World’s Most Complex PC Cooling Fan | Fan Showdown S4 Special
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- Опубліковано 1 жов 2024
- It’s only been one episode of season 4 of the fan showdown but this fan deserved a video all its own. Just when I think we have reached the pinnacle of what can be done with a 3D printer and PC cooling fans you prove me wrong. Today we look at the handy work of Selby, Selby decided that 1 120mm fan isn’t enough and wanted the power of two fans on the frame of one. Selby set out to design a contra rotating 120mm fan assembly that wasn’t just for looks. This thing is a masterpiece of FDM printing and design, not to mention its about as cool as a PC fan can be.
OH and you asked for the T33 MK3 in the cheater frame so we are also going to do that.
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FINALLY! it took me as long as the subreddit has existed but I finally got a contra fan to make it! and it actually works... good times. Going to be honest, even though I know contra rotation has its advantages I'm genuinely surprised the second fan actually managed to increase performance and seeing it do so is a very good feeling.
For anyone wondering about planetary and bevel gears sets the issues really comes down to how the gears are braced inside the fan. In the case of planetary all the designs I tried just added to much friction (causing both to be slow and much louder) all while not running at a 1:1 fan speed ratio which I wanted to reduce the chance of one fan throttling the other, this is also why the fans have the same blade count even though that probably increased noise a fair bit. As for bevel gears well i just couldn't manage to print 3D them and still function at such small scale and as such cant really as much about how well they work.
Well done! Awesome design.
It really is an awesome feat. Congratulations!
u r a legend, Sir.
Very cool design. You should be proud.
awesome fan and design. Now I want to see your Contra fan with a shroud as large as the cheaters to see if it gets even better?
The T33 alone, beat the single fan version of the contra. Would changing one of the fans (or both) on the contra to be shaped more like the T33 be even better? And what about adding the cheater housing to that?
The cheater housing might have to change a little to accommodate the second fan, so I think these two fan makers need to collab so we can see.
@@tvrkm6897 oh man, I hope they do.
contra t33 cheater...........
@@tvrkm6897 Ya, no doubt. I bet every piece would probably need some tweaking to make them all work together. But it's an interesting idea and I have my fingers crossed someone attempts it (I'm just a spectator here)
@@ghomerhust my man planning to blast the atmosphere away
The thing with counter rotating fans is that the second fan needs to have more pitch than the first one to speed up the air flow going through it. If both fans have the same pitch it can stall out the second fan and create turbulent air flow.
You can reduce turbulent air flow a bit by simply adjusting the speed of the fans but you're right, there needs to be higher pitch on the second fan blades.
It would also make more sense to power the outer fan rather than the inner fan since you really should be increasing the gear ratio from the outer to the inner. If the inside fan is doing all the work then the outside fan is really just an extra set of blades pushing the air with increased surface area. The goal is to get the inner fan to work for the outer fan and pull the air away from it, reducing the contact time with turbulent air coming off the blades and simultaneously (Most importantly) creating a low-pressure area between the two fans.
I was wondering if the second fan the air passes through would be better having a more aggressive curve if the air is already moving passed it, it would have less resistance, wouldn't it?
You can possibly see this at 9:12 in the smoke test. The smoke goes into the front, then instead of immediately flying out the back, there's a slight pause before it starts getting pulled out by the second fan.
Came here to say this!
I wonder if the blade surface volume was also impeding the performance of the twin blade design?
This turned into a crowdsourced run for the best possible itteration of current applied PC cooling. Good stuff.
I wouldn't be surprised if a company contacted the designers for the righs to use it (of course buying the design) or something
@@redmist4963 I would be very surprised. It is much better to design your own. And the big companies certainly have both the knowledge, tools, and funds to do so.
@@redmist4963 one already has. the accelleron or something i think it was called.
That technology first came from Military Aircraft engines from WW2 and such, soooo....
Yeah, you had engines that are used in Aircrafts and Tanks btw.
We NEED to see the Contra with dual T33 MARK 3s and the Cheater frame!
This. This right here.
Well why not put two fan housings back to back, so the rear one is counter rotating, put t33's (one mirrored and front back flipped) in and use the funnel of the cheater (the back housing is just a flow straightener you don't need with the counter rotation of the second fan).
