What If You Combined a BLOWER and AXIAL Fan | Fan Showdown S4E3

[@realgoose]

It’d be great to setup a “mini-season” where the submitted fans are from other tech YTers. See which channel can produce the best fan. Get all the big dogs along smaller channels looking to gain exposure. Could be an annual thing!

[@Ferrari255GTO]

That sounds dope

[@maxx1o1]

that sounds like something I'd watch on Christmas

[@RedShift5]

Some guys over at LTT would love to have a crack at this and for sure Linus is gonna go flat out

[@martsilv5303]

I would definitely watch some LTT vs Gamers Nexus showdown :)

[@slakk5093]

Great idea

[@ProjectPhysX]

As a physicist working with CFD, the innovative fan designs on this channel never cease to amaze me. Some are good, some are bad, and some are just crazy. There is always a lot to learn!

[@Kidozy]

that'll happen when it's not always engineers but creatives doing the job

[@jspanga]

you should submit a fan design as well then..

[@revrndcast3918]

Would be curious to see what a ML model would come up with.

[@ProjectPhysX]

@@revrndcast3918 me too! I've already seen AI-generated bike frames and other structures with minimal weight. These are crazy designs that no human would ever come up with.

[@BrianHegger]

@@ProjectPhysX AI has blown up since your comment - are you using it more at work now?

[@autisticChronicles360]

2:05 well, this was unexpected, but thanks for showcasing my design. For those who are wondering, CS64 is short for C-Star64 (not to be confused with "SeaStar"), my alternate nickname for Crosbyman64.

[@mrsnezbit2219]

Since you are a "fan designer" i have an idea i cannot draw myself. I've seen the Caterpillar fan and I'm curious to see what my car fan could do since It has a strange design. It's a 1965 fiat 1500 and the blades are 4 but not in a romanic cross, they are placed like a San Andreas cross and don't know why

[@gorinator]

@@mrsnezbit2219 The X shape is to allow access to the water pump and whatever else is behind the fan without removing it. You'll find access holes or gaps in all kinds of rotating items on vehicles, to allow access to fasteners without removing pulleys and such. No results for San Andreas cross, it looks like you mean "St Andrews cross", like the flag of Scotland.

[@mrsnezbit2219]

@@gorinator yes I'm Italian and it's called "croce di Sant'Andrea", didn't know how it was in English. Thanks for your answer, now i know why even if it's still strange because it takes like two minutes to remove the fan

[@afroteddybear]

Would love to see the Caterpillar used as a radiator fan; PC radiator, I mean. Also, the "Double duty" might also do well as a heat-sink/ radiator fan, with how much spread it creates.

[@mattf9096]

The flip side would be to take the best performing fan and upscale it to engine size to see how that does.

[@glenmcgillivray4707]

I thought the double duty had a pleasing sound and looked to produce quite a nice static pressure. However it didn't take advantage of the full width of the rear of the fan profile, a longer axial component to shunt air around the hub would have been effective

[@jonperez8513]

@@glenmcgillivray4707 I feel like the double duty fan did a great job sucking up the outside air and then dispersing it inside the case hypothetically.

[@revrndcast3918]

4:55 I feel the double duty needed more pitch on those inner blades to pull more through the centre. Something akin to the inlet vanes on a commercial airliner.

[@glenmcgillivray4707]

@@revrndcast3918 the inner blades are feeding a centrifuge, the air moves outward due to momentum as it gets pushed by its own mass as it accelerates. The problem here is that the maker chose to expand the ring All the way to the rear of the fan, which reduced the available area at the rear of the fan to let air exit, which will stifle airflow due to ducting issues. The only fix would be to break open the ring into narrow channels to make the exit vents that spin, or to use the static pressure built to directly duct to the rear instead of trying to continue to accelerate the air more and lose drainage area. I do not remember enough to estimate the area needed to ensure sufficient exit area given surface effects and flow parameters, but the larger available area for the external fan to draw and push through will compensate Which is to say, probably you need to feed the output from the core dome directly into the external blades as a two step process, except that air on the outside of the dome needs to get drawn into the external blades too. So some kind of vase fan again I suspect. With better flow management.

[@madeintexas3d442]

You need. To send a few of the top ones to gamers Nexus once he gets his fan testing setup up and running. That would be a cool colab.

