Full Feature Video: kzread.info/dash/bejne/dWVkusmomqvbZJc.html Also full credit to MIT and their fellow grad students for the basic design. I just used this for an educational video and to satisfy my curiosity, this prop was still heavily modified and different to accommodate the drone. These results are not entirely indicative of MITs real props.

@bleepbloopblop81

Жыл бұрын

Very interesting!!! Thanks for the videos!!

@1islam1

Жыл бұрын

​@@bleepbloopblop81 🔴 What Is Islam? 🔴 Islam is not just another religion. 🔵 It is the same message preached by Moses, Jesus and Abraham. 🔴 Islam literally means ‘submission to God’ and it teaches us to have a direct relationship with God. 🔵 It reminds us that since God created us, no one should be worshipped except God alone. 🔴 It also teaches that God is nothing like a human being or like anything that we can imagine. 🌍 The concept of God is summarized in the Quran as: 📖 { “Say, He is God, the One. God, the Absolute. He does not give birth, nor was He born, and there is nothing like Him.”} (Quran 112:1-4) 📚 🔴 Becoming a Muslim is not turning your back to Jesus. 🔵 Rather it’s going back to the original teachings of Jesus and obeying him.

@goranjosic

Жыл бұрын

​@@1islam1 why does every Islamic Republic in the world oppress minorities, women and people who think differently?! O_o Something isn't right here, on paper love but in reality pressure!

@BC-wj8fx

Жыл бұрын

Viewers must realise that quite often there is automatic audio processing which makes the quiet sounds louder and the loud sounds quieter to even everything out.

@77thTrombone

Жыл бұрын

Everything up to the "heavily modified" part was made clear in the video. Hopefully the MIT lawyers won't come after you. With no comparitive run of straight-bladed props, these did not jump out as quieter. I'm sure the acoustic devil is in the details-even the slightest variation can affect the results.

"These are supposed to be quieter" *jet engine drone roars to life*

@Dropship11

Жыл бұрын

Lmao lmao lmao

@East_Coast_Toasty_Boy

Жыл бұрын

More like a swarm of bees.

@cadneemountai2791

Жыл бұрын

Lower frequency tho

@BackYardScience2000

Жыл бұрын

To be honest, this guy can't get the propellers smooth enough, balanced enough, or uniform. In other words, he's not good enough and doesn't have the proper equipment to make the design good enough to actually work right.

@cl3anfpv618

Жыл бұрын

@@iCantEvenButtonsGaming did you really just say "perfected propellers" 😭😭

Proof that design spec doesn't matter if your manufacturing process can't deliver the required precision.

@ITX-EcoClass

Жыл бұрын

Are you saying my man's 3D printer ain't up to snuff?!

@jamiepierson7772

Жыл бұрын

Yeah the real ones are trash too, they just muted the sound in the video for their demonstration unlike his

@shadowkillz9606

Жыл бұрын

@@ITX-EcoClass yes

@Kylanto

Жыл бұрын

He said he modeled it himself, so we don't even know if he modeled it properly. In the paper, they specifically designed the shape to interact with the vortices it generates. It looked like the middle of the blades were thicker than in this video. This guy didn't even pronounce toroidal correctly.

@ThatOneGuyFromSchool

Жыл бұрын

​@@jamiepierson7772 you would know

“It’s supposed to be quieter than traditional propellers” Cue category 5 hurricane

@cantan111

Ай бұрын

they are made for boat impellers LOL inboard jet motors

@plebbin.

Ай бұрын

they are meant to put out 2x the pwer with 1.3x the sound this guy is an idiot

@lunchbox1553

27 күн бұрын

​@@cantan111 They're literally intended for use in drones to make drone based applications easier to be accepted in residential areas.

normal propeller: small handheld drill noises toroidal propeller: plays Flight of the Bumblebee

The design isn't the flaw here. It's the materials and manufacturing.

@zacharysherry2910

Жыл бұрын

The design really looks like an improvement overall

@anusual

Жыл бұрын

Thinking exactly the same

@FunDipFobs

Жыл бұрын

@@oslier3633 are you trolling? or… just not very smart?

