Can This BLADELESS Fan Work? | Fans showdown S5E10
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- Опубліковано 9 гру 2023
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Have you ever wondered if a fan with no blades could work. well today we look at one modeled after a natural phenomenon that performed better then I could have predicted.
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*@Major Hardware*
0:30 You could start a 2'nd series: "Fan Testing Showdown" (or a better name?).
Where people submit contraptions that can be used to test a fans different properties ;P
Would those Spirometer will the balls work? It just popped in my head while watching.
@@sebbes333I like this idea! I've posted my setup on the Fanshowdown reddit page already!
RSL sucks as a company. Sad to see you taking their money
Personally do not care about the game sponsor. (especially given it's uh... reputation...) BUT there is one thing I'll suggest for the next season and the on thing you had built for it. Which is... put sides around the flap so that when air pushes past it, air can only flow in the same direction as it went into the flap initially from, and no other direction until well after the flap as to ensure you get the most accurate of readings from the flap.
I'll post again so you can see it here. You can get a manometer that reads in millimeters of water column for 80 bucks. It's called a DWYER magnehelic. They have models that go from 0 to 6 mm of water column and another that goes from 0 to 10 mm of water column. I think it would be perfect for this show, and wouldn't cost you that much money. It would also be much more accurate than the 3D printed device you made. I think accurate static information along with the velocity tube is the ultimate test of a fan without a super expensive machine
I would choose the quieter fan.
I use that to test the velocity of my farts
He could 3d print a piezometer ring to make it more accurate.
Amazon has them as low as $45
Do you do dust collectors? Lol
Tom should build the dragon shredder, where he alternates one blade of each fan to see how it performs
i second this. tom if you are in the comments do this!
also the name sounds cool
Is it a dragon that shreds or is it shredding dragons?
@@pascalwiery7129Yes
@@pascalwiery7129It is the dragon shredding dragons
Wow, the bladeless fan didn't come last! That's pretty impressive 👏
Is came last. The FPM on the smoother are wrong
@@basquescout Yeah but not overall last as it did beat the Turbinator V3 from S05E08
@@basquescoutim jorking to u rn
It's not really bladeless, it's just a very inefficient impeller with support walls as blades.
I think it would be interesting to take some top performers and see how they perform at different duty cycles. As we know, PC fans don’t run 100% speed all the time, so maybe there are fans that maintain performance farther down into lower % speeds.
That's why I suggested to make a normalised run on 1000rpm, and one at full tilt, and decide the score as a performance to noise ratio of both runs
@@kornaros96 that's a great idea
It is nowadays compensated by PWM, but you may get some performance differential still
It could also be worth measuring the fans efficiency at each diffferent duty cycle (watts per cfm)
I think it would be interesting if he would stop using that trash motor.
Hey small mistake, At 9:19 Smoother shows 348 per minute airflow, but in the excel it is 248 which placed it at last while hurricane should have been there.
I'd love to see the Dragon Wing, Shredder, and Noctua against each other on a chart. RPM vs dBA vs FPM/CFM. Basically run them all at several RPM points and see how the performance is. Most people don't run their fans at full blast all the time and the Shredder could be optimized for a different RPM. Throw the Devil and Angel in there too. Would be illuminating.
Yeah, a 46db comparison would be cool, 🤔a colab with Gamers Nexus for this would be AWESOME!
@@shaneeslick Oooh noise normalized makes sense too! I'm just thinking a chart of at least 5 or so RPM levels would give us an idea of where each fan's sweet spot is and what the real trade offs are.
To me, quiet is always more important than looks, provided the fan performs well.
The problem is that the quieter doesn't move as much air.
The louder one is objectively better, because you can reduce the fan speed to lower the noise, and still obtain the same cooling as the quieter one.
I'm not saying this is a general rule, but this applies for the specific example we have at hand.
@@espertalhao041 and don't forget that the Noctua fan actually fits directly in the middle of those 2 fans and performs better than the Shredder while still being quieter than both the Shredder and Dragon Wing.
