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The Voith-Schneider Propeller is a vertical-axis marine drive whose spinning blades change pitch continuously, letting a ship generate instant thrust in any direction, like a helicopter rotor underwater. Super-maneuverable, perfect for tugs and ferries.

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860,761 görüntüleme • 6 ay önce •via X (Twitter)

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NASA is pushing the limits of flight on Mars – by spinning helicopter rotor blades so fast they break the sound barrier. A recent test at NASA JPL achieved Mach 1.08.
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NASA is pushing the limits of flight on Mars – by spinning helicopter rotor blades so fast they break the sound barrier. A recent test at NASA JPL achieved Mach 1.08.

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Installing a ship propeller involves precision alignment, hydraulic jacks, and expert divers or drydock operations. Each propeller—often weighing several tons—is custom-fitted to the shaft, ensuring optimal thrust and fuel efficiency. A true feat of marine engineering!
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Installing a ship propeller involves precision alignment, hydraulic jacks, and expert divers or drydock operations. Each propeller—often weighing several tons—is custom-fitted to the shaft, ensuring optimal thrust and fuel efficiency. A true feat of marine engineering!

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The most expensive spinning metal you’ll see: a $5 million ship propeller.
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Ever wonder how planes "change gears" in mid-air? It's all about the Variable Pitch Propeller! Instead of the engine just spinning faster, the blades themselves rotate to bite more or less air.
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Ever wonder how planes "change gears" in mid-air? It's all about the Variable Pitch Propeller! Instead of the engine just spinning faster, the blades themselves rotate to bite more or less air.

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The Pitts Sky Car was an unsuccessful aircraft designed for vertical take off, by inventor John W. Pitts Pitts filed a patent in 1924 for a propeller, "which will cause an immediate vertical lift of any aerial car to which the propeller is attached".
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The Pitts Sky Car was an unsuccessful aircraft designed for vertical take off, by inventor John W. Pitts Pitts filed a patent in 1924 for a propeller, "which will cause an immediate vertical lift of any aerial car to which the propeller is attached".

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“The most critical element is they lost the rotor system. That's what holds a helicopter up is the rotor blades through the main hub. When that goes away, you've got no control.” ABC News aviation expert John Nance breaks down the deadly helicopter crash in the Hudson River.
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“The most critical element is they lost the rotor system. That's what holds a helicopter up is the rotor blades through the main hub. When that goes away, you've got no control.” ABC News aviation expert John Nance breaks down the deadly helicopter crash in the Hudson River.

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So, I am tracking down whether Cuauhtémoc has a controllable pitch propeller or a fixed blade propeller. The type of propeller will help in determining what caused the ship to back down under power and have the allision with the Brooklyn Bridge.
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So, I am tracking down whether Cuauhtémoc has a controllable pitch propeller or a fixed blade propeller. The type of propeller will help in determining what caused the ship to back down under power and have the allision with the Brooklyn Bridge.

Sal Mercogliano (WGOW Shipping) 🚢⚓🐪🚒🏴‍☠️

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Absolutely wild footage, this is a real world engine failure in a MD500 (Think Magnum P.I. helicopter) over Kauai, Hawaii out on a tour flight. You’ll probably have to watch this a few times but the video starts out with the helicopter under power and then the engine sound goes silent. The beeping you hear is the engine-out audio beep to inform the pilot that engine power has been lost. This maneuver that pilot is doing is called a Autorotation and the way to think about helicopter flight, the engine is turning this big fan (rotor blades) on top of the body and sucking in air from the top and projecting it downward to overcome the force of gravity. When engine power is lost, you experience a reverse in airflow because now gravity takes over and the air flow is coming from the bottom of the main rotor disk. The only thing the pilot can really do is to make sure the rotors keep spinning by changing the pitch of the rotor blades through the use of the “collective” which is a lever next to the pilot’s left leg and it only moves up and down. The pilot has to manipulate the collective during an auto rotation to make sure the blades keep spinning. If the pilot pulls up too much on the collective, the rotor blades will bite too much of air causing a resistance and slow the rotors down. If the pilot doesn’t pull enough collective.. the blades will speed up and potentially cause a catastrophic failure. The other control the pilot has is called the cyclic. This cyclic sits between the pilots legs and and manipulates individual pitch of the rotor blades to tilt the rotor disk aka “big fan” and make the helicopter go forward, backwards, left, right. So essentially in this type of emergency, you have to manipulate the controls in a delicate balance because no matter what, gravity is taking you to the ground because the engine is no longer producing power. The pilot did an outstanding job here given the geography and limited amount of flat terrain to put the helicopter on the ground. Thankfully it sounds like no souls were lost and only one injury according to a news report (see the link below)👇 Of course there is a lot more to helicopter aerodynamics but I’m trying my best to put this in simpler to digest terms. Big thanks to Combat Learjet for sharing and definitely worth a follow!
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Absolutely wild footage, this is a real world engine failure in a MD500 (Think Magnum P.I. helicopter) over Kauai, Hawaii out on a tour flight. You’ll probably have to watch this a few times but the video starts out with the helicopter under power and then the engine sound goes silent. The beeping you hear is the engine-out audio beep to inform the pilot that engine power has been lost. This maneuver that pilot is doing is called a Autorotation and the way to think about helicopter flight, the engine is turning this big fan (rotor blades) on top of the body and sucking in air from the top and projecting it downward to overcome the force of gravity. When engine power is lost, you experience a reverse in airflow because now gravity takes over and the air flow is coming from the bottom of the main rotor disk. The only thing the pilot can really do is to make sure the rotors keep spinning by changing the pitch of the rotor blades through the use of the “collective” which is a lever next to the pilot’s left leg and it only moves up and down. The pilot has to manipulate the collective during an auto rotation to make sure the blades keep spinning. If the pilot pulls up too much on the collective, the rotor blades will bite too much of air causing a resistance and slow the rotors down. If the pilot doesn’t pull enough collective.. the blades will speed up and potentially cause a catastrophic failure. The other control the pilot has is called the cyclic. This cyclic sits between the pilots legs and and manipulates individual pitch of the rotor blades to tilt the rotor disk aka “big fan” and make the helicopter go forward, backwards, left, right. So essentially in this type of emergency, you have to manipulate the controls in a delicate balance because no matter what, gravity is taking you to the ground because the engine is no longer producing power. The pilot did an outstanding job here given the geography and limited amount of flat terrain to put the helicopter on the ground. Thankfully it sounds like no souls were lost and only one injury according to a news report (see the link below)👇 Of course there is a lot more to helicopter aerodynamics but I’m trying my best to put this in simpler to digest terms. Big thanks to Combat Learjet for sharing and definitely worth a follow!