@jameshenderson4094

Жыл бұрын

​@@oslier3633 the 3d printer isn't precise enough, it looks accurate but small flaws mean a lot at high rpm, the stock blades are very very purpose made, despite technically being an inferior design

@oslier3633

Жыл бұрын

@@jameshenderson4094 MIT used 3d printers. Also, precision just improves efficiency by a few percentages. This thing just sounds louder.

Idk why but I cracked up laughing with how he’s like “it should be quieter” and then when he starts to fly it it’s the loudest drone I have ever heard

@user-fy8nd6nz5w

8 ай бұрын

Residents of Kyiv can hear drones louder.

@the_undead

8 ай бұрын

One of the problems is this person almost certainly does not have a 3D printer that would be capable of the precision needed to actually make one of these propellers to function correctly, these theoretical propellers take advantage of very specific fluid dynamic properties, so if you don't get the design almost perfect then they're completely useless,

@alainspirit2565

5 ай бұрын

WAIT YOU YOU ARE A MOD FOR JAKERTOWN

@albetaylormade7400

5 ай бұрын

😂😂😂😂

@cubee4108

4 ай бұрын

i live on kyiv and that made me wheeze​@@user-fy8nd6nz5w

Would be interesting to see a comparison against 3D printed regular props

From a practical standpoint I will strongly recommend using a coating spray, even a clear one as opposed to nail polish because you will be able to achieve a thinner and more even coating that will have less impact on the balance of the propeller, lack of good balance on the blades may cause vibrations which in turn will cause more noise, reduce the aircraft's stability and potentially break the propeller over time because of the uneven load created on the blades.

If I recall correctly, their focus was on blade tip vortices and reducing the noise they generate. So to me the prop and all of its surfaces would have to be aerodynamically flawless, especially the blades edges and I think that is beyond the ability of a desktop 3d printer unless you intend to manually sand, shape and balance the blade to perfection during post processing. The nail polish would work to fill in the ridges, but you would need to dip the entire blade to achieve uniform cover and retain balance - the nail polish would also need to be self-leveling to fill in the ridges and provide a smooth surface and minimize sanding, balancing, and weight balance across all 4 rotors - when you're spinning that fast anything and everthing you can imagine will have a huge impact. They all work together to minimize noise while improving performance and efficiency, but the margin of error is very small.

@shable1436

Жыл бұрын

In other words they need to be molded not printed

@3DRC-707

Жыл бұрын

100%

@chandrasekharlimit4547

Жыл бұрын

The shape causes cavitation to occur in the whole length of the blade instead of the tip, which reduces the energy of shockwave produced which makes a quieter sound

@jeepmanxj

Жыл бұрын

It was mostly notable at higher frequencies as well.

@honkhonk8009

Жыл бұрын

The toroidal propeller was also explicitly designed to be 3D printed, which was the method they used initially to create it. I feel that depending on how you design it, it probably can account for the turbulence from all the rough edges

Its not quieter, but if you’re trying to scare someone away and they happen to fear bees…

@CK-wo1ly

Жыл бұрын

🤣🤣🤣🤣🤣🤣🤣

@arcticowl1091

Жыл бұрын

3d prints are not aerodynamic. This test is completely bogus and pointless

@epmcgee

Жыл бұрын

It doesn't hit the same frequency peaks, and they'd have to test actual decibel level to determine that but it does sound slightly lower. The main difference is this is a hobbyist trying to recreate something he saw without all the necessary data and equipment to do so. The design and tests MIT have done have shown a much larger decrease in sound. But beyond that, this design is simply more powerful. It pulls in a much greater volume of air.

@ericrebarchik4453

Жыл бұрын

Well, how do we know that? We need a comparison video

@cavedog1989

Жыл бұрын

Beads?

"These are supposed to be quieter" Drone: *sounds like a swarm of Bees*

I was not expecting to BURST OUT laughing

Instead of sounding like a drone, it now sounds like a bunch of *_angry bees_*

@kawaiiLorenz1995

Жыл бұрын

Sounds like hornet chase. 🤣🤣🤣

@7XHARDER

Жыл бұрын

This joke reminds me of that one trajedy... whats it called? Norm Macdonald?

