the scramblejet looks like a compressor intake on a turbine... maybe it's worth testing a mirrored version? wouldn't be the first design on the show that's been modeled backwards.
It has some things in common with a design I submitted. I had an intake cone but it only covers the inner half of the fan while the outer half of the fan was exposed to nearby air. It would be nice to see if that works.
Cool. Though in nature the golden ratio is both a natural shape and one that could be said to create as little a disturbance as possible so as a cooling fan I see few chances of it being applied outside of themed stuff.
Seems more like that fan design just requires higher RPM then what the A12 can do. I wonder how much of a increase in DB you'd get if you spinned it faster to match a stock fan in cooling performance. If it's still significantly quieter it would be a good design for a higher RPM fan design perhaps. He might have to get a little creative if he wants to test that fan design at higher RPMs. I think it would make for an interesting video at least if he did it. :)
Pulling air though a funnel or any passage with reducing area will expand it, aka reduce its pressure, not increase it, if the flow is subsonic. This is true of liquids too. Velocity increases, pressure decreases. Compressors in jet engines compress the air via the work the blades do on the fluid. The decreasing passage area is a consequence of the increased pressure (and thus density) of the fluid, and the goal of maintaining flow velocity (higher density means you need less area for a given velocity).
Love the Fan Showdown as always. One data point that might be interesting to add is how many grams of filament you used to print each fan. I think it would make comparison between some of the fun, jokier giant fans to the more normal ones easier. Also might get people thinking of how to design the most efficient fan from a materials POV. just a thought, keep up the great work!
I wonder if it would be possible to tweak the blades on that golden ratio fan to be a tad steeper. And how much it would affect performance? I know it wouldn't get to top five or anything, but I think it wouldn't be that much louder and thus could be a good choice in some cases.
@@Kualinar I think we mean the same thing here, I just thought it the opposite way (steep/shallow against what). Might also be because English isn't my native language.
Love the show as always, I really thought the scramble jet would have done better. The torpedo surprised me but it makes a lot of sense, fluid and aero dynamics are very similar. I think the clipped ends didn't really hurt the fan, I think if it was made smaller to make the tips fit inside the frame would actually be worse. I would say you want the surface area more then the tips.
fluids actually include gasses. there is a way to math things out while scaling things so that you are simulating water with air or vice versa, so I wonder if that would make it easier to make fans, considering that boat/torpedo propellers are already well engineered to move stuff...
The Scramblejet may not be the quietest of these four but it's got the best sound I've heard in the entire series thus far, including all the previous seasons.
So the torpedo impeller is necessarily designed to move through a much more viscous liquid than the normal cpu fan. This probably hints to something that major PC builders have been thinking is going on, you can have as beefy a fan as you want but at some point in time the rad is going to choke the air flow. This would mean that static pressure is much more important than unloaded air and fan speed, this would also state the obvious in that the flow rate is more important than the flow speed, I think the relevant unit of measurement would be cubic inches per second/minute. It would be very interesting if you could retroactively start testing for mass airflow rates.
I would guess you actually improved the fan by clipping the ends as by doing that you created a better barrier against the outer casing hence improving the static pressure generated by the fan, of cause if you clipped the ends very close to the casing otherwise you'd have done the straight opposite
iirc in a duct the aspect ratio of the blade is effectively infinite, which massively increases the efficiency (like the long wings on a glider). On the torpedo itself the blade is rounded because this helps increase efficiency in a similar way (think of the elliptical wings on ww2 fighters)
@@jamiemerritt3533 there is also an aspect to the curve of the blades in terms for centrifugal effect. if you look at the fan of a high bypass jet engine they have a very slight forward curvature to try and hold on to air being pressed outward from the center. it's not as needed on such an engine due to forward momentum which helps to push escaping air back into the fan.
@@TommyApel yeah there's loads more influencing the shape of a torpedo prop, like minimising cavitation for example, I just thought comparing elliptical wings and high ar wings was a nice way of thinking about it
Honestly if he made an onlyfans and just showed clips of different fans moving fog he could make a bunch of money off of the sheer novelty. People WILL throw money at stupid jokes.
the torpedo probably worked better with the trimmed end as there is a more complete movement of air next to the frame. and the turbine thing needs inverting as it was running backwards when compared to its design
I'd like to see the scramble jet with the opposite chirality, so you could have it pushing air rather than mounting it backwards and trying to suck it in.