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This technology has me curious. It's called Wind Sail Propulsion. It's still in the 1.0 stages IMO. It's kind of interesting though and could potential save on fuel costs to get things across the ocean. It harnesses wind energy to assist or, in some cases, serve as the primary means of propelling ships. Another technology is the Flettner rotor, which uses the Magnus effect—created by spinning vertical cylinders in a wind stream—to generate forward thrust. Unlike sails, the rotor is powered by its own motor, allowing it to generate propulsion even when wind direction is unfavorable. Do you see potential for this kind of technology? What kinds of potential problems could arise? 🤨
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This technology has me curious. It's called Wind Sail Propulsion. It's still in the 1.0 stages IMO. It's kind of interesting though and could potential save on fuel costs to get things across the ocean. It harnesses wind energy to assist or, in some cases, serve as the primary means of propelling ships. Another technology is the Flettner rotor, which uses the Magnus effect—created by spinning vertical cylinders in a wind stream—to generate forward thrust. Unlike sails, the rotor is powered by its own motor, allowing it to generate propulsion even when wind direction is unfavorable. Do you see potential for this kind of technology? What kinds of potential problems could arise? 🤨

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moulding casting machining this is a primitive propeller workshop in Dhaka, probably making orders for river ferries Pakistan and Bangladesh are full of guys like this; put them in technical apprenticeship for a year and you’ll have a heavy industrial base.
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moulding casting machining this is a primitive propeller workshop in Dhaka, probably making orders for river ferries Pakistan and Bangladesh are full of guys like this; put them in technical apprenticeship for a year and you’ll have a heavy industrial base.

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A helicopter’s rotor blades assembly. This is quite fascinating.
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A helicopter’s rotor blades assembly. This is quite fascinating.

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Gravity-defying robot! 🦎 VertiGo is a wall-climbing robot created by Disney Research and ETH Zürich that can transition between ground and wall. The robot can move on a wall quickly and with agility. VertiGo has four wheels, two tiltable propellers, and two tiltable propellers. One pair of wheels is steerable, and each propeller has two degrees of freedom for adjusting the direction of thrust. The choice of two propellers rather than one enables a floor-to-wall transition, thrust is applied both towards the wall using the rear propeller and in an upward direction using the front propeller, resulting in a flip onto the wall. P.S. Can you guess the year of development? 👀 ~~~ ♻️ Join the weekly robotics newsletter, and never miss any news →

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Propeller vortices are invisible corkscrews of air shed by spinning blades. They carry energy, cause noise and drag, and shape how efficiently a drone flies. Every prop is really making tiny, organized tornadoes.
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Propeller vortices are invisible corkscrews of air shed by spinning blades. They carry energy, cause noise and drag, and shape how efficiently a drone flies. Every prop is really making tiny, organized tornadoes.

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There is a pitch for a bold, new direction for the character..
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Watching the ferries, ships, tugs maneuver the ice is 👌⛴️ #whatisnewyork
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Watching the ferries, ships, tugs maneuver the ice is 👌⛴️ #whatisnewyork

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A majority of Californians believe the state is heading in the wrong direction—we need CHANGE! This state’s leadership has failed its people and it’s time for a new direction. Change is coming to California! ☀️
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A majority of Californians believe the state is heading in the wrong direction—we need CHANGE! This state’s leadership has failed its people and it’s time for a new direction. Change is coming to California! ☀️

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