1st. More power due to twice the engine
2nd. No gear noise / mechanical losses
3rd. No alinement issues so no rubbing
And I know its not a fair competition but there are push pull configs for big aircoolers to test against.
next season? *wink *wink
The god fan
And get some metal gears and bearings to lower the friction/noise 👍
@@arnejungclaus7957 Well he needs to test the contra with the shroud it had without the other blade on it to be sure otherwise its not really a comparison of the single fan vs contra rotating. So while that's a good idea but in this case actually 1+1 doesnt necessarily =2 . If you are using the exact same fans that is its only going to increase the static pressure that the fans can create and you wont get more than 10-20% more flow than what the fan is rated for initially. The second fan in the rear needs to be a higher rpm to make it have much of a difference. With the second motor counter rotating it may come out a head but i still think they will be remarkably close and it will still make a funky noise its kind of inherent with the counter rotating props if close by, Regardless tho a single fan with a counter rotating setup will be more efficient than stacking the 2 and offer more performance over a wider range of conditions and higher static pressure . you can really see it in the smoke test on how uniform of the outflow that it puts out because it is cancelling any of the lateral motion imparted by the blades .
I was thinking about designing and submitting something like this all the way back in S1 or S2, it’s awesome to see someone actually do this
ok, Dapz
This community driven content is so spectacular! I can’t help but smile as I’m watching. Love the show.
Right! It's one big group effort. You can see the innovation grow by the minute. Amazing!
AGREE... The iterative updates that we see are truly amazing. It's like Russia vs American space technology... America does millions of SIMS, where Russia builds and fixes. Toyota does the same which is why their vehicles are so damn good. Plus the amount of people pulling in new perspectives means that the rate of change is massive. In 18 months a bunch of nutters on the internet have made fans that can outperform Noctua, a very wealthy company with 25+ years of experience.
AMAZING!!!!
The gear driven stuff is cool too 🙃
Saying it again: love this show! For the content: I think the next logical step is to contraspin two T33 MK3.
and then stick that in the cheater!
@@N0RD0M on top of another cheater... and if possible a contra-cheater XD
I'd like to see comparisons with some form of air restrictions, I.e. a radiator as the double fan should have a lot more static pressure then just a single fan.
Give this man some thumbs up! In the end it should be about cooling capability not creating the best windtunnel!
@@kooskroos aircooled vs watercooled.
@@toolbaggers A water radiator is still air cooling in this context and you want air speed through the fins in either case, but if you don't have enough pressure then it will be turbulent and inefficient when interacting with the fins. Water radiators need more pressure simply because the fins are more densely packed but both will need pressure.
This is so awesome! The higher performance of two fans had me thinking for a few minutes, and I think it's because the counter-motion of the fans cancels out the angular momentum of the air. You can see this in the smoke test - the air comes out almost strait instead of in a vortex. So less energy is lost to sideways motion (which would increase friction in the tunnel, I suppose) and more energy is transfered to linear motion. In addition the air already has a certain linear speed component from the first fan, so the second can also speed it up more.
...
Well that's my speculation at least. It is really cool to see those effects overcome the negative impact of the friction between the gears, etc.
The secondary fan needs to have a higher pitch blade to take advantage of the air velocity at its intake. All compound setups need to be progressive.
Would also love to see a static pressure comparison, which is an area where the counter-rotating system should have an advantage.
THIS. You need a secondary fan which is able to handle the huge amount of incoming air pushed from the first. Meaning the fan blades on the 2 fan needs to be more open and not so angled
And the rpm can be increase as well, the reason why they invented the counter rotating blades was to stop the compression after the single blade running at high speeds so with a better manufacturing and balance, probably would be in first place.
I thought the 2nd fan needed higher pitch, not the first. Look at all turbines, and even single fan blades, the pitch is less where the air comes in and more at the exit. Where I am I wrong?
@@Joshua-uq9zw I agree with your first statement, but not the second one. (AKA, it needs more pitch on the second one)
great project 👏😎
I think the #1 thing to do to improve this design is to ditch the 3d printed gears for some off-the-shelf ones. Sloppy gear accuracy is no doubt the biggest contributior to the unacceptable noise level.
Still very impressive design-wise.
Plus those plastic gears are going to wear rather quickly and just make the slop worse. Some simple brass gears would do wonders, I mean we've been using them in watches for a couple hundred years now and they do their job for a long time.
@@SilvaDreams I beg to differ, with the right lubricant you can get a long lifetime from 3D printed gears. Replaced one (PLA) in a mixer and it still goes strong after more than a year of regular use.