[@brendanloconnell]

I think it would be really interesting to see the static pressure generated by these. I'm thinking the double-duty in particular should shine due to the high blade count. While CFM is useful, high static pressure fans can be really important in some builds.

[@l0I0I0I0]

Hi Murphy. Was wondering, high static pressure is best for creating a vaccum or high pressure? Is it also what is sought-after in turbines for creating electricity?

[@fookingsog]

You can always 3D Print a stationary reverse vane static boost plate to add to the stack!

[@wrlprchnx]

@@l0I0I0I0 It's because fans are basically air pumps and operate on pump curves. The higher the system resistance (essentially the more pressure loss that exists in the system - losses occur with changes in direction, or having really long ducts, or obstructions) the less airflow a fan will produce. Axial fans are generally much more efficient than centrifugal fans at a common operation point, however axial fans have an issue when the system resistance gets too high - at high enough pressures the fans go into aerodynamic stall which basically kills their performance on top of being destructive to the fan itself. The double duty fan is likely to perform much better relative to the other fans when operating at a higher pressure rise - I.E. if the fans were drawing air through a thick radiator coil it's likely that as the radiator coil got thicker the double duty fan would eventually produce the most CFM as the axial fans started going into aerodynamic stall and stopped producing any real airflow. For power generation you bring high temperature/highpressure steam into a turbine, as the pressure forces the steam through the turbine it causes the turbine blades to rotate (bleeding the energy off the steam) - rotating blades are connected to a generator to produce electricity - Fundamentally this isn't very different from a fan except the turbine blades are being driven by the mass flow through them rather than the opposite. Designing your turbine blades is about designing the stages of the turbine such that the blades efficiently capture the streams kinetic energy - turbines have many series of blades in them because the front of the turbine is much hotter/higher pressure vs. the back of the turbine which is lower pressure/cooler.

[@l0I0I0I0]

@@wrlprchnx Nice! Thank you for the clear distinction between axial, centrifical, double duty, and steam turbine fans. I work on jet engine fans a little bit in the military but mostly electronics. I partnered for a time with a turbine blade PHD professor at Ivy league university, but I was mostly focused on the finance. It's very interesting. Thank you?

[@plav032]

I'd like to see how the Double-duty would fare in a thermal test. Centrifugal blowers require some kind of resistance to build pressure, it would probably do great on a cpu cooler. Also would be cool to see this get a V2, using some of the techniques from the cheater with a velocity stack and a exit duct/diffuser.

[@ARockyRock]

replying to boost

[@renyn21]

I watch this from time to time when I need to put my mind on break so I don't know every change. I was surprised when the video ended without a cpu temperature test. Just a tube with a cfm reading won't do all the designs justice is what I thought. Sure takes more pressure to move air thru a dense heatsink or radiator than that anemometer.

[@Timberwolf69]

"DoubleDuty" seems to suffer a bit from its central blower part blowing the air out in an angle to the centerline. I wonder if there is a way to design those blades to get a more parallel flow.

[@NarutoMagicCyclops]

considering the rather large cavity between the hub mount and where the central blower "vents" are it might make more sense to widen the vents closer to the hub and increas the size of the blades, might be an interesting V2.

[@KatanaBart]

I could be wrong, but when he showed Double Duty originally it looked like it would scoop the air and compress it into the center instead of flinging the air out and then down like it's supposed to.

[@NarutoMagicCyclops]

@@KatanaBart it's definitely going more outwards but there is that little funnel between the two showing a clear difference in air speed, it's likely the centrifugal fan is trying to shove the outside air away.

[@Arutemysu]

While the outer blades should point counter clockwise, the blower fan should point its blades clockwise. If blowerfans scoop air like normal fans they trap air in the middle.

[@Craigineering]

I’m also leaning towards the blower fan being incorrect for the desired airflow.

[@arson8582]

Finally an in video ad I 100% appreciated. Much needed. Ty.

[@bobiseverywhere]

I would like to see how well the double duty would perform on the old setup.

[@BState]

The Double Duty's central centrifugal part (its blades) should be set to the opposite spinning direction or straight.

[@HelloKittyFanMan]

As well as having a notched area between the blades and the hub so that air can be sucked into the center and blown out more easily.