@@AbbyRawks Therefore my last remark, as it was just about those 2 specific fans, and nothing else.
@@AbbyRawks you cant compare the Noctua fan to FDM printed fans. Material type, thickness, mass.. it all matters. Until he gets the STL for an actual Noctua fan to print himself, the whole thing is skewed. I'd imagine we'd see significant boost in performance over a lot of these fans if they were made the same way the Noctua is.
First consideration : Performance.
Second consideration : Noise level.
NOT a consideration at all : Looks. After all, when the fan is working, you can't see the fancy details.
Negative consideration : Fancy lighted fan. NOBODY need lighted fans.
I highly prefer opaque cases.
That airflow looked shockingly good on the hurricane! Color me impressed
Indeed, that was properly impressive given it's bladeless. I'd love to see some evolution/iteration on this design concept.
@@KaineTubeit’s originally designed to be a new type of bladeless omnidirectional windmill.
@@KaineTubeIt's essentially an impeller mixed with a Tesla turbine, I think. Given that, I think that it needs more, thinner passages for air, and that the vanes must also be thinner. A Tesla turbine has an ideal spacing based on the viscosity of the fluid moving through it, and since air is an exceptionally low viscosity fluid, the spacing needs to be closer.
Also, a linear curve from end to end might lead to lower losses due to air direction change.
It would be cool to see how the fans perform, and sounds like, under reduced loads. 25%, 50% and 75%. Not just at max speed. I think some of them might surprise us.
🤔46db comprison to match the A12X25 as a colab with Gamers Nexus would be cool
Believe it or not, most fan noise comes from turbulence generated by putting things in close proximity to the blades. If you space the fan a few mm away from a case grill (even while retaining a seal between the fan and grill) it will get substantially quieter.
Now
I can't believe that one of my favourite shows is a show about fans but here i am, loving each episode
Some might say , you enjoy OnlyFans ;)
So, you're a fan of fans ? (I am)
@@thesfreader3068 im a fan of the fan of fans, csnt say that if this show syopped id care much
To answer your end of video question, I'd go for the dragon wing. Very few of my fans ever run at 100%, and my PC overall has a gentle hum at idle. More performance is paramount, and under heavy heavy load I'd likely be wearing headphones anyways.
I'm intrigued by the hurricane as an exhaust option mounted on the exterior against a wall, or behind a cabinet, maybe with a cage. The outward airflow scatters the heat in all directions instead of in a cone. It could also be used to create turbulence inside of a case to help cool vrms, ram modules, or NVME slots. if used in a pull configuration on a dual fan tower cooler with 2 additional fans out the back and top, it might actually significantly improve vrm performance.
Louder all the way. It will mostly run slow, but if it's needed, it has that extra performance.
or in a push+pull setup with conventional fans for the push
@@Glyn-Leine that's what I meant, push on front and pull on the backside
Some bumps or dimples on the interior surface of the hurricane might improve boundary layer adhesion and performance.
Yeah I agree the best use for the Hurricane would be for a Home Theatre Cabinet for component exhaust,
instead of powering the airflow at the wall like a normal fan it would disperse it into the gap.
Dragon Wing - because I want my fans to cool, not just be quiet. Quiet is a perk, but performance is key.
Thank you for showing pictures of each fan when doing sound test. I never remember fan names and dont know which fan is going on without picture
Thanks for giving the Hurricane a chance! Was a fun experiment 😊
I'm glad it did work at all, and in the first place was printable 😅
The smoke test looked surprisingly clean! And it was also quite silent, nice.
I'm curious what the community will do with that idea, I've seen many comments of how to improve it, or use it in different ways.
it's your design then?! can you explain how it works please!! Or have a recommendation on what I should read to try and understand how it works?