@---------c5741

Жыл бұрын

Its actually suppose to sound like a military helicopter

@andrewgates8158

7 ай бұрын

Have it drop black/yellow marbles.

They sound about twice as loud. You should try ones printed on a resin 3D printer. They would be much smoother. I think it's the ridges that cause the noise.

@joshb6993

Жыл бұрын

To me it looks like the outer geometry of the props isn't anywhere near what is currently under development. He's getting waaay too much turbulence by the sound of them

@conorstewart2214

Жыл бұрын

ABS and acetone smoothing might work well.

@alexandergrimsmo

Жыл бұрын

@@conorstewart2214 Exactly what I suggested on another of these videos.

@justsomeguythatlikesart

Жыл бұрын

From what I recall the official design isn't actually out yet for use, can't remember. So it's probably a custom build that only looks the same. Probably why it's having turbulence.

@BC-wj8fx

Жыл бұрын

Automatic audio compression is one hell of a thing. You never know if what you heard was how loud it really was.

On the upside, an Angry Bee sound maker sounds like a Lawn prop

Watching with excitement and anticipation, waiting to hear how much quieter these fancy new propellers are.........✈️✈️✈️

Ah yes the final nail polish coating. The ultimate finish

@JPtheGamer650

10 ай бұрын

Ikr, why not just clear coat it? Like from an airbrush or simply an aerosol can.

@walkingweapon

10 ай бұрын

​@@JPtheGamer650I'm guessing the nail polish lays down thicker to fill in the layer lines. Smooth finish.

@TGiFoosday

9 ай бұрын

If I print stuff with PLA or ABS that needs to have a better surface or be made stronger, I coat the part with Plastruct Plastic Solvent Cement. It's a very thin liquid that melts the plastic a little before it quickly evaporates, making the part sturdier and prevents it from layer separating.

@illitero

9 ай бұрын

@@walkingweapon lays down thicker and dries quicker! hahaha I know things like this are born in communities for a practical reason, but at the same time it baffles me how consistently I'm seeing/reading instances of "smart" people doing "dumb" things without critical thinking or research - you know, using the intelligence that got them to that point to begin with, haha. They just _trust_ and awkwardly bungle through it. It feels like the same thing as watching people struggle with opening packages/unboxings or figuring out how something works, they're all fumbling impulse and no thought to _think_ and problem solve. I mean absolutely no disrespect to the guy making the video or anyone else, I admire expression of passion. But they're kind of like that one friend most of us have that are *always* closing car doors too hard, hahaha. They aren't _feeling, thinking, and reacting appropriately in the moment,_ they're just bad instinct/forethought from moment to moment. I don't understand how people can be so intelligent and interested in tech fields yet be so oblivious to physical reality. Anyway, I don't 3D print, but still speak from personal experience in expressing consistent dissatisfaction from trying to work with nail polish when thinking it would work for that exact expectation of smoothing out. I can't imagine that the added weight and globby imbalance are helping things after applying it with the nail brush in such short, stabby strokes like that. It may be a viable solution for impatient people working with small parts, but I have a hard time believing it works at all for this application. I wouldn't be too surprised if these issues contributed to the excess noise heard in the video. After the heat treatment, I presume that responsible application of a spray-on gloss coat would yield a considerably lighter, more even coating that wouldn't glob up to mess with balance and intended air effects of the design. Speaking of: the design he used and the design he showed are very different at the tips and it's killing me lol

There's no way that's quieter than regular blades .