You fell into the fan show down I agree but its all because you are always trying new stuff that other tubers are not doing. Keep up the great content man, I'm happy I found your channel!
The closer the fan to the housing the less pressure spill-over past the tip, ie, end-plates on racing car wings and new passenger airplane wings. Can you put the rpm in the final temp graphic so we can see if the blades are better or it's just a higher rpm.
I don’t know how you did it, but you have become a comfort thing. So anytime I feel unbearably sad I watch you fan videos, if I have free time, that is.
Generally Test Set Orange AKA International Orange (the official color) is usually for Test&Evaluation within the RDT&E divisions of their respective branches. Yellow Banding is HE (High Explosive) and a lighter blue is inert which is usually used for training… though sometimes can have elements that still have danger associated like spotting charges on MK76 training rounds. So you can actually have either blue or yellow with orange included if and when testing…. And if the item has testing components onboard. The orange isn’t limited to just ordnance but also A/C and vehicles… but naturally not limited to those specifically. This is coming from someone that actually tests. Great vid man! Love the content!
considering that the torpedo's propeller is designed to reduce vibrations in the water, I think the torpedo fan would most likely be a big quieter if the tips were not clipped
I thought the scramblejet was wrong during the smoke test, then I rewinded a bit and saw the noise test was looking the other way. How much different could be the data of noise looking in the right direction? perhaps nothing, but just curious great show btw never miss it 👍
So in my recent venture into researching fan design for the sake of this series, I would say clipping the edges of the fan did slightly increase the performance. To begin with, propeller style fans are designed to maximize their output without the benefit of a cylinder around the blades. They do this by tapering the edges to reduce drag and rotational inertia and stuff. Inside of a cylinder, the blades can be maximized to the depth of the hub across the length to the edge to fully take advantage of being inside a cylinder. Something about not having to lose static pressure or something, idk. So by clipping the edges off, you increased the area of the fan taking advantage of the inside of the cylinder. Likely misused technical jargon aside, I'm hoping to make a fan someday but I'm not good enough with any 3D modelling software yet to make something I'd be pleased with. Maybe someday soon.
That clip on the torpedo fan is probably what caused so much noise, kinda like the difference between curve edge and strait edge propeller on old school air craft
I believe that the clipped fan actually helped it increase the efficiency If the fan was scaled down it would have more space and less air to move. This is only my uneducated hypothesis Great episode
I believe that by clipping the edges of the torpedo, you made it work better because you increased the service area of the blade were as if it were to have been designed smaller it would had a smaller surface area pushing less air.
I don’t know if the torpedo fan would be better or worse! On the one hand, if it weren’t clipped it would maybe have pushed more air but could also run at a lower rpm meaning it would push less air, but on the other hand having clipped propellers would result in possibly less air being pushed but could also would result in higher rpms. Maybe it would just cancel out because both cases result in more air getting pushed? It’s probably a negligible difference though.
After 3 seasons the Noctua (OEM) is still the fan to beat. The 'Cheater' delta is an anomoly, plus the +7dB in noise is not what anyone is looking for in a fan. Love the concepts of them all. People are very creative.
Also, I think you should find or build the most basic small-ish shaped PC case with slots for a minimum of 2 fans for incoming and exhaust air and print out two of each fan and pair them up in different configurations and then do the fog test. Just dangle the fog wand in front of the basic cases front area and see if the fans still suck in any air. Make sure one side of the case is clear so we can see if the smoke inside just kinda spins around and lingers, or if the second fan/exhaust fan actually pushes the smoke out, and if it does it with any reasonable force. And then, here's the best part, you can MIX AND MATCH other fans together and see if there's a combination of fans that work better as a pair than any two fans of the same design.
you can see that the smoke goes at a really steep angle on the golden ratio fan (45°? ) , that shows that there is a clear problem with the inclination and profile of the blades, that could explain why it spins fast but makes no noise : the blades aren't getting enough air to push. I would really like to see an improved version of that fan to come back in the show.