@@zippolag Yes it's my design. I'm watching this channel for many years, and in the smoke tests I noticed the air escaping sidewards in some designs. So I came up with this idea, not trying to avoid it, but use it in my benefit. As it's my idea, I do not know if anyone else had it as well and did some documentation on this. Reading through the comments, some people say it is similar to a Tesla Pump, others say it's like an inefficient impeller, whatever I'm happy it does move air, and does it quite silent which was the big aim.
Adding a second test to all fans would be helpful. Put all the fans on a variable controller and measure the noise from about 20in. Then lower the RPM from maximum until you hit 36 dB. Then test the airflow of each fan set to 36 dB. I personally never run fans at maximum, and I doubt most other do as well. I try to put a curve on mine to be mostly silent unless the temps go really high. Some fans I've had (like corsair, noctua, lian li, etc) were vastly different at maximum RPM for performance and noise, but the most expensive ones weren't always the best when I tried noise normalizing them. Right now I'm just running cheap TR 120 ARGB fans because they are dead silent and still keep my PC cool enough. I would love to see an extra test normalized for noise, and I don't think it would take long since you already measure noise and test airflow anyways, you just need to get a speed controller and a jig to hold the mic a set distance from the fans to keep that consistent.
Agreed - nobody runs fans at max rpm, which is why most of the "on the box" stats are moot. Cooling has improved so much that fans just don't need to run fast in most scenarios. I extensively tested a bunch of 120mm fans and found that they all perform about the same at roughly 1,000rpm, which is the speed that most people will want to run them at. Where substantial airflow and static pressure are required, you just have to forget about the noise factor.
I like how the computer in the background showed an animated fire the moment you said dragon wing.
Best thing on the internet, i love this. The hurricane is such a cool idea, loving the bladeless designs!
I saw the fireplace video going in the background, paused, and started one up on my other monitor. Now that I'm at the end of your video I could swear I'm feeling warmer on the side toward the fire. :D
Nice to see you back!
Shredder.
Thanks for the work and sharing data.
Merry Christmas
No me deja de sorprender lo apasionante que es diseñar nuevas hélices...Gran trabajo Major Hardware
It is a testament to the quality of your content that I don't click away as soon as you mention Raid
What you've created with the flappie-doodle thing is basically an old-fashioned mass airflow sensor (look one up for a 1990 Toyota Camry to take example).
What you're looking for is a manifold absolute pressure setup. Design a manually variable gate and use a manometer installed between that gate and the fan to measure pressure, and an anemometer on the other side of the gate to measure air flow.
By adjusting the gate, you can measure static pressure vs. airflow and plot them on a graph. On most well-designed fans, the relationship is not linear; there will be a point where airflow and pressure are ideal.
Plug in values for RPM and current draw, and the result is an accurate representation of the fan's overall performance.
love the series. That hurricane one can def be impoved upon, but im suprised with how well it did though. Nice to see new ideas.
ive been waiting for this
I love this channel and this show so much!
For the static pressure meter, just put the door on a spring. BMW used this design for air flow meters in all their early fuel injected cars in the 80s. The door was on a clock spring that gave it some resistance and linearized the output. Also, counterbalance the door so that the weight of the door doesn’t exert any closing force; only the spring holds the door shut. BMW did this by simply mounting the door on a vertical pivot.
It’ll also be a lot more accurate if the zero point where the door is shut isn’t at 90 degrees. A little preload, like 10 or 15 degrees also linearizes it.
Obviously this design isn’t used in cars anymore, because it’ll ultimately never be linear, but you can get it pretty good. Good enough at least.
The hurricane did a surprisingly good job for a bladeless fan! I wouldn't expect it to compete with the axial bladed fans, but for what it is, it did very well.
Would it have been possible to test it turned around (blade inside the tunnel) so that the airflow was going the same direction as the other fans? That seems necessary for a fair comparison.