It removes the high pitch frequency that can literally bust your eardrums.

bro got trolled into putting a loudener onto his drone edit: no edit

@ninocraft1

Жыл бұрын

loudest drone in the ends

@dp055

Жыл бұрын

😂

@dp055

Жыл бұрын

Loudener 🤣

@KingPhill87

Жыл бұрын

"Loudener" genius 😆😆😆😆

@gdominguez5520

Жыл бұрын

“Erharera to test it out”😂😂

FYI to anyone who's actually questioning if its quieter, just remember that the regular propeller was made of different material and designed for the drone, while the new style was 3D printed and is far from the perfect smooth blade it would normally be

@Deathblow85

Жыл бұрын

He wanted to compare right? So no these arent quieter

@JM-nm2ir

Жыл бұрын

@@Deathblow85He wanted to compare the designs, yes. However, the manufacturing method for the two designs was radically different and involved different methods, materials, and levels of refinement. If you want to actually compare the two designs to see which is louder you need to use a decibel meter and you need to properly manufacture the blades, which includes a lot of fine tuning for balance, smoothing, and blade edge shaping. As other have also pointed out, the toroidal blade is likely not 100% accurate to the design it’s based on simply because the specs haven’t yet been released. Even a small inaccuracy can make a huge difference in things like this.

@joshbarr118

Жыл бұрын

He also failed to mention they made many different variations and are still testing it.

@mightymarlin97

Жыл бұрын

​@@Deathblow85He wanted to directly compare the designs as the only variable. He couldn't, so the results don't matter

@Deathblow85

Жыл бұрын

@@mightymarlin97 so i think you actually understand, gratz! The test was broken, because he tested an trough and trough developed design with a not so tested one, and home made at that. So while I applaud this video and its creativity, the comments below it justifying the difference because of the materials used etc. Mean nothing to me, because it was like testing a round rubber wheel, versus a wooden square one.

were you testing their propellor? or the one you designed to look similar in fusion?

@Vikanuck

Жыл бұрын

Do you ask purposefully pedantic and rhetorical questions? 🤔 He showed himself 3D printing it ya goob lol 😄🤦🏻‍♂️

@knotsure913

Жыл бұрын

@@Vikanuck you missed the point while you were deciding which cute little faces to add to your reply. he kept using those words "their propellor". we all saw him print it, friend. the point was where did he get the model he printed? because he made it sound like he just made something that looked close and went with it. you probably found this video informative.

@ramseydoon8277

9 ай бұрын

​@@Vikanuck"do you ask purposefully pedantic and rhetorical questions?" Based on the available evidence, no, they do not. You might want to use a dictionary more often, friendo. There's nothing rhetorical about the questions they asked. And, given that the topic of discussion is aerodynamics & engineering & combined sciences & their real-world application, where it is necessary to consider and examine the minutiae and small details in an academic & scientific manner, what they asked was rather non-pedantic. Acquire a dictionary and incorporate it into your life.

This is one of my favorite episodes in the show. Finally having a conversation after all these seasons is exactly what i wanted to see, and the way everything went down was perfect

That sounds about 8,000 times louder

@darkhseid

Жыл бұрын

maybe because it was built with the wrong materials and techniques?

@gjallarhorn456

Жыл бұрын

Its not really louder. It's just a deeper tone vs a higher pitch. Would work better with diff materials and bigger, thinner loops

@AmAzingshortssz

Жыл бұрын

Who cares?🤓

@EthanJahnz

Жыл бұрын

@@AmAzingshortssz the point of these propellers is that they are supposed to be way quieter, which they aren't. Do you own a functional human brain?

@AmAzingshortssz

Жыл бұрын

@@EthanJahnz i dont👍

"Loud" propellers: *slight whistle* "Quiet" propellers: have you ever heard of the word hurricane?

@timothychevrolet3067

Жыл бұрын

@danny supersell have you heard of the triforce?

@murderlesson101

Жыл бұрын

Have you heard about our lord and savior postal dude?

@SweetT00f

Жыл бұрын

Have you heard of the high elves? Oh what am i saying, of course you haven't.

@davidmiles964

Жыл бұрын

"Loud" propellers: Now we FLY! "Quiet" Propellers: WE WILL BATHE IN THE BLOOD OF OUR ENEMIES!!!!

@woottastic

Жыл бұрын

Have you heard the tale of Dath Plagueis the Wise?

