Full Feature Video: ua-cam.com/video/C10XgojHu44/v-deo.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 🔴 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.
@@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!
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.
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.
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.
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.
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
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
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.
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,
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.
@@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
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.
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
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.
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
@@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.
@@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.
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.
@@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
@@TGiFoosday You can get a good result with acetone for that. There's also a process using acetone vapor for smoothing that delivers wonderfully smooth surfaces and strong adhesion. Unfortunately the acetone process works only on ABS, not PLA. There aren't many solvents that even touch PLA, and all of them are either toxic or carcinogenic.
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.
Even if you really care about true volume of sound these aren't perfect so they aren't even but forgetting that the new design sounds a lot deeper and less annoying. Id honestly still prefer there sound over classic design even if they were louder
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.
@@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
Exactly. Because if he designed his own regular props too people would see that he isn’t even aware of the airfoil shape in regular props. His design is just a flat surface so obviously it’s not going to be as quiet or efficient as an air foil.
@@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
To reduce noise you need to make the length of the propeller in 2 - 3 times more and increase the number of blades + increase the width of the blade depth, then they will rotate slower but pump a larger volume of air, it will affect the speed but noise will reduce by many times
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 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.
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....😅
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.
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.
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.
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 👌
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!!!
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.
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
@@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.
Granted I just realized this is only a short and there's a full length video.. I hope in the full length, as well as wish it would've been included in this short if so, simply adding a device to measure the dBs next to the drone would give a much better understanding and convey the difference in terms of sound than merely attempting to capture it via a phone camera presumably, or even if it were a DSLR, then uploaded to UA-cam for viewers to attempt to discern what all differences there are. It's kind of like doing a performance test without any kind of measurement system in place. Sure, if it's superior enough, you could tell just by viewing it that one is better than the other, but by HOW MUCH it is, and raw numbers and data, at least in my opinion, the most interesting and enjoyable part.
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 ...
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.
@@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.
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
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.
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.
One of the overall funniest set of comments to a video I've ever read. With some good technical advice as well, such as compare a 3D printed version of a regular prop to the one you made.
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...
@@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.
@@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.
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.
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).
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.
😂😂 serious question: we’re you able to lock the mic gain on the camera? An SPL meter app would highlight a relative difference at full throttle. Subjectively similar levels on camera, possibly slightly less high frequencies off the torroidial? High frequencies fall off quickest with distance so that isn’t a significant win over an absolute decrease in level 🤷♂️
Your new ones are 2 main mounts like a regular 2 blades spinner but there are two areas of lift to EACH blade... Therefore 1 blade has 2 lift surfaces There are 2 blade routes, but 2 blades per mount. Therefore These blue ones are equally a 4 bladed prop. & The high end has been removed from the frequency.... Cool.
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.
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
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 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.
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.
They're louder (likely because the 3D printer isn't capable of printing them to the specs necessary to eliminate noise), but I love the louder sound so much more lmfao
"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.*
So.. you get 2 toys at home, a 3d printer and a drone and then you start to test and avaliate what people at MIT study for years.... youtube bring us big heros sometimes
Its amazing what you can do when unencumbered by engineering, aerodynamics or proper understanding of airfoils. :^) ... Not that bad for a first kick at the cat though.
the premise is that the Hz frequency at top speed is more dull less spike so it dont hurt your ears.. they would prolly be better if you sand smooth and even all edges and sides no chips flaks grooves or lines then polish coat and try to keep that smooth and dont let is wall up in the twist
Full Feature Video: ua-cam.com/video/C10XgojHu44/v-deo.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.
Very interesting!!! Thanks for the videos!!
@@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.
@@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!
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.
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*
Lmao lmao lmao
More like a swarm of bees.
Lower frequency tho
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.
@@iCantEvenButtonsGaming did you really just say "perfected propellers" 😭😭
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.
In other words they need to be molded not printed
100%
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
It was mostly notable at higher frequencies as well.
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
Proof that design spec doesn't matter if your manufacturing process can't deliver the required precision.
Are you saying my man's 3D printer ain't up to snuff?!
Yeah the real ones are trash too, they just muted the sound in the video for their demonstration unlike his
@@ITX-EcoClass yes
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.
