cement to make it a lot stronger. Once it's out of the mold, they polish the cement to a shine and wax the heck out of it. They also make toboggans in a similar way.
We made concrete roll up canoes and raced them at university in the early Nineteen Nineties. The trick was to make the concrete really thin. Thank you for the memories, entertainment and sharing.
Pretty fantastic work, guys! Well done! 😃
Stay safe there with your families! 🖖😊
Mix some shredded fibreglass sheets in the cement, your Boat will be a lot stronger
Peter is so creative! Thanks for the consistent uploads dude!
Totally agreed
We are now closer to taking the phrase “flying brick” to the next level
The inflation reduction act had me dying.
it's actually cool too when you add fiber glass on to the cement when it being molded it gives structural support on the cement
When I watch these videos I wish I could also build such things. It looks like total fun. 😄
I am certain I would have interesting ideas if I just would have the knowledge. 😁
Good video 🙂👍
Now do a rocket boat or a REALLY fast one. 😉
Always loved the rc boat videos that you made. I do have a video suggestion, maybe try a rc jet boat video. You can buy a kit online that has the esc, motor and the impeller tube with thrust nozzle that you could drop in a homemade hull. Anyways, keep up the great videos brotato chip!
Aircrete/foamcrete could float quite well, potentially. You can mix cloth, wood, glass, or carbon fibers into the aircrete/foamcrete, to give it a lot more strength.
another interesting idea is you could use foamcrete which is much lighter and in either case you can also seal concrete which might help with long term water resistance and surface quality
Never heard of concrete boats before, but they sound interesting.
I'm excited to see what you do with the Ranger Tug!
Great job Peter!
Oh boy, more boats with Peter!
I wonder if Air Crete would do any better? Great video Peter.
so cool! would love to see you guys make a big Concrete boat!
Instead of mesh try chopped fiberglass. Typically it's just bits of around 10mm long fiberglass strands. They get mixed into the concrete for pours that need to be incredibly strong, sometimes as a complete replacement for rebar. Saves time/$ on building rebar cages, and in some ways it is even stronger since the strands are mixed in uniformly instead of being basically one layer. Plus nothing for rust to attack!
Not sure what mix you used here (looks like gray Portland cement + sand, maybe a 2:1 ratio?), but there are much stronger mixes out there. Something like 1:1:2:1 of _Gray Portland Cement + White Portland Cement + sand + Fiberglass_ should give much better results. Do give your local concrete mixing plant a call before building the full-scale boat though, they would be able to help you way more as far as mixes/additives go. There are many recipes out there and the most common one is only 3000 PSI (takes 3000 lbs to crush a 1x1x1" cube), but they go to 6000 and maybe even higher.
And lastly, let the thing set for a while. Technically concrete is strongest after about a month, but it should not even be de-moulded sooner than about 2 days for something this thin.
Benford did extensive testing on ferro-cement panels made of different thickness/compositions.
One I recall, was a 4'x1'x1/2" plank propped up within 1 inch of it's ends where a sharp woodsplitter type blade was pressed down in it's middle. It ended up bending over 4" with over 700lbs applied to the blade before it broke leading to a PSI rating of 19,500 LBS, e.g. sufficient to sink into the the bottom of the Marianas Trench without imploding.
@@VigilanceTech Considering that 4000lbs is common for floors, 19.5 is... holy sh*t!
Beautifyl, just beautiful mate!
Great video :) Would be curious to see how you 'salt-water' proof everything RC inside the boat
I checked up on your channel today, it had been awhile. I then later had a notification for this. I can only imagine what you're gonna come up with next. Cheers.