Gotta use the wishbone props that zipline made

You didn't make it quieter, you made it angrier

that might be the most fearful sound u hear in the future

@hellcrow539

Жыл бұрын

Unless your aiming is on point 😁

@LeviAckerman57551

Жыл бұрын

Hahaha

@daniel8181

Жыл бұрын

yeah mit is trying to help kill a lot of people.

@schlobster3929

Жыл бұрын

@@hellcrow539 aim wont matter if theres a swarm of them 🫡

@TunnelSnake-es7tu

Жыл бұрын

Lots of ammo required

You might also try to 3d print a set of replica props that are the same dimensions as the stock props, and compare the 3d printed toroidal props with the 3d printed stock replicas. Just for a more controlled test.

@conorstewart2214

Жыл бұрын

Or print the toroidal props out of ABS and acetone smooth them to get a very similar finish to the stock injection molded props.

@maksrambe3812

Жыл бұрын

​@Conor Stewart isn't that what he did? The nail polish remover is acetone.

@alanhat5252

Жыл бұрын

@@maksrambe3812 he didn't say he removed the nail polish

@NoExceptions109

Жыл бұрын

this^. a control would make this test way more useful

@Acidburn1155

Жыл бұрын

​@@maksrambe3812the hell are you talking about nail polish is acetone? That's absolutely not true lol. Acetone is sometimes marketed as nail polish remover but I'm fairly certain a solvent wouldn't make the best nail polish

For this type of thing it is better to use a resin printer, it leaves the surfaces very smooth

Homers face when bart says you are the living end 😂

3d print yourself a pop filter for that mic man holy shit

@calebcruz2812

Жыл бұрын

💀

@MrTrevortxeartxe

Жыл бұрын

Lmao true 😂

@_..-.._..-.._

Жыл бұрын

MIKE- 3d print a giant rose stem and lower yourself onto it, friend.

@oluwaseyioyefeso5927

Жыл бұрын

AYO 😭

@Niko_Malthus

Жыл бұрын

🤣🤣🤣🤣

Given the ridges on the props they're substantially louder. Smoother and more balanced blades will yield better results and quieter performance

Sounds like a “slightly” less angry swam of bees. 😂

Love these kinds of videos keep it up

Sounds just as loud

@thelespauldude3283

Жыл бұрын

They sound frequency is lower so its quiter from the distance

@vanceagher

Жыл бұрын

@@thelespauldude3283 though the sound will penetrate walls better. One reason I like my props is that they are so high pitched even the slightest obstacle blocks a lot of the sound

@beaclaster

Жыл бұрын

it sounds cooler tho

@MDM992

Жыл бұрын

if not louder~

@dolbyprologicii

Жыл бұрын

@@thelespauldude3283 isnt it supposed to be the opposite?

The new propeller legitimately sounds like an angry swarm of severely pissed-off yellow jackets..... I'll never forget that sound! It happened to me twice last summer and three times the summer before that. That's what happens sometimes when you rome the woods mushroom hunting....😅

@Oatskii

Жыл бұрын

Looks like you got a little more than you bargained for 😂

@jorynickila7760

Жыл бұрын

@@Oatskii Isn't that how it usually happens?

@RokU5

Жыл бұрын

Carry a racquet…

@MichaelSHartman

Жыл бұрын

My sympathy. You can wait until they calm, or evening. Pour a cup to pint of gasoline in the hole, and put a sealing rock over the hole. After several minutes you can light it if you want. Yellow jackets are gone, and nothing will hatch. I do this in the yard where I mow, not in the woods. Don't light the hole around dead leaves.

This should be titled, "professionally manufactured propellers vs whatever I made."

@tomcoryell

Жыл бұрын

🤣🤣

I've seen genuinely quiet drone propellers where the blades are in a kind of tuning fork or wishbone configuration.

Sound like Batman is in town flying over Gotham 😂

I love the the coating of nail polish probably to help with the hardening literally something I would do 🤘🏻

@DaveOganesyan

Жыл бұрын

No. Don't use nail polish. How do you even picture a uniform application of it using a brush?! Better use a spray coating of whatever brand, you'd be able to achieve a result much more uniform than that.