For your static pressure tester, have you considered an adjustable spring? If you set a target for the airflow to open the flap, say, to 45 degrees, you could adjust the spring tension to restore the flap position to 45 degree per fan, then compare the spring tension values across fan designs. It's an approach similar to used in AFM designs in 80's automotive applications.
the best way to get good advice on the internet is to be a bit wrong. i love the fan testing box idea. keep it up!
Efficiency is the key to quiet operation.
For the most part, a 120 mm PC fan will spin at around 800-1000 RPM (or roughly 40-50% speed).
Now, it would be fun to test various designs at these speeds to see which ones are the most efficient at moving air at a low noise setting
Thought - could be a fun video idea. I really like the idea of the swinging gate device to measure static pressure. I think you could run a test to help you create a scale for it. If you were to hook up an a12x25 to it and control the voltage you run to the fan. Then, have linear increases of voltage and track the position of that gate to that. That way, you'd be able to increase the power of the fan linearly and compare it to the height of the door. Just a thought, love the channel.
the shredder goes towards an idea I had, the shovel fan that was on ages ago performed way better than it should have; I think having a very thin bottom part of the blades will be good
Maybe it’s a great idea to use a u-tube nanometer and a radiator for pressure measurement. Just place a piece of straight section in between the fan and the radiator making a pressurized chamber and connect it to the u shaped tube filled with water. It’s simple, you can measure both a positive pressure and a vacuum, it has a visual reference so it’s fun to watch and it has real life condition simulation. Anyway I’m a big time enjoyer if this channel keep it up💪
This was covered in the last video and in it's comments section. The Noctua fan used as the base for all these designs creates a static pressure of around 2mm water, with such a tiny movement how are you going to measure the differences between fans to any reasonable degree of precision?
@@ferrumignis I didn’t knew lol however if you make the tube where the pressure acts upon bigger than the tube which is moving you can amplify the output really easily
Regarding the non-linear flow gauge, you could drive a nautilus gearset so that initial movement is very slow but continued movement gets multiplied the more the flap is opened.
We all have more than an fan, so I would try both the quieter one and high performance one, together, on seperate fan curves and seperate headers.
It's what I do now with my exhaust fans. One is top exhaust, very quiet. One rear industrial exhaust, powerful but loud.
I run controlfan software which allows you to spin fans at speeds depending on the temp of a number of different components, meaning fans nowhere near the heat source, don't have to ramp up. All helps to keep it cool with a good volume balance.
really shocked by the bladeless performance. super interesting
I like low noise and would like to see the Alphacool Apex Stealth metal fan get compared to other things on the test charts
For your pressure gauge have the fan blow strait up a clear tube with small holes in the side at even intervals and a ping pong ball (or similar, slightly smaller than the tube) that will hover in the tube.
A vertical tube with holes in it spaced evenly along its length(think mythbusters when they tested the terminal velocity of a penny), put the fan at the bottom, and a plug in the tube. Whatever fan can lift the plug the highest has the greatest static pressure.
Shredder for style, dragon wing for performance, and hurricane was AWESOME.
Dragon wing every time. Performance is the measurement that matters to me.
Keep up the great vids. Stay Happy and Healthy
You could add a pocket to the door at a distance perpendicular to the door to hold water and use a burette to add water until the door just closes (with a fixed diameter bleed hole) and use the volume dispensed + calculation to give the relative figure
Dragon Wing all day, every day. My standing floor fan and my headphones/speakers put out way more noise than any case fan ever could. Give me dat sweet *performance*.
I'm curious how a normal fan would do pulling air backwards through the tunnel. Would be a good apples to apples comparison of the Hurricane to mount a bladed fan backwards.
for the static pressure device, why not a flat panel attached on 2 sides with springs inside the tunnel. then calculate the spring constant and the nm to compress the springs to determine force from fan
Easy fix for your DIY gauge:
Instead of designing it as a "swinging hinge" design it to where it has a VERY light weight spring pushing the door towards the cage, then have the door slide along a rail using frictionless bearings.
