3D Printed Air Engine V2 - Upgrades

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  • เผยแพร่เมื่อ 20 ก.ย. 2024
  • In my last video, I showed the development of my version 2 engine. In this video, I've tried to make a few improvements such as designing a flywheel (rather than using a desk fan blade) and reverting back to a BB ball to reduce the amount of air that leaked through the valve.
    This version was a huge improvement, at least in terms of engine speed, compared to the previous engine which had a peak RPM of 435. When this engine was operating with the lightest flywheel, the RPM was at least 5000, and even with the heaviest one, it was around 3,600.
    This will likely be the last update on this particular engine, as I have some new engine designs I am working on and they will (hopefully) outperform this one.
    I'd love to hear your thoughts in the comments!
    -----------------------------------------------------------------------------------------------------------------------------------------------------------------
    Music
    Randy Butternubs - Dyalla
    Benji - Dyalla
    Hippo - Dyalla
    Road Trip - Slynk

ความคิดเห็น • 132

  • @volatilesadness1486
    @volatilesadness1486 3 ปีที่แล้ว +19

    I think you are gonna go big someday soon

  • @BogdanTheGeek
    @BogdanTheGeek 3 ปีที่แล้ว +12

    Couple of ideas:
    - look into a pressure regulator/ governor to keep the pressure relatively constant.
    - put a rocket nozzle on the exhaust port to accelerate the air coming out which could create a vacuum and suck the piston up. If nothing else it will look cool af.
    bonus: print the gasket out of tpu. I could post you some printed ones if you wanted.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +3

      Thanks for the suggestions!
      Pressure regulator is something I'm looking into! should allow for a much longer duration and more consistent performance.
      If I constricted the exhaust using a nozzle it may actually have the reverse effect and limit the amount of air that can be exhausted which could cause the cylinder to still be pressurised after exhaust, the exhausts atm are 2mm diameter and I have a sneaky feeling they may be undersized, so improving the exhaust is something I'm thinking about!
      What benefit would a tpu gasket have over rubber?

    • @BogdanTheGeek
      @BogdanTheGeek 3 ปีที่แล้ว +2

      @@kurzey8532 its faster to print a gasket than to cut it :). You dont need to constrict the exhaust in order to get the vacuum, this is basically a 2 stroke so see how they tune their exhaust pipes to get the resonace which pulls the exhaust out.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      @@BogdanTheGeek maybe it would be if I had a printer set up to print tpu, but I only have my lonely ender 3 🤣
      Ah okay I see what you're getting at, I'll take a look👌

    • @BogdanTheGeek
      @BogdanTheGeek 3 ปีที่แล้ว +1

      @@kurzey8532 if you ever need a set of gaskets 3d printed I can print some for you free of change, you can find my email address at lostcontrol.industries

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      @@BogdanTheGeek thanks Bogdan!

  • @lordoffatcats
    @lordoffatcats 3 ปีที่แล้ว +16

    These videos are entertaining as hell

  • @liam3044
    @liam3044 3 ปีที่แล้ว +15

    For once TH-cam actually recommended a good video.

    • @laurenpinschannels
      @laurenpinschannels 3 ปีที่แล้ว

      I got here by vigorously seeking out low view count videos, especially ones older than a week. it's a good strategy and the recommender is smart enough to *mostly* figure out what you're trying to do as long as you're consistent about it. still has a hard time getting outside my interests, but still finds good content

  • @CamdenBowen
    @CamdenBowen 3 ปีที่แล้ว +3

    Neat video! Impressive how you were able to print threads into the output shaft and the flywheel!

  • @lazergurka-smerlin6561
    @lazergurka-smerlin6561 3 ปีที่แล้ว +3

    Probably good idea to have a non cirular end on the crankshaft.
    Also instead of securing with screwthread rather just have like a paperclip that you push through a hole on the end of the bar and then bend to block the flywheel from flying off.
    I honestly could probably go on as pneumatic engines really do interest me.
    But keep up the good work!

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      That's a good idea, never thought of using a paperclip or thin wire to hold it on.