While I get that people found the new props louder, it is important to not that its more basey. Ive worked with drone design before and sometimes we would choose props that sounded less high pitch since they were less annoying and blended better with normal sounds humans hear for from a distance.

Honestly, the difference I can hear is that the new blades sound like a swarm of bees is coming for you.

@Rottypops

Жыл бұрын

Swarm of bees are much quieter after they sting you to death

You read about a scientific study and with no outside motivation or help. You replicated it to the best of your ability! Dude this is incredible! Good for you. Hope you keep this up, this personal interest in science and the world around us.

@mikeyp0131

Жыл бұрын

Honestly it’s not hard at all to replicate something on a 3D printer

@Jordan-rb28

Жыл бұрын

Not that impressive, especially when he did it so crudely, which made the props even louder

@kuzadupa185

Жыл бұрын

@@Jordan-rb28 you must be a lot of fun to the parties you're not invited to...

@kuzadupa185

Жыл бұрын

@Mikeyp0131 the world's filled with people who like talking about how something could be done, or worst, how easy it is to do this or that, but there are far fewer people who DO the thing.

@tomcoryell

Жыл бұрын

@@kuzadupa185 thank you! IOW, anyone can be a critic…..

Bru that’s sounded like when a dad sneezes

Sounds like whole bunch of angry bees.

James Dyson: **laughs in 120,000 RPM**

@fleurimondproductions2786

Жыл бұрын

😭😭😭😭😭😂

@MadScientist267

Жыл бұрын

🙄

Honestly sounded at about 30% louder for the first split second. There was a much lower frequency though and that would have a tendency to stretch much easier as it dissipated through the air, effectively rendering any sound dead at a certain distance.

@parthawijaya482

Жыл бұрын

Sound like a fly near my ear

@domosrage5434

Жыл бұрын

Which is impressive since he built an inferior version lol Now imagine what it'd sound like if it was made properly?

@sunvetr

Жыл бұрын

Low frequency sounds travel further than high frequency sounds...actually.

@zacharysherry2910

Ай бұрын

@@sunvetr that's why my stepdad thinks he's not deaf now lol. He can only hear the low frequency sounds. He has the hearing ability of a tree.

Normal propeller: *Mosquito noise* MIT propeller: *Bunch of wasp trying to attack you*

He is like these are P with the loudest p in the world 😂😂 💀

If you were going for the loudest small package to scare the the hell out of every living thing walking on this earth then I believe it was a success. Congratulations!!!

Sounded allot louder than the original blades

@DinoAlberini

Жыл бұрын

That’s what I thought, but it could have been just sound compressed differently. He should measure it properly.

@MrIzzy5466

Жыл бұрын

The problem is that it's a rough, 3D printed propeller vs a smooth, manufactured propeller. It's not a fair comparison at all.

People don't seem to understand how these are quieter. They are quieter when further aeay because the higher pitch of sound they produce drops off quicker than the regular hum of a standard blade. This makes them quieter when in the air. Not when on the ground or near someone.

Sounds like thousands of bees surrounding me

That was significantly louder.

Someone was smoking dead bugs. Those are 2 to 3 times as loud.

@RealShaggy

Жыл бұрын

Well of course they are Albert Einstein, they were 3d printed lol.

The rpm of the motor was much lower at takeoff. Meaning battery life will double.

A weight difference before and after coating might be helpful here.

I appreciate a guy who understands the many different applications in which nail polish can be used. It’s also perfect for stopping yarn and fabric from fraying 👌

@cathuman5463

Жыл бұрын

It’s crazy stuff. Spilled some at a Boy Scout camp once and paint thinner was not cutting it.

The General Electric Quiet Blade, developed in 1934, is pretty much the quietest blade you can find. Unfortunately, due to its broad size, it likely wouldn't work well as a propeller for an air vehicle. I believe that propellers are typically very slender so that they don't act as a sail or wall when they aren't pushing. The Quiet Blade, however, starts as a point and progresses to a blade scoop, and the blades overlap, though that isn't exactly essential for quietness, but it contributes a lot. Most modern fans, etc., do not use this blade, and so they are loud, obnoxious, inefficient. The Quiet Blade also pushes a lot more air than many other fan blades, and lacks all of the turbulence of other more basic blade designs. ILG of Chicago also made use of this blade a lot.