The Torpedo fan imparts a lot of swirl to the airflow - you can see it spinning as it exits the fan. Now, if we look at the actual torpedo propellors, you will note that there are in fact 2 propellors, one clockwise, the other anti-clockwise. This means the spin cancels out, making the (water) flow tighter and so more efficient at propulsion. Or, in this case, it would be a faster air flow in a smaller cross-sectional area.
About the Torpedo... Well, we Vietnamese are simple, funny and curious. People even gather closely to watch sappers defuse decades-old bombs, some sawed bombs themselves for scraps. So just some "random harmless Chinese things" don't scare no one. At least sometime "natural selection" does its job and you don't need coffins...
2:35 I dont even care if it performs bad it just looks cool... also photography! college teacher was great at drilling stuff into my head about that, golden ratios, fibonacci sequence, etc etc etc
The flats on each blade of the Torpedo should reduce the tip vortex, making it quieter and more efficient. The U.S. Mk 48 torpedo uses a shroud over their screws for this purpose.
the torpedo fan was very interesting to watch, you could see it kept most of the air in a cylindrical shape behind it. I suppose it was designed to move water in a stealthy manner... could that be what's crucial to making air fans less noisy too? :O
I saw that, you could see like, the vortexes/spiral in the air it was shooting out the back? usually it looks like a giant amorphous cloud but for the torpedo it looked like it had actual shape: ua-cam.com/video/5_SlRQsRaM0/v-deo.html if anyone wants to go back and look
if you adjust the angle of attack on the GR fan fins, It might work a lot better. You can see that most of the pushing is occurring around the axis, whereas it's practically parallel in the outer third of the blades. I bet it will get a lot louder, as well, though.
I don't have the technical chops, but I think Golden Ratio has a good chance with some slight modifications. Try giving the blade *angle* the Golden Ratio as well. I think the blades as is were just a slightly rotated trajectory. (Ie. take top layer, drop an inch, rotate 5 degrees, done. being how it was created.)
5:05 The Thermalright TY-147A (140mm fan with 120mm mounting points) has this special design wich you can also see at submarines. This fan is really silent. 5:21 This will absolutely affect the performance especially the noise ratio. Also the surface is way to much rippeled. This, i think, affects many of the designs we've seen here (i know it's not easy to get a better surface by 3d printing).
The golden spiral one seems to have cut down a lot of the material at the tips, where the fan is traveling the fastest. Also, unlike a lot of designs, the angle of attack moves from shallow at the center to heavy at the end, kind of the opposite of normal, right? These factors probably didn’t help the design out.
There have been a few fans on this show that were set up to flow backwards. I would really like to see you test those again, but mirrored this time so they work like the standard. I think for one it would give them a chance in case the reversed angle was an accident, but it would also be an interesting study in how flow direction affects cooling ability. To that end you might also bring in one or two of your favorite standard fans and flip them so they flow backwards. The factory a12x25 would be a good choice for that, to act as a control.
I feel like the Golden Ratio might perform better if the blade angle swapped the leading edge and trailing edge then mirrored the print. My reasoning here is it looks like it's actually fighting the centrifugal force of the air it's moving, because it looks like, if the nosecone is pointing the direction it's pulling from, the blade are sweeping the air inward toward the center. I'd be interested in seeing how it'd fare in my suggested configuration.
Ok, the Golden triangle fan is super quiet, i love that. . Please please increase the speed of it until its it as noisy as the other fans and see how well it cools. I bet it will work fairly well.
I wondering how much of that is to do with the completely flat leading edge... I would kinda like to see the same golden ratio design but with a steeper angle on the blades
Like the torpedo in the picture and lots of other propelled vehicles using blades, you should just try to use 2 fans stacked that are counter-spinning to see how much performance is gained.
What would be really cool, if someday we could have a collab between you and the Slowmo Guys. With maybe the best performing and some ridiculous fans, so that we can see the smoke getting chopped by the blades in super slow motion!