Another great video Peter. I really like your aircraft videos because I grew up on a small airport (76-G)that my dad built. I'm 77 now and enjoy your energy. Thanks again Peter. Keep 'em Flying, floating, rolling and tracking❗👍😁✌🇺🇸🇺🇸🇺🇸🇺🇸🇺🇸
Hi peter ..I've had some experience in building concrete models ..I studied architectural design under a ship's architect named Richard serving ..about 50 years ago.... for the purpose of model building we used plaster cast material.. like the doctors used to use for broken arms ..this way we kept the weight down and could control the thickness of the hull .. it was already reinforced with a cotton cheese cloth .. then to seal it we used fiberglass resin ..of course nowadays I'd probably use a really good epoxy.. believe it or not .. this type of hull worked extremely well and was very forgiving ,sandable and fairly lightweight.. I also learned plank & frame building at the time .. I think I was around 6 or 7 wen I took those classes and have enjoyed model boating and rc ever since .. I hope that tid bit helps ..I think you'd be surprised.. another not to well known material that was nearly used to build an aircraft carrier was a mixture of water and sawdust that was frozen into a solid ..that was called piecrete.. that stuff is amazing..it held up extremely well to all kinds of artillery and gunfire .. and of course it didn't sink ..being ice ..look it up ..just for kicks
You’re brilliant brother. I just turned 24 but you give me inspiration to do the sings I’d think of doing when I had more dreams.
Peter, the famous friend-of-a-friend (back in the '60's) used to make a rowing dinghy every holiday on the beach. He made a sandheap mould, then spead chicken wire, mixed concrete, and spread it over the wire. Once set, the boat was turned over, remaining sand removed, and ready for use. At the end of the holiday, the boat was abandoned. Just a bag of cement, and a pair of oars in tge car!
"I got a rock."
Don't know if that quote was intentional, but it was great! XD
Outstanding!
I work making concrete sculptures using fiberglass molds and there are a couple things special about the concrete mixtures we use as well as how me pour them. First off as the mixture goes. It is important to use some sort of Plasticizer in combination to gain strength and flexibility in the concrete. Second the concrete should be thicker in a uniform sense….so a two part mold would be a better idea. If it is a quarter-half in thick all the way around you will certainly have less issues with it shattering.
Finally my monthly Peter video.
Loving the stock market commentary.
Amazing video bro
You should make an inflatable ultralight, like the old one that Goodyear used to make.
Placing a light mesh in the concrete will make it resist cracking. You might try fishing net type materials.
I like it! You just need to up your concrete game. I look forward to your next one.
Nice viedo and project just love your boat 🚢 videos glad to see it worked concrete who knew lol.
You should make a concrete plane, awesome video 👍
Anytime when u upload I'm always clicking it. You make awesome content but also stay true to your channel
"Chum Shot" is by far the best boat name ever.
I loled at the Charlie Brown "I got a rock"
If you want to try a cool composite for this sort of thing, try adding pva glue to the water in a plaster of Paris recipe, it has been a decade since I last used it, but I think as much as 50:50 worked well
I liked the transition at 1:28👍
Ps practical engineering did a really great video on concrete, if you plan to move forward with concrete ideas I highly recommend giving his video a watch, you'll concrete your concrete game like legends.
you can add threads or fiberglass to the cement mortar, then it will not fall apart not on water, not when pulling out of the mold.
Enjoy your time in the Keys Peter
It would be interesting to see how would a cement casting used in broken bones perform; where instead of using a rebar they use a plaster cloth/skrim pe. The boat would probably end up significantly ligther but I am not sure if it will hold up compared to the rebar mesh.
Charlie Brown. "I got a rock". Love it
Pretty neat!
I wonder if multiple layers of a low density fibre (Kevlar or even nylon or polyester cloth maybe) lay up would work better than the single layer heavier duty metal meshes
FYI the mesh will definitely still give the boat support, but it's not really doing the same thing as rebar. At least not how I understand it's use in things like bridges. The rebar is stretched, the concrete poured and cured, and then the tension released. Concrete is incredibly strong in compression, but very weak in tension. So by doing this the rebar is constantly keeping the concrete in compression, even on the underside of an arched bridge that is flexing from the weight of cars passing over.
You can use additives to give concrete some amount of elasticity. eg; You can use a small amount of used motor oil to keep it from cracking while it cures, etc, etc. Looks to me like you need to plaster in some wire framing and mix some coarse sand or screenings as an agregate. I would also think about scaling up the size a bit based on the minimum thickness you're going to want. At your current scale, the concrete doesn't look like it has any chance of being strong enough to stay together well. Metal filings will strengthen the mix also but will make it rust. You may need to anodize the metal parts to keep them from rusting away. Hmmm.Ground up plastic? Ground up rubber? Ground up vinyl? Cotton fibre? I also wonder what a portland and epoxy mix would do... (maybe start a fire! LOL)
Electrical rust proofing systems that most marine vehicles require to keep from rusting away:
If a wooden boat uses electrical systems on board, it requires zinc anodes or else the nails in the wood will rust very quickly and the boat will fall apart prematurely. Bet you didn't know that! I'm no expert on it but you really should look it up. Non-ferrous alloys would prolly be your best bet as far as structure for the concrete. And just so you know, stainless is NOT a non-ferrous metal.