@thebandplayedon..6145

Жыл бұрын

That was surprisingly interesting considering the topic, Cheers

The top end of the noise was gone, which is what mit was looking for. They were trying to make it quiter upclose obviously, but they were trying tomake it silent from a distance

These (roughly manufactured) props sound like a swarm of extremely pissed off bees.

I’d love to see this tested again after printing the props from an SLA/DLS (resin) printer like a Form2 or Form3

get this man a pop filter

@reportedstolen3603

Жыл бұрын

😂😂 yooo I’m weak

might actually be louder, but lower in the high-end, which equals slightly easier on the ears.

@Bl4ckD0g

Жыл бұрын

That's pretty much been the case every time I see these. It just cuts the high end noise down so it isn't such a piercing whine.

It sounds like swarm of angry caffeinated bees

that toroidal propeller sounds louder than the regular ones if you ask me

@MangoMotors

Жыл бұрын

But thats because the making of it is not perfect. Not only is the design simply a guesstimated imitation (MIT did not release the proper dimensions and specs), the materials and manufacturing of the wings are also not the same (which can have a massive impact on something like aerodynamics).

@gregorykusiak5424

Жыл бұрын

There is another video on the ‘Tube where someone compared the frequency spectra of the stock prop to their toroid - the toroid appeared to have reduced some of the more irritating and difficult upper frequencies. There was no correlation between reduced noise and flight duration, implying reduced drag or energy usage. I’d like to see how a toroid prop increases range/endurance, climb rates, max altitude…these types of thing.

Military drones are really loud so anything to quiet them would help. Patrolling and hearing wirring all of the sudden at 2am is quite the experience and really puts you on edge especially when you know it has thermal

@theRPGmaster

Жыл бұрын

I also think the new propeller design made less noise (even while being 3D printed), the video is misleading because the microphone normalizes loud noises, and if it's loud enough, it'll clip, which it sounds like the first one did.

Makes it sound like a giant, angry bee. 😂

When Nick comes a knockin the Cane Corsos tail start a waggin

It would be interesting to mount these on a drone that has a more open interface that allows the operator to view the voltage being used by each motor and to compare which one uses more battery power...

@alanhat5252

Жыл бұрын

or simply set it to hover & time how long it takes to fall out of the sky.

Do you have two print heads on the same printer to print duplicates? That's awesome!

I'd be interested to see how this prop stands up against cobwebs, branches etc.

WOW I turned up the volume to listen to the end 😳 dogs were kinda spooked

This whole thing is kind of blown out of proportion I think, the actual paper from MIT shows that the noise reduction is honestly kind of negligible. It's only a small amount of high frequency noise that was eliminated, none of the loudest sounds that traditional propellers make are really reduced. Not much of an improvement considering the design also looks like it would be heavier than traditional propellers.

@honkhonk8009

Жыл бұрын

The main advantage is the fact its designed to be 3D printed, and is more efficient. The fact its 3D printable alone, is good enough for me. That unironically opens the doors to alot of stuff

@slvshy666

Жыл бұрын

@@honkhonk8009 I could see how it would be fun to tinker with, but fail to see how it's more efficient when the only difference in operation was the noise level. And it has a larger surface area without being much thinner so it's not more efficient unless the actual performance is better, which they didn't really seem to touch on.

@alanhat5252

Жыл бұрын

3dB increase is double the perceived sound

For future reference: we in the gunpla hobby have this stuff called “tamiya extra thin cement” which comes in a small glass jar. It is specifically designed to bond both abs and PLA. It’s much less dangerous to your product than nail polish and stinks far less. A standard size jar has lasted me more than a year, but I bet your mileage would be far less with a 3D printer. We also have “godhand” nippers which makes your creality $5 nippers look like a joke.

This knocked my socks off 😂

God damn those propeller's sound like angry hornets

Watched another tuber try this with pc fans. Would love to see the actual MIT design to see how a refined design compares to peoples renditions of the model based on a photo.

