This MIT Propeller Is Going To CHANGE Aviation Forever!

This annoying noise represents inefficiency. However, by simply adjusting the shape, we can transition from the current state to a toroidal propeller design. Many see this as a breakthrough in aviation. Not only does it appear quieter, but it's also believed to enhance efficiency without compromising performance. But does it live up to its promises? And what other practical uses could it have? Let's explore.

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[phillyfanist]

The MIT study that resulted in this “groundbreaking” propeller design is actually more than a few years old. When it first came out, the Navy tested the props and found that there was not enough benefit to them for them to be adopted. The reason is this: being a fixed blade, while they give a slight efficiency boost, by design they are also limited in the rpm they can be turned at before that efficiency is lost. This might not be a big deal for large ships where the conditions they operate in are relatively stable, but when applied to aircraft, it introduces an additional issue: the pitch can’t be altered in emergencies or for descent, which can cause damage to the engine by overspeeding the prop. This was a common issue that led to a lot of crashes before the constant speed prop was invented. With a constant speed prop, you can feather the prop blades in the event of a loss of power, or reduce prop rpm while descending to help control airspeed. A toroidal prop being incapable of doing this would be a technological step backwards in aviation technology and is the reason why it’s not been widely adopted. It’s a novel design that will forever be limited to speed boats and recreational craft that can actually utilize its benefits.

[davidsusak]

My milkshake mixer has a similar blade. I bought it in 1984. 😂

[baritonebroker]

It’s totally Clickbait, because this is a story that keeps being re-released year after year after year as “new“. It’s not a new MIT design.

[christianbottger]

Why isn't there a single noise/sound sample from those new propellers in the video??

[fortesfortunajuvat]

One of the reasons there are fixed pitch propellers and variable pitch propellers is efficiency at differing speeds. Fixed pitch props are efficient only at a specific speed/performance range, which is why we have different fixed pitch props. Make one of those toroidal props able to be set for different speeds and you might have something.

[Anubis]

Been seeing these video's for ages.
I guess they got bored of the airless tires that will change the world, or was it the hubless wheels that will change the world, or was it the hydrogen cell that will change the world, or maybe it was the ionic thrusters that will change the world, or maybe it was the aerospike rocket that will change the world, or maybe it
Just like all those other concepts, these have proven to be impractical. The efficiency advantage comes at a steep cost. Real world testing has shown that they are just marginally better in one aspect, but require sacrificing far too much in other ways. The focus should be on finding applications that they are suited to and not pipe-dreams about changing things that they are obviously not.

[armedprophet]

This will NOT change passenger aviation due to the static position of the prop blades. However drones and boats may see this in use

[kc]

"Never let the truth get in the way of posting a clickbait video."

[tanagra]

Be careful, looks like your tip toeing into classified information here with submarine propulsion

[tsegulin]

Were toroidal propellers developed to reduce cavitation noise in submarines?

How can I change pitch with these propellers? Suppose I was flying a twin egine arcraft and one engine failed. How would I feather a toridal propeller?

[kevingooley]

Largest blade possible moving as slowly as possible, is the secret to efficiency.

[metalrain]

One problem I’d like to see addressed, a lot of plans don’t have fixed propellers. They have blades that rotate to allow better efficiency at higher altitudes. I can see it working with ships for sure, but unless you have a fixed prop aircraft it won’t really help out for commercial aircraft who the vast majority of have variable pitch propellers

[Mike-hrjz]

You 3-D print the first one then you make a high temp silicone mold, allowing you to pour aluminum into the mold. You will still have some polishing and machine work, but this should bring the cost way down. If not, can you take those silicone molds you fill them with carbon fiber And you’ll have some tooling and polishing but not much and with any aluminum tape substructure built into the carbon fiber working like rebar to Steffen it’s still will cost a whole lot less

[David-ifjz]

Boat propellers are a totally different animal than airplane propellers, its apples and oranges. Nice click bate though.

[chrisconklin]

I would be interesting to see a windmill application. Noise is a major problem. The only problem I see is swept area. Present windmill blades sweep large areas. To make a torodial blade with a larges sweep area might be too costly.

[chicketychina]

Best of luck with the variable pitch control mechanism fellows...
I'll check back with you guys in 20 years time. See how your getting along..

[markr.]

As a pilot I'd think that one limitation with this type of design is they could not make a variable pitch one. It would probably have to be a fixed pitch. Limiting efficiency at high altitude. They make planes that have constant speed props for a reason.

[mikedowd]

Major drawback: Toroidal propellers *cannot* be used for any application that currently uses a continuous rate proportional pitch propeller. These systems rely on an external control (automatic or manual input) to change the pitch of the blades to achieve differing amounts of thrust or reverse the direction of the flow. You find these proportional pitch systems on ships and aircraft.

[tamlynburleigh]

The toroidal propeller looks like two propellers bent at their ends and joined, so you get four times the surface area. There is a connection to the Archimedean screw too, I think.

[rustusandroid]

The problem is most propellers are not "constant pitch". You can't adjust a toroidal propeller for cruise or climb, thus in practice it will be more inefficient.