[@winstonbattle]

I don't know why I'm addicted to watching these...EVERY SINGLE ONE...ugh.. :D

[@ComgrowOfficial]

Always a pleasure to see the creativity that the 3D printing community has, and the smoke tests more! Keep up the great suggestions to keep FS alive and well.😆😆

[@_miobrot_603]

Always a pleasure to see the creativity that the 3D printing community has, and the smoke tests more! Keep up the great suggestions to keep FS alive and well.

[@tiamatlures651]

Give us the Slug back!

[@MykeBinaryMan]

Sadly being the UK I have never visited a real microcenter. Never got into 3d printing but damn this series is so fascinating to watch.

[@keatoncampbell820]

For next season, I know it's early to think about but I got a recommendation for an older video, you should use that rc motor hub you made, have a season where the fan rpm is 10,000 or 5000 or something else ridiculous. It'll change the aerodynamic profile a lot, and we can see interesting results for things like aerofoil and fin design as well as shroud and drag reduction

[@FinnishArmy]

I'd love to see chapters implemented. I'm honestly mostly just interested in the smoke tests more than anything else.

[@johndough8115]

PLEASE show the RPMs of each fan. Its my belief that some of these designs may be superior in air movement.. BUT... due to a slightly heavier weight... they are causing lower RPMs as the motor struggles to move them... thus reducing the total output potentials. It would be good to see if the motor was struggling, and how it effected RPMs and Air movement.

[@HubrisInc]

RPMs are displayed when he introduces them; watch the top left corner

[@spayced]

Ya that's why fans that have support structure struggle to perform well. A lot of extra weight that does not contribute.

[@rtyzxc]

Weight doesn't affect speed, only initial acceleration. Speed is determined by the work the fan has to do to push the air (which can be more or less efficient).

[@NarutoMagicCyclops]

@@rtyzxc Weight doesn't affect true, but it does affect the life of the motor and does cause extra wear and tear as time goes on. The especially heavy fans do also show performance reduction and reduced speed as the motor only uses up a certain amount of energy.

[@RodBeauvex]

Two important points I don't see touched on is number of blades and pitch of blades. These two factors have to be tuned to the motor driving them.

[@neth77]

Best segment ever made, music and smoke.

[@alewers3326]

Sound on the handifan makes me think of wind through trees up on the mountain, or maybe water falling through a small cataract in those same mountains. Kinda relaxing.

[@Old_Man_Pete]

Regarding your opening statement, this is my favourite fan showdown channel 🤣👍 Edit: Idea for the next series of the showdown, have the fans attached to an actual heatsink so we can see smoke movement through the fins.

[@JazzbLu]

I like the idea of the double duty! I think the the blades have way too steep of a pitch, straight up and down and not slanted enough. It would be really cool if you could take half the pitch off and try it again!

[@zuzufinke4300]

Your one of my favorite KZbin series. Keep up the great work!

[@electronash]

For anyone wondering about the inspiration for the song during the fan test montage, I think it's safe to say "Living In A Box" (by Living In A Box) is the main one. lol

[@thefenlanddefencesystem5080]

From the album 'Living in a Box'. Which at the time was living in a sleeve. Living in a cardboard sleeve. (Unless bought on cassette. Living in a plastic box.)

[@electronash]

@@thefenlanddefencesystem5080 lol

[@homelessEh]

..this channel is the strongest influence on my person to obtain a 3d printer.. too bad im canadian and work a job..so its 3rd world livin here workin for the man in the power plantation.. every thing i get goes to millionaires around me... so i am rendered broke Every pay day but for the things required to keep my enslavement going...

[@Ferrari255GTO]

The fact that the handy fan isn't garbage is surreal to me

[@speedracer9132]

The CF64 looks like it captures the most smoke

[@autisticChronicles360]

Lol. It performed decently, at least. Not the best, but it still did good.

[@forceablepizza764]

the cfm board is cool and all, but why did we stop doing thermals? just because it has a high cfm doesnt mean its actually better at cooling

[@mattg8116]

Well yes, but given that the area available is the same, cfm can be reduced to velocity and if temperature and density of the air is maintained then velocity is the only remaining relevant cooling factor. I think it would be worth noting the power consumption of the fan as a factor of it's cfm though as an additional metric.

[@prydzen]

@@mattg8116 the area is not the same though you can see it in the smoke test. This is important for radiator fans. Also density is obviously not the same but is again important in how much heat can be transferred from components.