I would be curious to see how these different fan designs would perform in the 3d printing world for cooling parts. Bridging distance for example? Might be a huge fan shroud though unless could design for the smaller fans
"Now if this fan, you know, hurt your brain a little bit too much, the next fan, it required a little bit less math..." The first one didn’t hut my brain. This one does.
I would like to see a sealed container or a container with a set orifice and then measure the static vacuum. If you have low flow but high vacuum you can compensate with a higher density cooling fin heat sink. Also if your space is limited then heat sink fin density is the only thing you may be able to change in your cooling solution.
I think that a different blade angle on the golden ratio can make a big difference
So angled at the golden ratio as well?
@@SHv2 gotta be
The angle of attack is too low, yeah. It could work really well if it was tweaked.
It still have really long blade, it's probably spinning the aire more than it pushes it.
Wonder how that would affect its noise level
the scramblejet looks like a compressor intake on a turbine... maybe it's worth testing a mirrored version? wouldn't be the first design on the show that's been modeled backwards.
thats exactly what i thought, just mirror it and print again. it probably has decent static pressure
Yeah, immediately after seeing it in smoketest I assumed it's backwards
It has some things in common with a design I submitted. I had an intake cone but it only covers the inner half of the fan while the outer half of the fan was exposed to nearby air. It would be nice to see if that works.
I had the same thought. Can anyone remember if the results were different the last time he mirrored one? My memory is terrible.
Came on to say the same thing. Love to see it mirrored.
The Golden Ratio fan looked like it was onto something if all you needed was a quiet fan . I think a blade angle tweak might just make it a winner.
Just look at the first golden ratio fan. Original was 61.9 at same dB
Cool. Though in nature the golden ratio is both a natural shape and one that could be said to create as little a disturbance as possible so as a cooling fan I see few chances of it being applied outside of themed stuff.
Seems more like that fan design just requires higher RPM then what the A12 can do. I wonder how much of a increase in DB you'd get if you spinned it faster to match a stock fan in cooling performance. If it's still significantly quieter it would be a good design for a higher RPM fan design perhaps. He might have to get a little creative if he wants to test that fan design at higher RPMs. I think it would make for an interesting video at least if he did it. :)
I think the scramble jet was running backwards, I think it is supposed to pull air in that funnel and compress it like a jet does.
So it needs a flip and repeat?
I think the phi would do a lot better if it were significantly taller
@@carpediemarts705 mirrored not just flipped
Pulling air though a funnel or any passage with reducing area will expand it, aka reduce its pressure, not increase it, if the flow is subsonic. This is true of liquids too. Velocity increases, pressure decreases.
Compressors in jet engines compress the air via the work the blades do on the fluid. The decreasing passage area is a consequence of the increased pressure (and thus density) of the fluid, and the goal of maintaining flow velocity (higher density means you need less area for a given velocity).
I also think the golden ratio was running backwards
@@runed0s86 Nope. It has a counterclockwise blade pitch, just like the others.
the among us to Torpedo transition was unexpected
So smooth!
and much appreciated!
Unexpected but so well done
The whole time I was like "Where is he going with this?!?"
I’m a big fan
Damm thats deep
Underrated comment
What's your cfm?
*ny
I have a couple big fans.
I would like to see the reversed version of the scramble-jet!
Yes, please mirror it.
You could tell that the torpedo inspired fan was doing well due to the vortexes it produced as the air was leaving the props.
Love the Fan Showdown as always. One data point that might be interesting to add is how many grams of filament you used to print each fan. I think it would make comparison between some of the fun, jokier giant fans to the more normal ones easier. Also might get people thinking of how to design the most efficient fan from a materials POV. just a thought, keep up the great work!
I would like to see that, and how long it took to print.
I wonder if it would be possible to tweak the blades on that golden ratio fan to be a tad steeper. And how much it would affect performance? I know it wouldn't get to top five or anything, but I think it wouldn't be that much louder and thus could be a good choice in some cases.
The blades are to steep. They need to be shallower, by about half, at least on the leading edge.
Yes and also that part should follow the golden angle.
@@Kualinar I think we mean the same thing here, I just thought it the opposite way (steep/shallow against what). Might also be because English isn't my native language.