@@jamiepierson7772 you would know
“It’s supposed to be quieter than traditional propellers”
Cue category 5 hurricane
they are made for boat impellers LOL inboard jet motors
they are meant to put out 2x the pwer with 1.3x the sound this guy is an idiot
@@cantan111 They're literally intended for use in drones to make drone based applications easier to be accepted in residential areas.
Anakin - ~~~ "I think it's working!!" ~~~
@@lunchbox1553tbf there are people who indeed made quieter drones with these fancy props. People just want to be funny hence the comments.
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
Residents of Kyiv can hear drones louder.
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,
WAIT YOU YOU ARE A MOD FOR JAKERTOWN
😂😂😂😂
i live on kyiv and that made me wheeze@@АлександрСемёнов-ч9ч
Its not quieter, but if you’re trying to scare someone away and they happen to fear bees…
🤣🤣🤣🤣🤣🤣🤣
3d prints are not aerodynamic. This test is completely bogus and pointless
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.
Well, how do we know that? We need a comparison video
Beads?
The design isn't the flaw here. It's the materials and manufacturing.
The design really looks like an improvement overall
Thinking exactly the same
@@oslier3633 are you trolling? or… just not very smart?
@@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
@@jameshenderson4094 MIT used 3d printers.
Also, precision just improves efficiency by a few percentages. This thing just sounds louder.
normal propeller: small handheld drill noises
toroidal propeller: plays Flight of the Bumblebee
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.
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
ABS and acetone smoothing might work well.
@@conorstewart2214 Exactly what I suggested on another of these videos.
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.
Automatic audio compression is one hell of a thing. You never know if what you heard was how loud it really was.
Instead of sounding like a drone, it now sounds like a bunch of *_angry bees_*
Sounds like hornet chase. 🤣🤣🤣
This joke reminds me of that one trajedy... whats it called? Norm Macdonald?
Its actually suppose to sound like a military helicopter
Have it drop black/yellow marbles.
exactly my thought...a lot less top end frequencies though,
mids n lows...
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
He wanted to compare right? So no these arent quieter
@@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.
He also failed to mention they made many different variations and are still testing it.
@@Deathblow85He wanted to directly compare the designs as the only variable. He couldn't, so the results don't matter
@@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.
"These are supposed to be quieter"
Drone: *sounds like a swarm of Bees*
Ah yes the final nail polish coating. The ultimate finish
Ikr, why not just clear coat it? Like from an airbrush or simply an aerosol can.
@@JPtheGamer650I'm guessing the nail polish lays down thicker to fill in the layer lines. Smooth finish.
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.
@@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
@@TGiFoosday You can get a good result with acetone for that. There's also a process using acetone vapor for smoothing that delivers wonderfully smooth surfaces and strong adhesion. Unfortunately the acetone process works only on ABS, not PLA. There aren't many solvents that even touch PLA, and all of them are either toxic or carcinogenic.
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.
I was not expecting to BURST OUT laughing
Glad to see someone bringing more attention to these!
bro got trolled into putting a loudener onto his drone
edit: no edit
loudest drone in the ends
😂
Loudener 🤣
"Loudener" genius 😆😆😆😆
“Erharera to test it out”😂😂
That sounds about 8,000 times louder
maybe because it was built with the wrong materials and techniques?
Its not really louder. It's just a deeper tone vs a higher pitch. Would work better with diff materials and bigger, thinner loops
Who cares?🤓
@@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?
@@EthanJahnz i dont👍
Even if you really care about true volume of sound these aren't perfect so they aren't even but forgetting that the new design sounds a lot deeper and less annoying. Id honestly still prefer there sound over classic design even if they were louder
"Loud" propellers: *slight whistle*
"Quiet" propellers: have you ever heard of the word hurricane?
@danny supersell have you heard of the triforce?
Have you heard about our lord and savior postal dude?
Have you heard of the high elves?
Oh what am i saying, of course you haven't.
"Loud" propellers: Now we FLY!
"Quiet" Propellers: WE WILL BATHE IN THE BLOOD OF OUR ENEMIES!!!!
Have you heard the tale of Dath Plagueis the Wise?
that might be the most fearful sound u hear in the future
Unless your aiming is on point 😁
Hahaha
yeah mit is trying to help kill a lot of people.
@@hellcrow539 aim wont matter if theres a swarm of them 🫡
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.
