Who WINS the SILENT Propeller WAR?

[@larrys.feraca306]

I'm naming it the "wishbone" propeller. You heard it here first.

[@thebeyondofficial]

😂

[@maestromaestria7564]

That actually suits It so well

[@zavatone]

The pulling forces on the rotating mass for that will put lots of stress on the motor bearings, shaft and additional rotating items unless a counterweight is added.

[@TheT0mmen]

​@@zavatoneyeah, that's a part of the design lol

[@DaveSmith-cp5kj]

Noise reduction is important for military/police applications but for commercial drones I think the biggest issue is not noise but security which no one seems to be bothering to address. Especially if you are delivering expensive items.

[@whale-psychiatrist]

Cameras?

[@SagesFury]

Noise is very important for civilian applications too....

[@Timedelayedfuse]

​@@whale-psychiatristdisguises.

[@j2782]

Just encrypt your transmit and receive signals. If you can load an encryption key into your transmitter you should be fine.

[@derp195]

Nobody is talking about it because encryption is easy, and the weakest point in security is the fact that *packages are left unattended on your porch.*

[@christianmoreno7390]

Hello. Are there any 3d print files for this zipline propeller design??

[@airdroperua]

yes, we have

[@christianmoreno7390]

@@airdroperua how can I get access?

[@totally_lost1602]

Actually this prop has the center of thrust WAY offset from the motor shaft, and will chew up motor bearing rather quickly. What makes it quieter is simply changing the single frequency of a propeller with identically spaced blades, into two very different frequencies ... one significantly higher and likely outside hearing range, and the other significantly lower and better attenuated by the environment. The enclosure also allows for sound management much better than free air props. I wish anyone the best that tries to run a delivery business with these props, as the motor failures will be horribly expensive, and leave drones and/or product littered across the service area.

[@marks3072]

Excellent info, thank you. Do you know of any props that reduce noise considerably, without trashing the drone mechanics, for the DJI Air 3S? Thanks again.

[@you.got.gapped.racing44]

In order to make the propellers silent, you must reduce the wake or turbulence caused by the propellers, a standard blade’s endtips produce a lot of wake, a toroidal propeller eliminates the need for an end tip, meaning that the wake is basically removed, but as we see in the new era of formula one cars, the rear wing appears to have no end plates, which reduces wake, and also reduce downforce efficiency, to the contrary, the 2017-2021 formula one cares had more boxy and turbulence causing rear wings, they were consistently more efficient and made the cars quicker, similarly, having an endplate on the end tip of a propeller is enough to not only reduce the wake but also give the propellers more lift, which yes still makes them more noisy, but making smooth ridges that go parallel with the airflow on the wing is enough to clean up the airflow enough to give a balance between having optimal efficiency and not being a noisy inconvenience, and some noise is generally good, because this is enough to alert us with them.

[@capbarker]

There was once a time when passing commercial planes would be deafening to anyone on the ground. Nowadays, while planes are far from silent, you can easily continue a conversation (even where i live next to an airport) I'm looking forward to seeing how these delivery drones progress. Will they have to have traffic-type systems once there are hundreds in the same airspace? Will illicit goods become more easily delivered by blending in? What unforeseen problems will we find?

[@vincentditizio8790]

Nice, but my main concern is when they'll be available fpr the drones I fly. Dji mini series, neo, etc. People are unnecessarily crazy about drones, thinking they are being spied on. Not being noticed is important to me.

[@patrickschlauch6638]

You forgot to mention the most important advantage of the asymmetrical design of the Zipline propellers, which is the reduced drag when not in use while the drone is moving fast in forward direction with the rear propeller and wings only.

[@physicsinphysis]

Почему Вы не можете использовать пропеллеры с подвижной осью, чтобы использовать его как несущий пропеллер на малой скорости и как тяговый пропеллер на высокой скорости?