@@SilvaDreams PLA isn't too bad for wear, it self-polishes, so it will get a bit more slop, but once the surfaces are smooth they are really quite durable to constant load. Just don't stop the fan with an object while spinning, bad things will happen.
Yea itd be better off with getting the shafts more rigidly emplaced and aligned and the gears maybe smoothed a bit or just made sure of their uniformity and it should improve it pretty decently, i mean if you wanted to go all out then you could go with like some metal gears with ruby bearings with either helical cut gears and some thrust bearing or herring bone gears to keep it aligned and to counter act and pull from the front blade.
@@SilvaDreams Sure, brass gears won't wear but the fans are still plastic. You could get some decent life out of plastic on plastic gears but metal on plastic would probably self-destruct.
could you do a tst with this on a radiator or cooler?
I imagine the effect of counter rotating fan on static pressure might be much greater than on cfm alone
The biggest benefit of contrarotating fans is efficiency and torque cancellation.
I am impressed with what you have created with the Fan Showdown. I remember coming to your channel when you first decided to watercool the air cooler. Impressive to see. Hopefully one day you can work with GN and get the top fans on their testing rig to get some legally defensible data to back up the fan designs.
Agreed!
You need to get some PTFE spray dry release. It's great for lubricating plastic parts without imparting any drag.
Oh, I forgot to add the model I've used for years is Camie A1000. It's the most consistent spray and fast drying solvent. It dries so fast it does not have time to affect any plastic.
Man, long ago I began watching this series to distract myself and now I'm even learning. That was great!
The journey you have taken us on, thus far, is amazing. Congrats to you, and all the fans.
This is a design used in some server fans, such as the San ace 40 or the Delta GFC1212DW, but those use 2 motors.
it's probably better to run with 2 motors. I think gears would require too much maintainance unless you use more expensive materials
Man i love thick fans
@@_ExTitus yeah was thinking the same. Basically take 2 fans and sandwich together kinda design more or less. Each with own motor and wire to connect to the motherboard. Gear make too much noice and will break at some point
Two motors could be used in this test, but then they both would have to run at half power to give a fair comparison.
YES!!!! FINALLY!!!!
Contra should have a bit more aggressive angle blade on drive fan to accelerate the air flow that first fan create. would be interesting to see next version of it.
would be cool to see with some lightweight metal gears and a properly lubricated bearing would be alot of work but I think well worth it
I liked the idea until I got out the McMaster-Carr catalogue and realized the budget haha. Doable but not too cheap
it might be better to use pulleys, not gears.
@@nicksurfs1 why are you looking at an industrial part catalog lol, that's 500$ just to open the book
@@gangadin2873 My dad use to work on dentist hand pieces so I was thinking having some small gears with some very small bearings might work pretty good and quiet
@@redrevo_117 Dentists use pneumatic tools and they are quite noisy despite . They are ultrahighspeed and require torque, plus they have to fit within certain size. This is not the case for fans. The most these fans spin is 2000 rpm. Where as the dentist's drill is minimum 8000 rpm, maxing out at 250,000 rpm.
Gears would be fine if they are enclosed and lubricated in light machine oil. They can't be left open as they would catch all sorts of dust and dirt from the surrounding and clog up. That means building a tiny tiny gearbox and I am not sure anyone has the inclination to build a tiny metal gearbox for tiny metal gears and tiny oil seals.
Contra rotating props are fascinating to me. Such an efficient concept and I bet if you could tweak the tolerances enough to get a more precise fit or even find a way to seal the gear case so you could pack it with grease you could tighten up the tolerances just by doing that. Such a cool fan design! Good work, Selby!
For the next gear driven fan, I'd try some dry lube meant for bike chains, maybe even some wax-based one (there are some that come diluted in a solvent that evaporates somewhat quickly and leaves a wax layer). Mainly to attract less dust and, I assume, it will get flicked off less
PTFE spray. It's not wax-based. It's actually a type of plastic that's dissolved in alcohol. You spray it on and the alcohol evaporates leaving the very slick PTFE plastic surface.
It's a dry lubricant as well, but it won't have the stickiness that wax sometimes has.
Dry lube would be a bad choice for this application. Film lubricants don't decrease friction as significantly as oil lubricants, they're mainly intended for high-load applications.
This is a low-load application where you want to decrease friction as much as possible - almost exactly the opposite use case.