Or even do it without the spring, since that increases tension as it's compressed, and reset it manually after each fan.
I live in a tiny house and use a computer fan for exhaust. It is sealed up really well and the air flow is needed to remove moisture. However when you open the door it will start spinning the fan backwards. I think the hurricane would work great for this purpose because i think the it would allow for pressure changes without stalling the fan motor and probably be easier on the ears. Would like premission to print one out for myself.
I'm a custom loop man. I go for high static pressure to push thru the radiators and quiet because low idle noise is one of the joys a custom loop has. But a lot of that depends on the application. With just air cooling, In a giant atx-xl case noise can naturally be contained within the case sometimes so cfm is what you shoot for and worrying about noise is secondary, whereas in an sff build noise can get out of hand quickly, but you still need good airflow, and in some big cases as well noisy fans can start to sound like an airliner spooling up
Before I look at the results that smoke test looks like the best blade-less fan yet. By a ways.
Great job. 👍
I think I would rather have the Shredder. I actually prefer the look. Also I would try to throw it on one of the fans with an extra gear so if I needed to get the extra performance when I need it and the quieter performance when I don't.
Working with large hvac we use magnehelic or manometers before and after The radiator but the same can be diy'd with a water collum if designed correctly
You can still slow down the Dragon Wing to perform at about the same level as Shredder, but it still looks much better. :D Actually at some point you might do a noise normalized shootout among the best coolers.
6:40 The supports/struts/members that enjoin the concentric duct-walls will act/behave as blades. Also noticed, whether a print imperfection or intentional, the surface of the ducts had seams or raised linear surface areas perpendicular to the rotational plane; this definitely would have an influence on moving air, such as the raised areas on the control surfaces of wings, the design of air brakes, etc.
To make the measurement device valid and work here is an easy fix. Create a small weight system to the door (i.e. neodymium magnets that you can stack), find a specific value and aim to make that consistent by changing the weight, it is not too fine of a measurement, but it allows you to have a reference, by keeping the door around a similar level and then just knowing how much weight can be moved
If you go with the higher performance fan, you can run it at a lower RPM, ultimately delivering similar performance noise normalized, except with extra overhead when you're really are pushing the envelope.
The fan blows into a chamber. Coming out of the top of the chamber is a tall, clear tube with a regular pattern of holes drilled into it. A ball sits in the tube. The more static pressure the fan generates, the higher it will push the ball up the tube.
Hi Tom, great video. What do you use to make the vapor/smoke?
You could have the air pressure act on a piston to compress a spring of known spring constant, possibly through a lever to multiply force for better resolution and measure spring compression to calculate the pressure based off known piston area
You just described the basic principle of operation in the Bosch L-Jet fuel injection system's airflow sensor.
last year i send the 64B PC comresor which is made for static pressure i wonder how it would perform in this new season, also a have tip for better static pressure mesure, you could attach the fans to ballon on weight scale and how much the ballon would puffed up, the more weight would be applied to the weight scale.
For static pressure I think you will need something with a sample tube in the air stream and some liquid to lift vertically akin to a barometer.
If the quieter fan was sufficient in cooling, I would feel comfortable using 2 of them to increase airflow. That means one for intake and one for exhaust.
Also, you could 3D print an airflow adapter that fits in your current flow tube.
It would need to have a small pipe inserted into the middle with half the tip cut for a venturi effect. Then connect a hose to a carburetor airflow equalizer meter that uses a floating bead to measure vacuum pressure created in the tube.
Do what Bosch did for their fuel injection systems. Put that puppy on it's side and use a very light spring to provide the resistance. Put a MAP sensor before and after. Then you'll have volume and pressure differential.
If you do the door opposite with a small spring gravity will help you differentiate more as performance increases.
Hurricane design actually seems neat for a case fan. Something that doesn't blow directly onto components, but would still provide internal air as an intake fan.