Or print the toroidal props out of ABS and acetone smooth them to get a very similar finish to the stock injection molded props.
@Conor Stewart isn't that what he did? The nail polish remover is acetone.
@@maksrambe3812 he didn't say he removed the nail polish
this^. a control would make this test way more useful
@@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
"supposed to be quieter"
*SOUNDS LIKE A HURRICANE OF BEES*
I think MIT is trolling us
Would be interesting to see a comparison against 3D printed regular props
Exactly. Because if he designed his own regular props too people would see that he isn’t even aware of the airfoil shape in regular props.
His design is just a flat surface so obviously it’s not going to be as quiet or efficient as an air foil.
Given the ridges on the props they're substantially louder. Smoother and more balanced blades will yield better results and quieter performance
Makes it sound like a giant, angry bee. 😂
3d print yourself a pop filter for that mic man holy shit
💀
Lmao true 😂
MIKE- 3d print a giant rose stem and lower yourself onto it, friend.
AYO 😭
🤣🤣🤣🤣
Well, I don't know about it being quieter. But I do think it sounds a little less annoying, a little more muffled, less of the higher frequencies.
Sounds just as loud
They sound frequency is lower so its quiter from the distance
@@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
it sounds cooler tho
if not louder~
@@thelespauldude3283 isnt it supposed to be the opposite?
To reduce noise you need to make the length of the propeller in 2 - 3 times more and increase the number of blades + increase the width of the blade depth, then they will rotate slower but pump a larger volume of air, it will affect the speed but noise will reduce by many times
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.
Honestly it’s not hard at all to replicate something on a 3D printer
Not that impressive, especially when he did it so crudely, which made the props even louder
@@Jordan-rb28 you must be a lot of fun to the parties you're not invited to...
@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.
@@kuzadupa185 thank you! IOW, anyone can be a critic…..
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....😅
Looks like you got a little more than you bargained for 😂
@@Oatskii Isn't that how it usually happens?
Carry a racquet…
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.
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.
Sound like a fly near my ear
Which is impressive since he built an inferior version lol
Now imagine what it'd sound like if it was made properly?
Low frequency sounds travel further than high frequency sounds...actually.
@@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.
NGL, I fricking love the sound those blades made.
This should be titled, "professionally manufactured propellers vs whatever I made."
🤣🤣
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.
That was surprisingly interesting considering the topic, Cheers
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 👌
It’s crazy stuff. Spilled some at a Boy Scout camp once and paint thinner was not cutting it.
your props : VRAaaaaaaaaaaaaaaaa
turboflex prop : AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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!!!
Honestly, the difference I can hear is that the new blades sound like a swarm of bees is coming for you.
Swarm of bees are much quieter after they sting you to death
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.
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
@@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.
3dB increase is double the perceived sound
Welcome back to the UK, we missed you ! ❤
"Let me show you how I made them: first they didnt exist, then they did. Now lets try them out"
I’d love to see this tested again after printing the props from an SLA/DLS (resin) printer like a Form2 or Form3
James Dyson: **laughs in 120,000 RPM**
😭😭😭😭😭😂
🙄
Granted I just realized this is only a short and there's a full length video.. I hope in the full length, as well as wish it would've been included in this short if so, simply adding a device to measure the dBs next to the drone would give a much better understanding and convey the difference in terms of sound than merely attempting to capture it via a phone camera presumably, or even if it were a DSLR, then uploaded to UA-cam for viewers to attempt to discern what all differences there are.
It's kind of like doing a performance test without any kind of measurement system in place. Sure, if it's superior enough, you could tell just by viewing it that one is better than the other, but by HOW MUCH it is, and raw numbers and data, at least in my opinion, the most interesting and enjoyable part.
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 ...
On the upside, an Angry Bee sound maker sounds like a Lawn prop
That was significantly louder.
Sounds like a swarm of bees.
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.
the real propellors were literally 3d printed too
@@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.
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
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.
get this man a pop filter
😂😂 yooo I’m weak
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.
One of the overall funniest set of comments to a video I've ever read. With some good technical advice as well, such as compare a 3D printed version of a regular prop to the one you made.
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...
or simply set it to hover & time how long it takes to fall out of the sky.