@@louisvaught2495 To be fair, PTFE is not your typical dry lube, I would think it would be in a different ballpark to any other sort of dry lube product. Brilliant because it does not attract dust and the whole "teflon" thing kind of speaks for itself
@@poo123444 Nope. PTFE has a really high COF compared to oil lubricants. Solid lubricants are for when you want some sort of lubrication under high-load conditions or something where you can't build a liquid film.
We're talking a couple orders of magnitude for a well-designed bearing. This won't be well-designed but I'd be surprised if it's higher than 1/10th.
@@louisvaught2495 Would it work to use both? spray the gears with PTFE, then lubricate with oil?
Try replacing the Cheater`s shroud with the Contra`s shroud. Basically just the Contra with the big box thingy from the back of The Cheater..
I mean having the counter-rotating thing on the Cheater
THE CONTRA CHEATER
I personally had been trying to think of how to make a fan like this since fan showdown started.
Counter rotating fans are so cool
And they can do over 4 times the thrust of a single one
I think that, in the name of fan/airflow science, there needs to be some Major -Hardware- Hardcore testing done with and on the Cheater Housing.
1] - tests to determine if the 'airflow straightening box' helps any (by itself), across a couple different fans to ensure consistency; flow tube and smoke
1a] - if it _does_ help, can it be made more compact, and by how much before the gains plummet significantly _(perhaps instead of printing multiple sizes, a full size is used and then marked with a ruler & sharpie every 1/8in, then use a belt/orbital sander to easily remove material between tests)_
1b] - one thing that might be needed on the box, in order for it to still perform at a fraction its current size, would be to double the vanes. As IIRCZ, it is just a simple 'cross' arrangement (2 vane; 4 chamber).
2] - tests to determine the benefit of the velocity stack (by itself)
2a] - can its size be scaled down and still be beneficial; ideally needs to be actually scaled-down models and printed, so maybe just 75%, 66%, 50% and extrapolate (guess) based on those results
3] - does using the flow tube's _own_ air straightening attachment skew results when the Cheater's is *also* installed -- I only mention this because I assume that's been left on the tube (and needed) in order to get proper CFM readings
The goal here, if it wasn't obvious already, is to try to make for a more compact and "reasonable" Cheater package. As it stands, it's not really viable for use in anything but open-bench computers where space isn't an issue.
Therfore, if the box can be effective still at 15% the original's size, and the velocity stack effective at 50%... _then_ we'd have something more usable inside cases! 😃
(not that I use a case, as I run an open bench; nor do I have a 3D printer either way... so this is just to maybe help everyone else)
🤘 Thanks for everything & ♥️
Could you accomplish the same thing with 2 A12x25s with the fronts facing each other and one fan printed backwards?
I think that because they wouldn't be synchronized it would likely cause problems. There's only one way to find out.
@@hellishinc why would syncronisation be a problem ? Air gets pushed by the front fan, and air gets pulled by the rear. Air is Air. The Air doesnt change characteristics because of the fans being synced ?
@@Joshua-uq9zw turbulence. There's more to pushing fluids/gases than simply slapping *on a spinny thing. As shown by all the different designs on this very channel.
There are a lot of contra rotating fans built that way that's used in servers and industrial equipment. Most of them are however only 40mm fans and are used in 1U servers where they provide a very high (for axial fans) pressure that allows them to overcome the restricted airpath in these servers. They are also incredibly noisy, but again, server...
Could you test something? Your numbers showed the contra fan added a small amount of CFM...but don't forget, the second frame had a wider inlet. Could you test just the pink fan but with the shroud of the blue contra fan without the fan attached.
I am willing to bet you'll see a small improvement from the shroud grabbing a slightly larger area of air which means it isn't the fan blades doing the work as much as it is the shroud.
Now just need to switch to helical gears for the noise...
Selby said he did try helical gears and didn't have as much success
@@MajorHardware yeah, the resolution would be an issue at that size
Helical gears impart much more axial thrust which causes friction. Along with the helical gears increasing friction too.
If it could be made with low friction bearings and thrust bearings along with polished metal gears then helical would be good. With the plastic it’s just to much friction once it’s loaded and trying to move air.
I'd be willing to bet that if you compared them with restrictions such as a radiator, the contra will outperform all others. Much more static pressure.
Literally just came back to your channel. Glad you finally went bald, you look awesome with that beard!
I knew something had changed but all I thought was "huh, his beard looks good."
The consumer: “water cooling is pretty much necessary to fully cool a modern CPU”
Some dude on Reddit: 😬
At the beginning i didn't even like the smoketest music much, but now I'm completely vinbin with it, and it makes me smile every time.