[@mattg8116]

@@prydzen I don't think these fans are producing any significant compression that could effect the density meaningfully. The area of high speed flow sees variation. My point was that it's somewhat accounted for in the CFM calculation. That said, the extreme ends of the flow profile for the same CFM could generate different cooling performance, I guess I just don't think it's that important to parse out until the top performers are all at a very close CFM.

[@pvic6959]

was just wondering this lol. its not an an apples to apples comparison. he should either start a new ranking or he will have to retest all the other ones to have the same comparison

[@rsmssnpdr]

I think you could say this is KZbin's "fan" favorite series

[@wizardwithsmg]

I was really hoping Double Duty waa going to have amazing airflow. That design would look great in a build.

[@tendermoza]

finally!! biblically accurate fan!

[@errantpursuits4249]

I would like to suggest you set up a 2'x2' clear acrylic sheet to mount the fans to for the smoke test. It will neatly highlight how the airflow impacts on the side of a case vs flows through for cooling and more accurately simulates real airflow dynamics on a system

[@broggyr]

I literally LOLed when you swung your hand up and down during the hand fan segment :)

[@Relfar2]

KZbin's... Fan Favorite 😎

[@Thomas-vj3jg]

At first I was skeptical but I have to admit I’m a fan

[@ragetist]

When you talked about handfan and something we're probably all did as a kid I was thinking about the classic James Bond karate-chop 😂

[@tay802hall]

I knew exactly what the 3406E fan was. That is cool someone used that engine as a reference. Worked on a few of them.

[@GabrielCarvalho-gd8op]

I don't like to complain about your videos, cause they are fantastic, buuuutttt.... I was very disappointed when I didn't hear a diesel engine during the caterpilar noise test. Keep the great work!

[@nesyboi9421]

This

[@HelloKittyFanMan.]

LOL, you "expected" the Handy Fan to sound like clapping, haha!

[@McTwistedTwisties]

love the handy fan, if you ever make low power builds, I think odd shaped fans are super cool because it doesn't really matter right?

[@B0Oty]

Whenever I see the smoke tests on the fan showdown I always just like to think of James absolutely blowing clouds with a vape. A man can dream.

[@JASPACB750RR]

@ 8:02 when the beat starts to kick in. Ooohh yeah baby! Smoke test and some Mattie McGuire.

[@monkaeyes3417]

Can we see two of the same fan, one with and one without an outer ring? Just to see if it makes a difference

The caterpillar flow was sooo satisfying!

[@lazybonesftw9433]

It might not be KZbins favourite series, but... its my favourite series on KZbin... keep up the good work... one day i will send in a fan, till them il just remain a massive fan😅...

[@greywolf2809]

I actually love this series

[@Lorten369]

Yes finally. Have been thinking about how my hand "Fly/float) ever since this series started. I'm commenting ½ way's in so hope it's gonna be awesome 👍🏻

[@0zux45]

Love that your image in the microcenter Ad still has the ATI logo on display :D

[@nobodytoyou4887]

Micro Center's Inland filament is wonderful for the price prints great for me.

[@DSdudegaming]

Might not be KZbin's favorite series, but it sure is mine

[@marsaustralis6881]

Double-Duty seems like a good basis for a very quiet 30mm fan (maybe test the concept on the Phanteks T30, assuming identical hub size). I wonder how well it'd perform vs the Noctua at identical RPM.

[@Unethical.Dodgson]

The hand fan thing just reminded me of that time you said everyone should know what the Tesla wheel fan design was. Even most people that know what a Tesla looks like don't even remember what the wheels look like. I also don't recall ever doing the hand thing in a car but yeah XD

[@Lil_Puppy]

That subliminal "subscribe" that pops up for a quarter second just before the smoke test. hahaha Microcenter is a pure brick&mortar and will never move on to become a giant, my nearest one is 800 miles away. Anyway, love the series, keep it up, the creativity of public sourcing innovation is really nice.

[@tuckersossaman4485]

I just dont know why this is so entertaining to me lol

[@dhgodzilla1]

I gotta Hand it to ya, that is a Catchy Fan

[@singlsrvngfrnd]

The explanation for handy fan was goin south real fast..... But then it caught the jet stream right outta the gutter.