[@patrickschlauch6638]

@physicsinphysis Sorry, can you write in English? Translator doesn't work

[@physicsinphysis]

@@patrickschlauch6638 , no problem, i can use translator. "Why can't you use propellers with a angled or even movable axle to use it as a carrier propeller at low speed and as a traction propeller at high speed? I'm sorry, I'm not an airplane designer, just curious."

[@patrickschlauch6638]

@@physicsinphysis Thanks, now I can understand your question. There are two different type of propellers for both lateral and vertical trust on this drone. The zipline propellers are used to lift the drone up an fly vertically and horizontaly at low speed, for higher speed they stop moving and reduce drag due to their aerodynamic shape, for higher speeds the uplift is generated by little wings and the rear propeller only.

[@physicsinphysis]

@patrickschlauch6638 , thank you for lesson! I understand you!

[@Larsbor]

If these soundproporties can be carried over to big industrial windmills …. they might be less opposed in their environment, and help electrify and make clean energy in the future.

[@TK8866275]

I wonder if it's possible to improve unequal zipline propeller by connecting the propeller tips like in toroidal design. If ring shape of toroidal design eliminates turbulance caused by air flowing over the tip like in traditional propeller it might do the same also in zipline.

[@stug77]

JUST..... just make the rotor larger. This will reduce the frequency of the noise and thus make it quieter to humans.

[@jimmyzeng998]

can you like at least cite your sources, like I know one of them is action lab but can you cite all of them?

[@RynaxAlien]

Which is most power efficient at lift? Cycloidal are too expensive?

[@MgNoobie]

Yeah the impact is during war the quieter the deadlier

[@Flesh_Wizard]

The war impact will be the grenade delivered to the enemy

[@simonci5177]

Why this blades are not in all drones now. Like in DJI or on the planes? Of for DIY drone builders

[@Ryurex]

new technology and probably they patented the blades so they'd require a license to sell, use and distribute them commercially

[@Ryurex]

for DIY drone builders there's already people reverse engineering blades them on youtube but it's a lot of trial and error, if not printed precisely as intended it will blow itself up.

[@therealdohos2607]

its sad that we had to wait til they figure a way to silence drones to get aerial pizza deliveries.

[@izjusme9504]

Why does the zipline drone have five propellers? Doesn't that provide a torque bias?

[@RaghunathTambde]

It is a safety provision, if one propeller stops working the fifth propeller acts as a substitute, but if all are working fine it works as a speed booster pushing the back air

[@blakes8901]

assuming enough thrust headroom, any torque imbalance can be compensated for using software, with potentially a small loss in overall ability and performance depending on the situation

[@animehair05silently88]

the fifth propeller seems to be for forward propulsion in either a fixed wing mode or a hybrid fixed wing/quadcopter mode, at least in part

[@m14srv]

Right so the next upgrade should be attaching the 2 blades into a single toroidal shape and maybe extend the head of the counter weight to be wider

[@MykeHawke-r9r]

The Gluhareff backpack copter had a counterweight like that too, I'm not sure that was a sound reduction in that application, as The rotor was spun by a blade-tip mounted "Gluhareff Pressure Jet". This jet engine uses a combination of peculiar behaviors of: Super-heated/super high-pressure propane released just over the intake horn by a jet nozzle at super sonic velocity, air entrailment/induction, acoustic resonance tuning/resonance compression, The Little known property of superheated propane to be very attracted to metal surfaces like steel or aluminum when they are glowing red hot. Why the design probably didn't help? 😢The engine is on the outmost tip of the rotating rotor - so your ears don't have to worry about those pesky prop-tip vortices on this bad boy when the concept of a tip - jet mounted engine inevitably results in the engine noise projected 360° around blurringly fast for all to enjoy!!! And not just the consistent rpm whine of a jet or growl of an internal combustion engine ... No, that is not enough. Nay, I tell you - why bother with exhaust tones of predictability or consistency, or even the annoying screech of the pulse jet - you shall receive the glory of the rip in time and auditory space that is formed when a small cross-section of trans Sonic superheated and badly combusted exhaust enters ambient atmosphere with no exhaust shaping or nozzle. "The Rotisserie of Auditory Assault" AKA "The Decibel Dagger" I saw one at a Miramar Air show many many moons ago. The experimental helicopter section, one that had become affectionately been dubbed "Darwin Alley" by anyone who would see the kind of things people were trying to sling themselves and air with... That motor was the not the LOUDEST thing I have ever been exposed to. THAT thing produced arguably the LOUDEST engine or contraption per ounce I have ever heard, including ordinance. With a warbling inconsistent screach that Will flame out for a microsecond and then of course do a rich burn detonation when all the fresh charge reaches the chamber igniter spark - hell hath no fury like nature taking back a vacuum... But don't worry, even when the exhaust isn't pointed at you for the 280° or so, with the added value the intake nozzle sonic boom per ounce I have ever heard in my entire life