Sounded allot louder than the original blades
That’s what I thought, but it could have been just sound compressed differently. He should measure it properly.
The problem is that it's a rough, 3D printed propeller vs a smooth, manufactured propeller. It's not a fair comparison at all.
were you testing their propellor? or the one you designed to look similar in fusion?
Do you ask purposefully pedantic and rhetorical questions? 🤔
He showed himself 3D printing it ya goob lol 😄🤦🏻♂️
@@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.
@@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.
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.
The outer geometry looks waaay off...
that toroidal propeller sounds louder than the regular ones if you ask me
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).
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.
Do you have two print heads on the same printer to print duplicates? That's awesome!
😂😂 serious question: we’re you able to lock the mic gain on the camera? An SPL meter app would highlight a relative difference at full throttle. Subjectively similar levels on camera, possibly slightly less high frequencies off the torroidial? High frequencies fall off quickest with distance so that isn’t a significant win over an absolute decrease in level 🤷♂️
Your new ones are 2 main mounts like a regular 2 blades spinner
but there are two areas of lift to EACH blade...
Therefore 1 blade has 2 lift surfaces
There are 2 blade routes, but 2 blades per mount.
Therefore
These blue ones are equally a 4 bladed prop.
& The high end has been removed from the frequency....
Cool.
I'll never understand how these obviously very smart people who design and print this stuff can't watch their plosives when recording a voiceover.
There's no way that's quieter than regular blades .
I recommend trying blades with waves across them like whale fins. That should be dramatically quieter
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.
Just because you heard MIT doesn't mean there are no time-wasters over there.
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
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.
You want goosebumps just think of all the children a silent drone could bomb.
@@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.
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.
@@conorstewart2214 yeah but traditional drone bombings don't capture that delicious close up of the terror on their faces the second before the blast.
Sounds pretty powerful, I’ve gotta say! I’m curious to see where this technology could go!
MIT students: “We failed”
from what i understand, it’s not quieter, it just produces lower toned sounds so it’s less annoying
might actually be louder, but lower in the high-end, which equals slightly easier on the ears.
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.
For this type of thing it is better to use a resin printer, it leaves the surfaces very smooth
It removes the high pitch frequency that can literally bust your eardrums.
Sounds the same lower pitch.....
they're quieter from further away, they produce less high frequency soundwaves from the normal ones
Gotta use the wishbone props that zipline made
Nail polish doesn't always dry with the smoothest surface. Spray'em with poly or something for quieter operation
They're louder (likely because the 3D printer isn't capable of printing them to the specs necessary to eliminate noise), but I love the louder sound so much more lmfao
Someone was smoking dead bugs. Those are 2 to 3 times as loud.
Well of course they are Albert Einstein, they were 3d printed lol.
My dude looking like Goose from Top Gun.
Also, they sound horrible, louder even. Maybe if they were properly molded plastic that would help?
That’s what I say in my video
Went from angry mosquitoes to angry hornets! 🤣
This is a perfect example of how one can be both bright and dim at the same time 😆
You
"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.*
So.. you get 2 toys at home, a 3d printer and a drone and then you start to test and avaliate what people at MIT study for years.... youtube bring us big heros sometimes
The fuck are you complaining about? Do you produce better content? Is it cheaper than free? OK then.
The only thing this video was missing was a Kip "dang it!" at the end. 😂
Its amazing what you can do when unencumbered by engineering, aerodynamics or proper understanding of airfoils. :^) ... Not that bad for a first kick at the cat though.
please don't kick cats
That MIT degree was far ahead
the premise is that the Hz frequency at top speed is more dull less spike so it dont hurt your ears.. they would prolly be better if you sand smooth and even all edges and sides no chips flaks grooves or lines then polish coat and try to keep that smooth and dont let is wall up in the twist
Wasnt expecting that nail polish part tho😂
Sounds like an apocalyptic amount of bees buzzing O.o
It sounds like a swarm of electronic bees are coming to kill me.
“They are supposed to make them more quieter”
Drone afterburners kick on
sounds like a damn hive of bees coming for me.
Sounds louder than original lol
Bro is testing the sound... Show us how well it flies!
You didn't make it quieter, you made it angrier
Sounds like a “slightly” less angry swam of bees. 😂
i thought drone was attacked by bees and a hornet chase is loading ......