P.S.
Most of the concrete with any thickness should be at the belly of the boat so it sits well on it's draw line. (the water line) You want a stable water line so it's not flying all over the place. I might even cement a stabilizer in place. A pump in case of a leak or swamping is also a thought.
Also you can color your concrete with dye or tempura powder... I was a fisherman in a past life...
You've officially cemented your place in the boat world :P
Was not surprised by the results honestly. You could give it a thing coat of epoxy use other types of cement with Styrofoam beads glass beads fiberglass etc to improve it to not only work better but work great
Alright, I'm subscribed now. The inflation reduction act bomb was beautiful
I love it! Concrete plane upcoming?!
Did you try using fiber reinforced cement? Better tensile strength
Your videos are so interesting. Still stoked I met you coming into the Air Force Museum in Dayton, Ohio! I was the goofy lad with the handlebar moustache working. Thanks for what you do :)
Aw, Toby in his little raft 👍
There are still some floating in my town's harbor as a breakwater, in Canada.
My neighbor used to make super thin concrete countertops and used glass fibers...basically chopped fiberglass to as aggregate to achieve low profile strength.
Very nice
LOve it, all of it, we love ya, have a wonderful day.
For something this thick you'd want to probably use something like "ferro-lite" (which has different kinds of fibers in it, like basalt, or steel wool). Ferro-cement boats only really come into their own with a hull thickness of about 1/2" or thicker, i.e. about 7 lbs/ft^2 which limits their minimum size to around 35', but above that, there's really nothing better for rigidity, impact resistance, low maintenance, economy, and believe it or not, lightness.
We not gonna talk about the dead diver?😂
Next 4th of July special exploding concrete boats just an idea kind of liked seeing that big explosion at the beginning. As always though a ton of fun to watch your videos.
Idea: Speedrun building a plane. Doesn’t matter what type, just build one as fast as possible.
Out of nowhere the guy pulls out a Ruger MK4 lol
One of the most beautiful pistols, and very quiet.
You're looking at this all wrong: You very nearly made the world's fastest submarine.
I'd love to see the rideable version, and to see you transport it lol
Rele is a beast of a boat
I’m going to guess the mass will make it less jittery at speed. I found this true with rc cubs -heavier flew with more stability
I would have gone with a fibre reinforced concrete, then it could flex too. a fun idea though.
Have you made an RC submarine capable of firing bottlerockets via the torp-tubes? That would be cool. The cement boats were an interesting idea but I think they would work even better with “styrofoam concrete”. It would have increased buoyancy as well as an overall lighter total weight.
I’m sure many have said it. Use some glass fiber reinforced concrete with sun 1/4” aggregate. You might just want to get some sand, cement, and shredded fiber and mix it yourself.
Could use carb clean or even something a little less noxious to melt the styro out of the shell.
You can replace up to 20% of your water w/ Latex (paint) or Acrylic (cement bonding agent) in cement, and it will make it less water permeable and lend it a tiny amount of tensile stremf.
Awesome 💚
But now you need to make concrete fly...
"I got a rock". LOL!
You can’t dislike this guy’s videos ❤
You should do a boat out of pykrete (ice and sawdust). It sounds crazy but there were actual plans in ww2 to make an aircraft carrier out of the stuff
We use polymers and fibers to strengthen thin concrete. I'm sure that would make your boat lighter and stronger. Peter can make anything fly..And now anything float..
If you make a full size boat, please hire someone who knows concrete molding. While it'd be funny to watch you sink, I don't want anyone to get hurt...
Showing this to my science teacher when he says concrete sinks
when I was growing up in the early 60's in seaside heights NJ there were several concrete row boats, they used chicken wire inside the concrete as reinforcement. they didnt last long for what ever reason