[@jeffcauhape6880]

This is brilliant

[@whysoloco]

Someone has to make it 3d printable for DJI mini Drones

[@videorowtv5198]

How about just using ducts to eliminate the tip vortexes?

[@willyd1711]

Interesting to consider other uses for quiet propellers. Like paramotors! @TuckerGott

[@dennylukman1801]

Wait until that prop design gone mainstream. Imagine ww2 bomb dropping on you without the tell-tale wind whistle from the bomb.

[@MrNeilandio]

How about an unequal toroidal propeller? Would that work?

[@JaydenLawson]

Mark Rober lied - that drone is NOT quiet

[@RedPixel2023]

Im naming it the Whisperblades. Sush!

[@kaf2303]

Cool

[@spencera3075]

Um… When it comes to police and life flights, noise takes a back seat to performance. Now commercial uses I could see this becoming required.

[@adriancarstens]

Hjuss this guy can talk

[@KidCe.]

toriodial propeller on racing drones? nah man, not a single fpv racing drone uses these

[@inventor121]

I'm more worried about children and animals woth those propellers. They have a higher hearing range than adults do and quite frankly I fond constantly barking dogs and screaming kids far more annoying that drone buzzing.

[@beginnereasy]

Use a centralized intake and pneumatics to spin the propellers... not four unique motors 😂

[@cheesedude1733]

never really compared noise from all three directly, no numbers, no sites noted, no mention of cycloidal propellers. Weak sauce. Very weak sauce.

[@did3d523]

bidon

[@chopstix4883]

Like

[@almor2445]

Why arent these in Ukraine?!

[@charlies1112]

Why tf would you want to use these for war

[@almor2445]

@@charlies1112 because there are people fighting off an invader 10x more powerful who previously genocided them. They could really use some advantage in defending themselves.

[@СергейПипенко-д7ь]

​@@almor2445 genocide? Have you any proof about that? What you know about Donbass region?

[@Wonders_of_Reality]

​@@СергейПипенко-д7ь Reminder: everything started in 2014. Russia annexed Crimea by organising rigged elections controlled by their military. At the same time, Russian bandits and some collaborationists instigated by the former FSB agent and terrorist Strelkov took over Lugansk and Donetsk regions. In the process, they tortured and murdered everyone who opposed them. At that time, the infamous Russian phrase отправить на подвал (send to a basement) was born. Needless to say, the “elections” organised there can’t be called fair and democratic in any way. I recommend reading some articles from “Guardian” if you want to know more. Long story short: It’s all Russia’s fault. Back to the topic: such drones could indeed be helpful for a more stealthier approach. At least some experimentation is worth trying. Maybe it turns out right now that speed is more important than stealth. Who knows.

[@unoriginalname4321]

@@СергейПипенко-д7ь russia slaughtered civilians in Bucha and Irpin during their attempt to take Kyiv in Feb 2022

[@Ruhgtfo]

5:30 what happened to that?

[@migueljgonzalez]

Looks like the bus got hit by a comically sized bowling ball. Rolling from the other side of the bus