Love your content, and the 4k spices it up even more!
smoke test music is awesome....always feel like im playing Vice City.
Makes me feel like I'm gonna take a journey across Japan
give it 1-2 years and we'll have a contra gear fan beat the Noctua in sound and performance :P
Try the dual/contra rotating fan with the back Diffuser of the cheater maybe it will be even better
^this. The air is so much smoother with the cheaters back attachment!
Why does the music overlay increase the volume by 10000000%?????
Really dude...
That's awesome. We need ultra low resistance bearings and helical gears for quieter operation.
all I have to say about this fan is
HELICOPTER HELICOPTER
Been waiting for this! I do wish the planetary gears went ahead, because they are wicked!
This is one of the first times I've wanted a 3D printer after seeing something 3D printed. What a neat little project.
Thats such a cool design! While not mechanically complex, it is executed incredibly well!
I also wonder how other fans perform on the Cheater base - back and/or front attachment. Maybe as a final episode of season 4 we can test combinations of fans and attachments.
Contra fan was much better than I expected. I wonder if the secondary duct on the second part was just as helpful as the secondary fan - i.e. can you try it with a duct and without the gears an second fan?
What a triumph! This opens a lot of avenues for ambitious mechanical ideas for future submissions!
counter rotating props for boats are a very common thing you know
just saying it is actually widely used and might be a very good inspiration
Sup
Sup
Sup
Sup
sup
The smoke machine shots should have a black or at least dark back drop, instead of like here where the door behind is white and the smoke coming out of the fan all blurry is very hard to see.
I would love to see and engineered versions of these fans using clock bearings, it would be super quiet and run so smoothly
Just a thought, spray on Teflon based sliding door lube might work really well.
for a final version an extra motor would be "simpler" in the end than gears
this was my fav episode to day and I have really liked the last ones but this one! The ideas! WOW!
That's absolutely incredible. Selby did an amazing job designing it, and your printing skills really pulled it off. I love seeing the engineering that goes into some of these fan showdown submissions. I've got some ideas, too, but I just haven't had the time to sit down and work any of them out.
On a side-note that I don't mean to be a jerk by bringing up: "fitment" doesn't mean what you and other tech channels seem to think it means.
I'd say fitment has come to mean exactly what most people it means. Similar to "literally".
@@MrMeasaftw And I could say "IceMelon" has come to mean "someone who doesn't language."
But then we'd both be wrong.
At last, an answer to the problem of computer cases tipping over due to the massive reaction torque required to remain stationary when the fan turns on.
You should do a top 10 fans and smoke screen every so often 1 per season is good but I would like more then that
Ok, so now you just need 2 counter-rotating T33 fans in the cheater.
I wonder if you could make a fan that spins another fan using airflow alone...
Funny how this channel is slowly recreating jet turbine design...
Super awesome! Thanks for making this video.
Next video: 3D-Printed Jet turbine slapped on to a pc tower.
You should just call it "Contra-Fan", like a play on contraban
I am curious if the real difference with this fan is static pressure. I feel like there has to be a really high pressure caused by the contra gears
My man major hardware using that journey across Japan music.
That's just crazy! I love where this is going with creativity and communitiy cooperation! - How cool would it be if Noctua sponsored you and maybe, just maybe, made a real product out of it? Even if it was just some kind of "April 1st" product, limited eidtion but actually purchasable!
Oh, and a Gamers Nexus collab would be lovely too! ^^
Am I watching Journey Across Japan?
now imagine that fan with sealed bearings and metal gears that fit together tightly.
whats with that casual gangnam style insert lmao
Impressive. I enjoyed seeing your reaction to it as much as the performance.
I think if that's gear made from aluminum thats can be smooth
i used to do these counter-rotating (pretty much i call it a compressor like from jet engines) kind of fans with high rpm fans back when i was working retail pc shop. And damn these are loud. almost sounds like a roaring engine and the airflow was insane.
This channel you've created, is going to usher in a whole new era of performance PC cases. And they're gonna look sick AF. I can't wait
I'm sorry
But
Put the contra in cheater frame
What if you put the contra and put the cheater frame on it?
I have wondered if anyone tried to make a double blade like this. Not only is it two fans in one, but since they spin in opposite directions, it cancels out the torque strain on the motor.
Can you put the Contra and Cheater together please ^^
Try this: take the gears out, glue the blue. I think that will make it more powerful.