Love the show as always, I really thought the scramble jet would have done better. The torpedo surprised me but it makes a lot of sense, fluid and aero dynamics are very similar. I think the clipped ends didn't really hurt the fan, I think if it was made smaller to make the tips fit inside the frame would actually be worse. I would say you want the surface area more then the tips.
fluids actually include gasses. there is a way to math things out while scaling things so that you are simulating water with air or vice versa, so I wonder if that would make it easier to make fans, considering that boat/torpedo propellers are already well engineered to move stuff...
Scramble jet needed to be mirrored. It's supposed to pull from the top. That would make a significant difference.
2:43 that guy on the monitor kinda mirrored your hand movement
What a fucking catch XD How the hell did you even notice that lol
@@Goodgu3963 vision 100
The Scramblejet may not be the quietest of these four but it's got the best sound I've heard in the entire series thus far, including all the previous seasons.
So the torpedo impeller is necessarily designed to move through a much more viscous liquid than the normal cpu fan. This probably hints to something that major PC builders have been thinking is going on, you can have as beefy a fan as you want but at some point in time the rad is going to choke the air flow. This would mean that static pressure is much more important than unloaded air and fan speed, this would also state the obvious in that the flow rate is more important than the flow speed, I think the relevant unit of measurement would be cubic inches per second/minute. It would be very interesting if you could retroactively start testing for mass airflow rates.
Add time-lapses of the fans printing dude. Love the show!
Yeah that would be neat to watch them rise up as he talks about them
that! is a great suggestion! up! up!
James' heart says it all Mārtiņš , we gained ourselves some extra fine content soon.
Honestly it would be a cool thing to add as a transition, or to give more time to talk about the fan
@@industrialvectors no, not really. Thanks for the respect though.
I would guess you actually improved the fan by clipping the ends as by doing that you created a better barrier against the outer casing hence improving the static pressure generated by the fan, of cause if you clipped the ends very close to the casing otherwise you'd have done the straight opposite
My thoughts exactly
iirc in a duct the aspect ratio of the blade is effectively infinite, which massively increases the efficiency (like the long wings on a glider). On the torpedo itself the blade is rounded because this helps increase efficiency in a similar way (think of the elliptical wings on ww2 fighters)
@@jamiemerritt3533 there is also an aspect to the curve of the blades in terms for centrifugal effect. if you look at the fan of a high bypass jet engine they have a very slight forward curvature to try and hold on to air being pressed outward from the center. it's not as needed on such an engine due to forward momentum which helps to push escaping air back into the fan.
It should be noted that by changing the dimensions to fit inside the casing effectively decreases blade surface area.
@@TommyApel yeah there's loads more influencing the shape of a torpedo prop, like minimising cavitation for example, I just thought comparing elliptical wings and high ar wings was a nice way of thinking about it
You should start an onlyfans. Major hardware is the perfect name for it.
Been subscribed since you watercooled that tower cooler. Just ribbing you.
and it would be only fans.
@@Typhyr just imagine all the clickbaited people checking out the actual most apropos channel on that site.
Honestly if he made an onlyfans and just showed clips of different fans moving fog he could make a bunch of money off of the sheer novelty. People WILL throw money at stupid jokes.
This would be incredible, and literally all the pictures are just fans and their results from the showdown.
I'd sub.
Nice one!
the torpedo probably worked better with the trimmed end as there is a more complete movement of air next to the frame. and the turbine thing needs inverting as it was running backwards when compared to its design
I'd like to see the scramble jet with the opposite chirality, so you could have it pushing air rather than mounting it backwards and trying to suck it in.
You fell into the fan show down I agree but its all because you are always trying new stuff that other tubers are not doing. Keep up the great content man, I'm happy I found your channel!
The closer the fan to the housing the less pressure spill-over past the tip, ie, end-plates on racing car wings and new passenger airplane wings.
Can you put the rpm in the final temp graphic so we can see if the blades are better or it's just a higher rpm.
I'd like to know how the scramble jet would perform if you mirrored the print so it pulled air in the opposite direction
2:43, I like how James and Reinhardt (the game character in the background screen) make a hand gesture at nearly the same time.