    • @lazergurka-smerlin6561
      @lazergurka-smerlin6561 3 ปีที่แล้ว +1

      @@kurzey8532 Well now you've recieved it! One issue with that though could be that it could easily cause vibrations by being offcenter if you do it wrong

  • @TurtleMasterFlex
    @TurtleMasterFlex 3 ปีที่แล้ว +4

    Just gotta say, you're doing fantastic man! I love your videos as the editing is unique and spot on with the kind of content I enjoy. keep it up! i'm looking forward to the day you hit 1k! 5K! 50k! It WILL happen, just give it time

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +3

      Thank you Anthony appreciate that!!

  • @adammortimer1637
    @adammortimer1637 3 ปีที่แล้ว +9

    Another great video! I'm looking forward to the next engine design, well done on improving your designs progressively

  • @miklosugranyecz1717
    @miklosugranyecz1717 3 ปีที่แล้ว +1

    I just realised your subscriber count is not in the thousands,from the content and quality of your videos I expected your channel to be much bigger,I hope you can achieve that one day.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      Thanks man appreciate that!

  • @ShubhamBhushanCC
    @ShubhamBhushanCC 3 ปีที่แล้ว +26

    You need to work with Tom Stanton he is trying to make an air engine powered aircraft. I think you can really help him out

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +14

      Tom's last diaphragm engine was epic, don't think he needs my help tho, he's the go to man for air engines 🤣

  • @samuellaporte439
    @samuellaporte439 3 ปีที่แล้ว +4

    Keep the good work bro. The videos are very entertaining and I hope you become big someday

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Glad you enjoyed the video!

  • @accelerator397
    @accelerator397 3 ปีที่แล้ว +1

    Thanks for giving knowledge I can randomly bring up to a stranger out of nowhere

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      You're welcome 😏

  • @GopnikStar
    @GopnikStar 3 ปีที่แล้ว +5

    Oh damn, +70 subs from when I subscribed yesterday, I think the youtube algorithm likes you

  • @Vizzix
    @Vizzix 3 ปีที่แล้ว +2

    I can see a bright future for you

  • @fpvrccar2355
    @fpvrccar2355 3 ปีที่แล้ว +2

    I can’t stop watching these videos good stuff keep it up mate

  • @xDosDRB
    @xDosDRB 3 ปีที่แล้ว +6

    Epic video as usual keep it up buddy!

  • @AshleyJColeman
    @AshleyJColeman 3 ปีที่แล้ว +1

    To help balance the stress on the axle, you could split your flywheel weight between the front and back of your engine (2 wheels). No point once you attach it to a load, but while you are prototyping it will give you a much more stable output.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      never thought of that, an interesting idea, thanks Ashley!

  • @DamacusSquared
    @DamacusSquared ปีที่แล้ว +1

    Get or print a mower blade balancer so that you can check and correct the balance of your fly wheel, weigh the screws with the nuts one by one with a gram scale and place ones with the same weight opposite one another, check the balance of the fly wheel in different configurations and adjust is so that it has better balance. May have to drill small divots or holes in it or press in small pieces of metal wire to get it just right. That should help reduce vibration

  • @Vule_20
    @Vule_20 3 ปีที่แล้ว +1

    I love to see your channel grow!

  • @BartJBols
    @BartJBols ปีที่แล้ว +1

    You can make the crankshaft stronger when printing vertical by making them hollow and pushing in a nail.

  • @macbirdracing
    @macbirdracing 3 ปีที่แล้ว +1

    Your gonna go big! Great videos

  • @bl00dh4nd4
    @bl00dh4nd4 3 ปีที่แล้ว +2

    Good shit bro, keep the good content up

  • @kentil_soup
    @kentil_soup 3 ปีที่แล้ว +2

    Your channel is starting to pop off man, commenting for the algo haha

  • @jakearthur1246
    @jakearthur1246 3 ปีที่แล้ว +2

    Commenting so everyone knows I was here before this channel blew tf up, love the content

  • @mgmg.okayun
    @mgmg.okayun 3 ปีที่แล้ว +2

    Your video will be useful.
    Thank you very much.

