Posted on 08/02/2024 11:16:26 AM PDT by Red Badger
Artist's concept of a ship with the CoFlow system
Looking like a set of bridge supports that were accidentally installed on a cargo ship, a new wind-driven system by startup CoFlow Jet promises to reduce ship fuel costs by up to 90% using stationary cylinders with no moving parts.
Between rising fuel costs and increasing government mandates requiring shipping companies to go carbon neutral by 2050, there's a strong push to increase the efficiency of cargo ships while reducing their emissions. One way of doing this is to take a page from the history books and readopt sails to harness the wind.
On the surface, that makes sense. Sails have been propelling ships all over the world for millennia and were still used for commercial transport until after the Second World War. However, there are two problems with sails that have pushed them out of the cargo market for all except the most local of niches.
First, traditional sails require huge crews. Something the size of the 921-tonne tea clipper Cutty Sark needed a crew of about 30 to handle the sails and the complex sheets and lines that controlled them. Compare that to a modern 196,000-tonne container ship that needs only 13 officers and sailors – and most of them are pushing buttons instead of hauling lines.
The second problem is that sails are completely dependent on the wind. If the wind is blowing hard enough and in the right direction, great. If it's blowing too little or too hard, or if it's blowing from the wrong quarter, that's not so great. If it's not blowing at all, you're not going anywhere.
(Excerpt) Read more at newatlas.com ...
You mean this one from 1926? The photos I saw twenty years ago were of newer vessels. Anton Flettner also designed a workable helicopter in 1942.
Well, in terms of why it’s not a perpetual motion machine, yes.
But the car-with-wind-turbine doesn’t have anything like the Coanda or Magnus effect. That’s what’s different.
“You mean this one from 1926? The photos I saw twenty years ago were of newer vessels. Anton Flettner also designed a workable helicopter in 1942.”
Those are Flettner rotors. The ones in the OP are NOT Flettner rotors. In fact, they don’t even rotate. You can not find photos because none have ever been built; only small experimental test models.
“You mean this one from 1926? “
GEEZ!
See the side of the ship! FLETTNER ROTOR! Read the article. It clearly states that these are NOT Flettner rotors.
“Our resident liberal cage rattler thinks this pie-in-the-sky is just great.”
Grow up. You can’t back up word you say. You are the radical trying to silence the truth via false personal attacks. Saul would be proud of you.
It says clearly in the article that the cylinders don’t spin. It is not based on the Bernoulli (or Magnus) effect . Here it is...
“The CoFlow Jet cylinders developed by Zha DON’T ROTATE. They draw in a bit of the air from the wind blowing across and through them and then expends it at another part of the cylinder.”
And here’s a good video of the Magnus effect.
This is not what they’re talking about. There have been several ship built on the Magnus effect (rotor ships) over the decades. The fact that they haven’t taken hold tells you all you need to know about their practicality.
Geez. Did you flunk fluid dynamics?
“They draw in a bit of the air from the wind blowing across and through them and then expends it at another part of the cylinder.”
A spinning rotor creates a pressure differential which produces the driving force. The ‘bit of air’ does not produce the driving force. It creates a similar pressure differential which then produces the propulsion force. Mechanics are different, physics is similar.
This same thing was proclaimed long ago as the solution to rising fuel prices and I believe there was even a prototype built and much hype about its first voyage about to begin and then nothing. I think I saw an articlebin a magazine so it as probably before internet.
“This same thing was proclaimed long ago as the solution to rising fuel prices and I believe there was even a prototype built and much hype about its first voyage about to begin and then nothing. I think I saw an articlebin a magazine so it as probably before internet.”
Not the same. This is new technology. No prototypes.
See post 126.
“See post 126.”
Please disregard post #126.
Step 1:
The Coandă effect (/ˈkwɑːndə/ or /ˈkwæ-/) is the tendency of a fluid jet to stay attached to a convex surface.[1] Merriam-Webster describes it as “the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops.”[2]
https://en.wikipedia.org/wiki/Coand%C4%83_effect
It doesn’t work. I remember seeing a Jacques Cousteau special in the 80’s where they had a sail boat on the same principal called the ‘turbo sail’ It doesn’t work for cargo ships.
I get really sick of you posting every utopian energy scheme you encounter. “may”, “might”, ‘could’
Yawn
Screw you & your utopian ilk. If this old tech worked, it would be in wide use. It doesn’t and its not.
“like solar, this gets promoted every few years.”
^
Such is so.
Another one is a huge kite.
(If you’ve seen kite-skiing, you know how effective wind is...)
Sails powered tall ships with an estimated one-hundred horsepower...
“Screw you & your utopian ilk.”
Take your meds.
“Sails powered tall ships with an estimated one-hundred horsepower...”
Your 100 hp is not realistic.
“It doesn’t work. I remember seeing a Jacques Cousteau special in the 80’s where they had a sail boat on the same principal called the ‘turbo sail’ It doesn’t work for cargo ships.”
Not the same principle!
“I get really sick of you posting every utopian energy scheme you encounter. “may”, “might”, ‘could’”
Looking at your vile posting history I suggest you go to counseling.
“Screw you & your utopian ilk. “
Your every post seems to be a complaint and/or vile personal attack. What is your problem?
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