Reprint the sub propeller at the right dimensions and try that again, probably going to improve the performance a little bit!
I don’t know how you did it, but you have become a comfort thing.
So anytime I feel unbearably sad I watch you fan videos, if I have free time, that is.
You should do a mirrored version of the scramblejet, I suspect it would work *far* better that way.
I think the scramble jet may be mirrored, I'd like to see it printed so it spins the other way around! Wonder how much air it would move...
Thank you for another amazing episode of my favourite YT show. Love it!
Generally Test Set Orange AKA International Orange (the official color) is usually for Test&Evaluation within the RDT&E divisions of their respective branches.
Yellow Banding is HE (High Explosive) and a lighter blue is inert which is usually used for training… though sometimes can have elements that still have danger associated like spotting charges on MK76 training rounds.
So you can actually have either blue or yellow with orange included if and when testing…. And if the item has testing components onboard. The orange isn’t limited to just ordnance but also A/C and vehicles… but naturally not limited to those specifically.
This is coming from someone that actually tests.
Great vid man! Love the content!
Anyone else notice how perfect the lighting is? Almost looks like a green screen if you think about it
Can’t believe how entertaining your channel is considering how simple and innocuous your subject seems.
considering that the torpedo's propeller is designed to reduce vibrations in the water, I think the torpedo fan would most likely be a big quieter if the tips were not clipped
Scramble-jet is very cool. Though I don't think it was intended to go backwards or if they made a mistake with the blade direction? 🤔
I thought the scramblejet was wrong during the smoke test, then I rewinded a bit and saw the noise test was looking the other way. How much different could be the data of noise looking in the right direction? perhaps nothing, but just curious great show btw never miss it 👍
Goddangit this show deserve more views.. A meme, a math, and a story..
So many creative people out there. It's super nice that we still get new and interesting designs.
I love this show
What’s with BANNA in the long number that goes across the bottom of the screen?
I haven't really laughed at a video in awhile, but your clip from the office was perfect 👌🤣
I think the Scramble jet should be flipped, the design should clearly pull air in from teh side walls and works totally different in this config
Production quality in these videos keeps getting better. Well done!
So in my recent venture into researching fan design for the sake of this series, I would say clipping the edges of the fan did slightly increase the performance. To begin with, propeller style fans are designed to maximize their output without the benefit of a cylinder around the blades. They do this by tapering the edges to reduce drag and rotational inertia and stuff. Inside of a cylinder, the blades can be maximized to the depth of the hub across the length to the edge to fully take advantage of being inside a cylinder. Something about not having to lose static pressure or something, idk. So by clipping the edges off, you increased the area of the fan taking advantage of the inside of the cylinder. Likely misused technical jargon aside, I'm hoping to make a fan someday but I'm not good enough with any 3D modelling software yet to make something I'd be pleased with. Maybe someday soon.
Can you print that scrambled jet mirrored so it spins the normal way? I feel it would preform much bettet
I like this little stories about every fan. Keep it please!
That clip on the torpedo fan is probably what caused so much noise, kinda like the difference between curve edge and strait edge propeller on old school air craft
.... hold up... the letters "BANNA" is in phi? (@01:56)?... is there something I don't understand about numbers or is that a joke?
That 2018 story was very MrBallen. We need more of these tangents!!
WOW. The Smoke test! Love it, liked the video immediately.
Video quality is just getting better, loving it!
I believe that the clipped fan actually helped it increase the efficiency
If the fan was scaled down it would have more space and less air to move.
This is only my uneducated hypothesis
Great episode
The modification was definitely an improvement! I bet the fan wouldn't even turn without clipping the blades.
The U.S. Navy's training torpedos also use an orange warhead section. But they had flotation devices and were (almost) always recovered.
First time watcher and enjoyed the little humor and the "fan" showdown.
Great way to keep the work day going, love the fan videos and builds
This guy is basically mainstreaming the science and future development of case fans. Also fan blades in general.
I believe that by clipping the edges of the torpedo, you made it work better because you increased the service area of the blade were as if it were to have been designed smaller it would had a smaller surface area pushing less air.