What you need is a Mass Airflow Sensor, I think. That gated tube seems like it’s better for measuring Manifold Air Pressure.
well a gravity push measurement device (vertical) would do the static pressure part, by definition. well you have the down force (gravity weight) and piston area, and height the fan can passively push static pressure.
It wasn't that far off on performance so I would go with the quieter one. I do really like the Hurricane. I could see using that as a bottom intake fan since it would pull in fresh air and spread it across the bottom of the case helping prevent hot spots.
I basically always have headphones on while I'm at my computer, so unless a fan is loud enough to still be distractingly audible through them, I'd go for performance any day
- To measure pressure capabilities of a fan you may build a variable opening duct as a restriction and measure airflow at any step.
For example, a 50% opened grille, with another behind that can slide and cover the holes. Or a 33% with two sliding grilles, or a 25% with three, etc...
Measure both behind and in front of the fan to test any difference in a push or pull configuration
- I did not expect the hurricane to be that good!
- The Shredder may be "quiet" looking at the db level, but the noise signature is quite annoying in my opinion
For the test method for next season maybe just get a transparent tube and plug it up with a stopper that can slide along the tube like a bullet. If the testing phase sees that a fan can only push it so far you can just go by that. If the fans keep pushing it to the limit you can attach it to a scale of some sort to see how much pressure they actually put on it.
For air cooled PC's definitely the quiet one, but for radiator static pressure is going to matter more and will be louder anyways, so whatever is more powerful at that point. If you don't use headphones the loudness doesn't matter, but desktop speakers I would want highest airflow with minimal noise, and low noise being priority.
@MajorHardware It would be nice to look at ratios like CFM to input power (flow rate per unit input of power) and Noise level to input power. It would be interesting if you can somehow get a good estimate or measurement of heat removal rate from the CPU to the input power. This can certainly help with the selection of fan blade design.
Would love to see the performance of the hurricane with a volute style housing to concentrate the exit. Seems you could pipe the heat out of the system very easily that way and have a compact volute shroud around it.
personally i used to run my old system that sounded like a harrier jet preparing for vertical takeoff so i'd go for loud+performance any day. when im not gaming i can always reduce fanspeeds for sound reduction :)
Just a thought for the static pressure contraption. Perhaps if you used a light weight PLA or a pre-foamed light weight PLA and made the door be a spoon or curve that would continue being in the airflow as it rises but the fan would need to push more and more weight which would be much more linear rather than exponential. Just some thoughts
For me to choose between Shredder and Dragon Wing I'd want to see a noise normalised comparison.
I wouldn't like to run a load fan very fast but if it still outperforms the quiet one even at low speed it would get my vote. On the other hand I could run a quiet fan at %100 so it really depends on what moves more air at the volume of the Shredder at max RPM.
I agree, noise normalised would be a nice metric to see if I was after the best performance to noise ratio for a quiet system, perhaps something that can be added to the next season.
I would take the performance option and run it at a lower speed if I want less noise. But the performance headroom at the cost of some noise is helpful.
A lot of the choice depends on how you perceive the fan noise but for me who has tinnitus it doesn't really matter but I'd choose performance over noise every time.
I was hoping Tom would make an even louder piece, to spite the comment section.
the louder one for sure, as someone who built a few pc's in the early days where they scream their Fing heads off idling, 52dba is nothing, typically your game volume is much louder then that or your wearing head phones so it doesn't matter and everyone is just super pretentious about noise now days.
I have an old windows 98 for some older games and hearing that thing boot up sets the mood perfectly!
@majorhardware please get the magnehelic, I love Your passion for testing and I think using a decent instrument will make the videos perfect
Your tunnel flow meter just needs a simple manometer ported from one side and a two-way bubble level glued on top. The quietest fan that provides adequate cooling would always be my choice.
Something that could be considered for the Dragon Wing I think is adding dimples to it. I know that you did tests forever ago on dimples vs no dimples but with updated testing methodology, he might be able to keep the sound levels lower without sacrificing as much performance compared to the "stock" Dragon Wing. Hell, on a fan that was performing as well as it was there might even be a slight performance difference between the 2 in favor of the dimples since the fan blades won't be flat.