What a amazing and celebratory episode. I love how this channel is a forum for people all over the world to share their ideas. This is what science is all about. Its been great watching the evolution of the fans and I can't wait to see the next step.
My creativity increases every time I watch one of these Fan Showdown series. I've noticed that these ingenious design principles can apply to many other areas of life.
Nice! I'm glad someone made this fan. I had this idea when you first started the fan showdown because of the dual rotor RC helicopters I used to have.
Connect the Cheater to the Noctua NH-AAS
Whenever you want to introduce some kind of gearing system, your tolerances will need to get a lot smaller for it to work smoothly and reliably.
I wonder how it would perform with machined aluminium or steel gears?
Although I think the most ideal design for a contra rotating fan is to just not use gears, and have each one running with its own motor.
correct but plastic gears are reliable for low torque instances what he should also do is have a housing and add lithium grease of some form of thicker lubricant to quiet and take up tolarances
I'm a big fan of your fans...
;)
10:43
YEP !
you applied aerospatial tecnology !
yes, contrarotating propellers do a little more then normal propeller
infact MILITARY didnt want to use those more then normal ones (see "wivern" plane) because the tech was "useless" for military applications (in combat, too little advantage for a too complex tech)
but of course you did a magnific job \0/
all those more rpm and more air flow are fantastic for your CPU ^^
like indeed
(sorry for poor english, i dont like google for easy traslations XP)
for moving parts
try abra+ 70-30 at metaflux
teflon abrasive disc cleaner
gears, and bearings (if degreased), dust free
and ultralubricant facilitated many efforts,
increases yield in some way,
reduces noise
only drawbacks,
it does not last in time,
and you have to put a good squirt, that it cleans
if there is not in the 'zone
you should be able to find an equivalent in the USA...
(metaflux is a 'pro' brand)
That's very impressive, I wonder if you printed the small gears using a resin printer you would get more accuracy. Or perhaps even the entire assembly done that way. Also if you could use some very small bearings or even bushings for the small gears it would be a tighter fit and would spin with less friction.
Has anyone ever entered like a jet engine turbine design? With an intake and compression stage? That could be pretty interesting. Bulky though. This contra fan design is all things considering very slim. And I bet you could solve the noise issue with metal gearing and better tolerances. Very impressive.
This style of fan is used quite widely in low profile rackmount server gear. My Poweredge R410 has 7x 40mm fans comprised of two contra-rotating fan modules with air guides. They produce a ridiculous amount of airflow for how smallthey are!!
This is actually how my supermicro fans work on my SuperServer here at home. They have two 0.5A fans in a 40mm module counter rotating up to 14500RPM and they move a LOT of air.
The gear noise could be reduced if there were a way to make more precise gears along with a balanced gear train (two sets on opposing sides) to even out the thrust loading. Only issue is whether that would the friction increase from another gear set be offset by the friction decrease with improved load distribution throughout the drive? (Transmissions like this that see some torque have balanced drivelines in parallel for a couple of reasons, but these computer fans have barely any torque to begin with.)
you know what we all want... MERGE THEM! the CONTRA x CHEATER to see if the features of both improve each other, we know and you know we all want it
Fan makers, Noctua specifically, If you make one of these. I will buy 12. AWESOME project dude A sub well earned!
How is Selby's the "GOAT" if it's not #1? #1 should be the GOAT, because #1 is greatest in that kind of ranking system.
Nice! I'm glad someone made this fan. I had this idea when you first started the fan showdown because of the dual rotor RC helicopters I used to have.
great video! i recently did a video on my experience over the years at Fan expo here in Canada since it was a 25th anniversary celebration. Making the video brought back awesome memories of pre pandemic days
Okay idea:
T33 TwinCheater. Basically, take the Contra and replace the fans with the T33 design, then modify the Cheater housing to fit it.
Literal God fan.
You should definitely test the contra for its static pressure.
The Russian Tupolev TU=95 "Bear" also uses counter rotating props. Like this fan, its a pretty noisy plane with 8 props in total (2 engines on each wing).
Yeah, this was pretty interesting! So what would it take for you to show us that hybrid?
Happy 2202022 still, in some time zones!
server fans have this standard alot tho its not really that impressive :P
Great Video! Are you measuring current?
Consider krytox GPL 105 for lube. It's meant for plastics
Hi i'm new here and i really like this kind of fan, can i find project somewhere on the internet? I am asking because I am not at all talented in the 3D modeling :/