That smoke test music track grows on me more every time I hear it
I don’t know if the torpedo fan would be better or worse! On the one hand, if it weren’t clipped it would maybe have pushed more air but could also run at a lower rpm meaning it would push less air, but on the other hand having clipped propellers would result in possibly less air being pushed but could also would result in higher rpms. Maybe it would just cancel out because both cases result in more air getting pushed? It’s probably a negligible difference though.
After 3 seasons the Noctua (OEM) is still the fan to beat. The 'Cheater' delta is an anomoly, plus the +7dB in noise is not what anyone is looking for in a fan. Love the concepts of them all. People are very creative.
Also, I think you should find or build the most basic small-ish shaped PC case with slots for a minimum of 2 fans for incoming and exhaust air and print out two of each fan and pair them up in different configurations and then do the fog test. Just dangle the fog wand in front of the basic cases front area and see if the fans still suck in any air. Make sure one side of the case is clear so we can see if the smoke inside just kinda spins around and lingers, or if the second fan/exhaust fan actually pushes the smoke out, and if it does it with any reasonable force.
And then, here's the best part, you can MIX AND MATCH other fans together and see if there's a combination of fans that work better as a pair than any two fans of the same design.
long time lurker here, just had to make this comment: wow. what a giant, yet brilliant segway into the torpedo fan. props to you for that one
you can see that the smoke goes at a really steep angle on the golden ratio fan (45°? ) , that shows that there is a clear problem with the inclination and profile of the blades, that could explain why it spins fast but makes no noise : the blades aren't getting enough air to push. I would really like to see an improved version of that fan to come back in the show.
The Torpedo fan imparts a lot of swirl to the airflow - you can see it spinning as it exits the fan. Now, if we look at the actual torpedo propellors, you will note that there are in fact 2 propellors, one clockwise, the other anti-clockwise. This means the spin cancels out, making the (water) flow tighter and so more efficient at propulsion. Or, in this case, it would be a faster air flow in a smaller cross-sectional area.
Man! I really feel bad for the Scramble Jet. Would love to see another test with a mirrored version. Love these vids! Keep it up!
That segue was god tier. Linus Tech Tips must worship at your feet of deep cutting segues
never would've thought this showdown keeps being this interesting, nice work!
The scramblejet has a lot of potential. It needs to be balanced. I'd reprint and re-test.
Fan showdown makes me unreasonably happy. Thanks!
About the Torpedo...
Well, we Vietnamese are simple, funny and curious. People even gather closely to watch sappers defuse decades-old bombs, some sawed bombs themselves for scraps. So just some "random harmless Chinese things" don't scare no one.
At least sometime "natural selection" does its job and you don't need coffins...
2:35 I dont even care if it performs bad it just looks cool... also photography! college teacher was great at drilling stuff into my head about that, golden ratios, fibonacci sequence, etc etc etc
Those transitions between fan stories are smooth
lol the tf2 noises and all the memes are great as always
The flats on each blade of the Torpedo should reduce the tip vortex, making it quieter and more efficient. The U.S. Mk 48 torpedo uses a shroud over their screws for this purpose.
the torpedo fan was very interesting to watch, you could see it kept most of the air in a cylindrical shape behind it. I suppose it was designed to move water in a stealthy manner... could that be what's crucial to making air fans less noisy too? :O
I saw that, you could see like, the vortexes/spiral in the air it was shooting out the back? usually it looks like a giant amorphous cloud but for the torpedo it looked like it had actual shape: ua-cam.com/video/5_SlRQsRaM0/v-deo.html if anyone wants to go back and look
I think the clipped end would lose some performance if the air doesnt break off smoothly, but if you sized it down to fit, it may reduce surface area.
if you adjust the angle of attack on the GR fan fins, It might work a lot better. You can see that most of the pushing is occurring around the axis, whereas it's practically parallel in the outer third of the blades.
I bet it will get a lot louder, as well, though.
ill say it again. I REALLY appreciate the image (video?) of the fan in the corner during the smoke test
Somebody else noticed the "BANNA" in the golden ratio? 👀
i think that you should print a mirror of fans that are "backwards" just in case the person messed up and missed it ( unless specified )
I don't have the technical chops, but I think Golden Ratio has a good chance with some slight modifications.