The hurricane might be alright for strictly exhaust🤔
It doesn't have anywhere near a tight enough cone to blow air at or over parts that need cooling.
Hi, I have a suggestion about the visuals. May be think about using a polarizing filter on your camera to reduse the amoun of reflections on the acrylic sheet, so we could better see what's going on behind it
I'd love to see the top 20 fans put through a complete fan-review process, like having someone with a complete lab (eg GN) take these and get all the metrics.
The robot told me Farahdin got me rolling man.
I feel like adopting a piston style static pressure rig would be better.
Take a long spring of known force, make a vented piston as the face of it, and place it inside a tube that fits the fan.
You could use either a load cell, hall effect sensors and magnets, or a couple external indicators to measure how much the spring compresses to determine how much pressure the fans generate.
Adding a worm screw in the back would let you adjust tension minutely, and swapping springs would let you adapt for more granular measurements on fans that are very close in flow/pressure.
I'll go Dragon Wing for performance, I use headphones a lot anyways, so I won't even notice
For the questions of shredder vs dragon, i would put the drahon in my case, better cooling and rad fans. I can tolerate a bit of extra noise from my battle station
When a fan is on, what it looks like doesn't matter so much.
The Hurricane could have applications where you do want to draw air through a space but don't necessarily want positive pressure or don't want the exhaust going in one direction, I suppose.
A 4.5dB difference in sound level is quite significant. Considering every 10dB is 10x louder, that difference in volume is not worth the comparatively insignificant nearly 10% difference in airflow. I would absolutely go with the Shredder over the Dragon Wing.
I think the static pressure tester is a good machine to use but perhaps make the entire door entry conseiles so no air can escape near the end. Allowing for a true result. The bleed off from the opening can cause a mis reading but if it's a tunnel through and through similar to a throttle body on a car then it should be fine.
The sound of the Hurricane was surprisingly pleasant. And it still moved as much air as some lower grade bladed versions.
And arguably the bigger the hurricanes outer diameter the better its airspeed would be.
So do we dare? Experiment to see how big theh need to get to become unwieldy? To check where from category 1-6 the upper limits of the design could be?
My headphone isolation is good enough that i wont mind a jet engine as long as my components are cooled properly.
The deciding factor for me on fan (noise versus performance) has always been based on the case itself. In small cases where space is at a premium, giving up on noise for performance because you have less fan options available to you is the correct choice. However, since I do love me some big spacious cases where I can have any combination of fans front, back, top and bottom, and still have plenty of room left over for shenanigans, the obvious choice is to give up performance for less noise and run fans slower. It's a big case, you can always add more fans if you aren't getting good thermal exchange.
In a small case, you have less air mass to move and you can channel it easier. Even a crappy fan usually generates enough flow to get the volume turned over pretty quickly.
The trouble with small cases is pathing air to the GPU. Overcome that (I've used cardboard to mock up plenums that I 3D print after) and you're usually golden.
If i had to choose between the dragon and shredder fans, it would probably depend on the calculated heat displacement difference, like for instance, if it was only 2°c different, then i would choose the quieter one, but if it was 10°f difference (on average) then yes, i probably would choose the louder one... although, i wonder if a fan could possibly be made out of multiple materials, to try and change the air/noise frequency, without changing the efficiency...
If it was going in some cupboard somewhere, I'd be prioritising airflow, pressure, basically wouldn't care how loud it is.
Given I'm not, I've already prioritised low noise above all else with the Noctua P-14s redux that I have more than a dozen of. 1200rpm of super low noise gentle breeze through massive radiators, with an essentially silent pump, and a large case. You could probably put a sleeping baby atop this thing while it's running benchmarks, and the only thing that'll likely happen is it'll be extra cosy from the rising warm air.