[@northwiebesick7136]

Lol... When I hear handy, I definitely don't think about opening a window... Opening a fly, maybe, but not a window...😂😂😂

[@singlsrvngfrnd]

@@northwiebesick7136 glad I'm not alone 🤣

[@KRAVER_]

Handy Fan really grabs the air nicely ;)

[@guilhermecoelho5028]

Yep this is my favorite youtube series! Love the content man =]

[@ZaximusRex]

Sticking your arm out of a moving car window is a great example for explaining how lift and drag work on an elementary level. Never though about using that as an example before your explanation of the fan.

[@CGrahamWorks]

Hey, I was thinking for another season you should look at power consumption vs cooling. An efficiency module as I think some of the fans work well but would seem to draw more power due to weight or drag

[@jasonwoody8041]

Didnt know you were in my neck of the woods, lol. Thats my micro center too. Love that place.

[@EatonBacon]

REF 04:56, "Normal Blades go round the Outside, Round the Outside, ROUND the OUTSIDE. I'm Double Duty, will the re real Fan Show, Please stand up? Please Stand Up!"

[@thegrafxguy1]

i dig the Inland filament. good stuff! i'm going to miss having one close by when we move soon.

[@BryanTorok]

While CFM is a good place to start to quantify the operation of a fan, you also have to consider the CFM at various static pressures. Regardless of how open a case is, there is still resistance to the movement of the air. Traditional axial fans tend to move a greater volume of air but the air flow falls off quickly if there is any back pressure or obstruction to the air flow. Blower type air movers will typically build more pressure and push the air against a resistance.

[@davido9208]

The handy fan should be renamed "the fresh prince" lol

[@scottchladek1770]

Thanks for another fun video. I was slightly disappointed that there was no cut away to meme for "round the outside " for the double duty fan.

[@oxseth87]

Yes! KZbin favorite series!

[@WILDouglash]

I was JUST thinking about the fan showdown and the al gor ithm delivers.

[@luke144]

I really like this channel! Mad love my friend.

[@mr.cantsay]

Micro center sounds cool. I hope I get to see one.

[@Xyolyp]

I'd love to see a cooperation with Linus Tech Tips where the best fans of each season or overall are run against each other to cool a real top spec computer

[@xymorm]

you want to see how they compare on cooling a water loop

[@edwinooi9166]

That handies fan awakens my inner Godrick, who is going to model a grafted fan?

[@donh8833]

If you want to get really good airflow, put a 3 degree divergence cone on the backside of the fan for about 3" (The longer the better, but the more controlled the laminar flow is on the backside, the less pressure loss there is)

[@spoofyoriginal]

I dont know shit about anything but this makes me feel like im learning something

[@La_sagne]

4:49 "around the outside of the double duty you'll find.." me: "2 trailer park girls?"

[@donqpaul5551]

I'd like to see a video on the difference between a standard 3D Printed Fan and Smooth Sanded 3D Printed Fan.

[@gabipo6985]

i hope micro center is reading this bro we need you on puerto rico all the tech stores here sucks

[@hirsyamjamali2563]

How is it that I never knew there is such a channel? I really need to start digging deeper into youtube for quality stuff like this...

[@Skyfighter64]

The single biggest thing that makes the "cheater" work better is NOT the fan itself, or the intake funnel. It's the nozzle on the back end, providing a Bernoulli effect, meaning the air flows neatly through it, rather than the turbulent airflow of only coming off the blades of the fan. It's very similar to, but not exactly the same as "laminar flow." The principle in this case being that a stream of air will follow the surface of an object it passes over, up to 90 degrees. Going around a Fan hub, that's a really sharp angle for air to follow around, so it tries to follow that sharp bend, but can't fully, not only losing a good chunk of the speed it had coming off the fan blades themselves, but causing turbulence in the post-fan airstream, slowing down the rest of the air coming through the fan. Since fans rely on a difference in pressure to operate, this cuts the efficiency by a LOT. Of course, the fan hub being such a large portion of the far area itself, just compounds the issue.

[@kens3dandaquatics]

Hey that's my local micro center! Tho the in store vedio is not actually the Madison heights interior, was still cool to have some michigan love in the video!

[@nano0203]

I think.. 6 slim fan should switch places with 7. Less rpm and dbm👍 Love the series BTW!

[@scotttod6954]

Thank you for the distraction. Really enjoy this series.