@joshb6993

Жыл бұрын

The outer geometry looks waaay off...

Bro really thought he was gonna 3d print ground breaking technology on his desk 100/10 for effort though 🗿

They are very similiar Because the normal propellers are vrey well manufactured to less than 0,1mm deviance and are very smooth etc The 3d printed proellors, if oyu go down to the microscopic level, even with nailpolish are gonna be 100x rogher, whcih is why they are way louder thant they should be.

@tee1532

Жыл бұрын

the real propellors were literally 3d printed too

@JM-nm2ir

Жыл бұрын

@@tee1532But there was also a great deal of time, effort, and money spent to produce machines that could refine that 3D printed raw product to be a smooth and properly balanced blade with the desired chord and AoA. Besides putting nail polish on his homemade ones, there doesn’t seem to have been anything done to rebalance and actually smooth out the blades, let alone actually working to ensure the specs matched the actual design in lengths, angles, chord, etc.

"supposed to be quieter" *roars like a swarm of 10000 bees*

Annealing is the process of 'Softening' a material. If you want to add hardness to a material, the process is called 'Tempering'

Sounds the same lower pitch.....

@thecaybob1

Жыл бұрын

they're quieter from further away, they produce less high frequency soundwaves from the normal ones

You need a sound meter comparison ... and also it would be interesting to somehow test whether they give you more fly time by being more efficient. Of course, it's hard to do an apples to apples compare on standard vs toroidal blades as far as length/weight ...

Needed a fluffy mic cover for the video too. The wind noise is dangerously loud for anyone wearing earphones/headphones.

1. Sounds like an Average RC truck 2. Sounds like a Swarm of Bees

I think it's louder

Just because you heard MIT doesn't mean there are no time-wasters over there.

I nearly fell out of my chair expecting this quiet smooth takeoff...but...

I felt the wind from the second propellers lol

Unless you are getting extra thrust or battery life, it is actually somewhat nice to hear the quad when it is flying. You can estimate where it is and also there is something that gives goosebumps about hearing the screach as you rip the sky

@cjwrench07

Жыл бұрын

The MIT design is quite a bit more efficient, when perfectly balanced/smooth/designed/etc.. The lessened sound is mostly in the middle of human speech, so the range estimation frequencies aren’t touch.

@XiaolinDraconis

Жыл бұрын

You want goosebumps just think of all the children a silent drone could bomb.

@conorstewart2214

Жыл бұрын

@@XiaolinDraconis drones don’t need to be silent for that. Just drop a bomb or rocket from high altitude and they will never know the drone is there. Or just use munitions that go over the speed of sound, you wouldn’t hear it coming either. Stop with the scaremongering around drones it is ridiculous.

@conorstewart2214

Жыл бұрын

I think the point is not for recreational drones but more for commercial or cargo usage. Like if you are using a drone to record an event or to survey a building or carrying cargo, you would want it to have the least impact on people around it so reducing its noise is a good idea.

@XiaolinDraconis

Жыл бұрын

@@conorstewart2214 yeah but traditional drone bombings don't capture that delicious close up of the terror on their faces the second before the blast.

"These were designed to be quieter, but the margin of error is very small." No worries, real world error and wear and tear have never been *critical considerations for engineering.*

I like everything in this video!!

Kinda just makes it sound like one big ass angry bee

I think a high resolution resin printer is what you need brotha

You need to use a decibel meter onscreen as both of these are taking off. Because recorded all video maybe automatically self-leveling. I use an app called sound meter that just present simple number. For example I'm sitting in a restaurant right now and the number is... 62 to 72, averaging 65.

I can’t tell if it’s quieter or louder, the reason I say this is because, if you hear a gunshot on camera with the regular gunshot then with a silencer it sounds like it’s the exact same decibel but just a different sound. I think it’s because the camera can’t actually register something that’s a super high or low decibel but rather just recognizes the noise it makes, so maybe even though the propeller sounds louder on camera, it’s just a different sound that makes it seem loud but in reality is a lot lower of a decibel.

Bro that ascended to beyond