Try giving the blade *angle* the Golden Ratio as well. I think the blades as is were just a slightly rotated trajectory. (Ie. take top layer, drop an inch, rotate 5 degrees, done. being how it was created.)
5:05 The Thermalright TY-147A (140mm fan with 120mm mounting points) has this special design wich you can also see at submarines. This fan is really silent. 5:21 This will absolutely affect the performance especially the noise ratio. Also the surface is way to much rippeled. This, i think, affects many of the designs we've seen here (i know it's not easy to get a better surface by 3d printing).
wow I thought you just started rambling about the torpedo, but then you hauled it inn with the next fan and it was amazing
I feel robbed. I sent in a golden ratio fan that was a 3 blade fan back in like, season 1 or 2 and it was never selected
The golden spiral one seems to have cut down a lot of the material at the tips, where the fan is traveling the fastest. Also, unlike a lot of designs, the angle of attack moves from shallow at the center to heavy at the end, kind of the opposite of normal, right? These factors probably didn’t help the design out.
Just look at the first golden ratio fan he did. Original was 61.9 at same dB
There have been a few fans on this show that were set up to flow backwards. I would really like to see you test those again, but mirrored this time so they work like the standard. I think for one it would give them a chance in case the reversed angle was an accident, but it would also be an interesting study in how flow direction affects cooling ability. To that end you might also bring in one or two of your favorite standard fans and flip them so they flow backwards. The factory a12x25 would be a good choice for that, to act as a control.
I feel like the Golden Ratio might perform better if the blade angle swapped the leading edge and trailing edge then mirrored the print. My reasoning here is it looks like it's actually fighting the centrifugal force of the air it's moving, because it looks like, if the nosecone is pointing the direction it's pulling from, the blade are sweeping the air inward toward the center. I'd be interested in seeing how it'd fare in my suggested configuration.
Ok, the Golden triangle fan is super quiet, i love that. . Please please increase the speed of it until its it as noisy as the other fans and see how well it cools. I bet it will work fairly well.
Can we just appreciate how quiet the golden ratio fan is?
I wondering how much of that is to do with the completely flat leading edge...
I would kinda like to see the same golden ratio design but with a steeper angle on the blades
@@mrrooter601 yeah, I was thinking that too, maybe wider blades too, increase surface area.
Like the torpedo in the picture and lots of other propelled vehicles using blades, you should just try to use 2 fans stacked that are counter-spinning to see how much performance is gained.
I approve of the Wera toolset.
"Four new contenders for the oddest..." "Four new contenders for the most 'outside the box' design..." "Four new contenders to... contend!"
9:30 What is this "light" button I should be clicking?
always look forward to TFS! im really saddened that the Golden Ratio didnt do better... it just looks so perfect...
Honestly I don't get the look good thing, I mean its not ugly but its not exactly beautiful or anything.
It's certainly a winner in the noise department. Perhaps some adjustments could get it closer to the top.
What would be really cool, if someday we could have a collab between you and the Slowmo Guys.
With maybe the best performing and some ridiculous fans, so that we can see the smoke getting chopped by the blades in super slow motion!
I would be curious to see how these different fan designs would perform in the 3d printing world for cooling parts. Bridging distance for example? Might be a huge fan shroud though unless could design for the smaller fans
I think this warrants a short.
Is the torpedo fan better as is?
Or will resizing the blades to fit make it better?
"Now if this fan, you know, hurt your brain a little bit too much, the next fan, it required a little bit less math..."
The first one didn’t hut my brain. This one does.
I would like to see a sealed container or a container with a set orifice and then measure the static vacuum. If you have low flow but high vacuum you can compensate with a higher density cooling fin heat sink. Also if your space is limited then heat sink fin density is the only thing you may be able to change in your cooling solution.
I love the show. Keep up the good work.
"Can you even imagine puling in your line and seeing and seeing a 22 foot long torpedo?"
But for the fisher it was at least 27 feet long. =)
"it's always fan" would be a perfect ending to this video!