[@KevinBein]

Seeing that incredibly ridiculous fan that I designed up there just made my day. My goal was just to make the most absurd fan possible that somehow actually functions...at least a little. Maybe next time I will try to make something more function oriented... or possibly even more ridiculous.

[@DUKE_of_RAMBLE]

Re: Microcenter ad... Interestingly-curious that the in-store banner (thingy) with all the company names, still rocked an ATi logo 🤘

[@MrMartinSchou]

That Handy fan slaps.

[@Rabbid0281]

I wish MC would take over the old Frye's in Arlington, TX. Looks a lot like yours. The one in Dallas is super crowded and has probably 1/4 of 3d printing support that your appeared to have

[@bluewales73]

I love to see the blower type centrifugal fans. I think they're neat. However, they never seem to do as well. I guess because the inefficiencies of redirecting the air an extra 90 degrees are too hard to overcome

[@HelloKittyFanMan]

I was just rewatching this and I thought it would be nice to see you make a version of Double Duty that has its centrifugal blades reversed for CCW spin as seen from the hub side, because counterintuitively, since the motor has an easier time spinning centrifugal blades that go right up or close to the center when they are curved backwards from the spin direction (as opposed to squirrel-cage fan blades, which are curved towards the spin direction because they don't go very close to the center), it can actually spin the fan faster to make up for that backwards curve and end up moving a lot _more_ air, making it much more efficient. As well, will you please notice that the blades actually taper down to nothing or nearly so in the center? Because that gives air a better pathway to be sucked into the middle (see a typical vacuum-cleaner fan for the taper shape). And wanna call it Double Duty 1.5 or something like that?

[@white_mage]

3:37 i though he was going to mention the dr. evil rocket lmao

[@EricErnst]

The cat 3406c engine is 893 cid. 14.5L. They're monsters. I love driving them. I think the 3406 went as big as 928 cubes and 15.2L. Yeehaw.

[@EIGHTMAG86]

From Software has entered the fan showdown i see , i bet you Miyazaki sent that fan design in lol

[@SunnyOst]

Never stuck my hand out of a moving vehicle, always thought people just moved their arms up and down themselves, like idk drawing a sinusoid or pretending to be a plane is more fun? You blew my mind that the wind is moving them by just changing the angle, I'll have to try it asap

[@null_data]

The caterpillar sounds exactly like my Mini Cooper lol. My low power fan resistor is shot, so my car overheats at idle and the high power fan has to kick in and save me. I immediately went into **panik** mode when I heard it.

[@matthewnardin7304]

Wish the smoke test was a little more controlled. Like maybe have the smoke go through a tube instead of a random cloud. Doesn't really matter though, these videos are awesome as is.

[@extremecaliber2662]

I was thinking the same thing; that the smoke should be controlled. But when I think about if it was in a tube, we wouldn't get to see the fans pulling air into a cone, I just can't think of a way to make that shot possible

[@KatanaBart]

@@extremecaliber2662 Maybe put the fan assembly into a cutout in foam board, just to keep the smoke from passing the fan?

[@eivis13]

it looks like the ccf would be a great case fan for a rear exhaust fan when the rear is faced to a wall. Fun fact, cold air compressors reduce heat in a similar pattern. The caterpillar performs like i'd expect an engine fan to perform - throw a lot of air into the block. No point in a vehicle to cool the engine bay.

[@bohkory2690]

Ty for the show & research ama subscriber. I just watched a show where gentlemen tied 3x electric motors in sync with a head gear assembly. Curious about fan performances all over again. Guy claimed 40k rpms, which I felt was blatantly false. If anything 3x "general" would be 12-16k. "I would like to see" therefore how much more FPM can be attained using this new tri-electric motor configuration, as batteries will eventually catch up somewhat someday moreso than today (2022). -Boh.

[@server642]

Three motors driving one spindle would also allow him the possibility of printing some designs larger to see how much air they can really move. I hope he can try this out sometime! Lots of new things to explore, including the efficiency in the gains in power from 3 motors!

[@Cwronaga216]

Even though the double duty get it moved as much are it looks like it did a better job at channeling the air

[@-NGC-6302-]

Ah cool I was hoping to see a fan that includes the shroud in the spinny thing

[@nesyboi9421]

Oh my god as soon as you showed the Caterpillar fan all I could think of was a yellow and black Caterpillar themed PC build, and when you turn it on it makes a diesal engine startup noise. Oh I so want to do that now