  • @oxidelayer7699
    @oxidelayer7699 3 ปีที่แล้ว +1

    Good sh|t cuz. First time seeing you and subbed 😎🤙
    This channel is gonna get big

  • @ferraristahd1661
    @ferraristahd1661 3 ปีที่แล้ว +1

    Good job man! I am pretty sure that you should reduce as much as you can the vibrations, as they drastically reduce performance and reliability.
    i suggest you to put another bearing at the other extremity of the crankshaft and to make the engine block in such a way that it makes contact with the bottom part of the engine.
    Keep up the good work!

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      Thanks man!
      There is another bearing there, you just may not be able to see it in the video. There may be some play between the crankshaft and the bearing so it doesn't rotate perfectly which I need to fix.
      What do you mean by make the bottom part contact the engine block?

    • @ferraristahd1661
      @ferraristahd1661 3 ปีที่แล้ว +1

      @@kurzey8532 I'm sorry😟 I didn't notice it, my bad. Sorry for my english, I'll try to explain better: "i think that, for structural interity purposes, you should make the bottom half of the engine block in such a way that it touches the cilinder. This way, if you tighten the screws, they don't bend the plastic and the resistance of the parts is heavily increased

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      @@ferraristahd1661 no problem probably wasn't very clear!
      Ah yess I see what you mean and it's a valid point the gap is too large. The reason for the gap was so the screws can clamp the two parts together to secure the bearings (which clearly didnt work very well lol)

  • @batorboulanger6497
    @batorboulanger6497 3 ปีที่แล้ว +1

    Cheer up! Your video are great and useful!

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Cheer up? Do I seem sad 🤣 thank you tho!

    • @batorboulanger6497
      @batorboulanger6497 3 ปีที่แล้ว +1

      @@kurzey8532😅sorry is not what I want to say... . I want to wish you good luck for the future and that your channel grows as you wish.

  • @BlackCatRedScarf
    @BlackCatRedScarf 3 ปีที่แล้ว +1

    That was fun. Keep up mate! I hope you can improve the design or try new stuff, like a radial or even a rotary compressed air engine. That's such a great beginning on TH-cam. I really hope your channel grows up. ;D 👍

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Thank you! Yeah that's something I'm going to look at in the near future hopefully!

  • @daylenhigman8680
    @daylenhigman8680 3 ปีที่แล้ว +1

    what people don't really think about is how useful these would be for scuba divers, need extra power or speed for an emergency? Use an air engine, they almost always use compressed air anyways

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      I've never thought of that either, quite clever.

  • @rb3020
    @rb3020 3 ปีที่แล้ว +2

    If possible I would suggest a constant source of lubrication flow for your next engines to serve two perposes cooling and lubrication. I believe this will increase reliable and reusability of the engines.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      Now we're getting complicated 😏 I would be interested in trying this just to see if I get it to work lol
      Thanks for the idea!

  • @tartuffcramoisis6431
    @tartuffcramoisis6431 3 ปีที่แล้ว

    i find your videos in youtube recomendations..... your montage is very basic but i love how it is !!!!! nices vids !!!!

  • @xnecron99
    @xnecron99 3 ปีที่แล้ว +1

    You're going places man

  • @quackduckface
    @quackduckface 3 ปีที่แล้ว +2

    i think you should do some balancing on the engine so it doesnt waste so much energy shaking itself, that may considerably increace the RPM

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Yeah it is a shakey boi, there was play in the bearing and crankshaft which didn't help and could probably redesign the crankshaft to help somewhat. I think there will always be this issue with a single cylinder as there's no opposing cylinder cancelling out the force, but it could be improved for sure 👌

    • @quackduckface
      @quackduckface 3 ปีที่แล้ว +1

      @@kurzey8532 yeah, and yours wont be easy to stabalize either way cause the valve is offset by an odd degree? so even if you add balansing elweight you may still end up with wobble forwards and backwards... few engine layouts are perfectly balanced, but im sire you can figure something out that will work in a future version 😀🖒

  • @mgmg.okayun
    @mgmg.okayun 3 ปีที่แล้ว

    日本人でこのチャンネルを見てるの俺だけか。
    この動画はとても面白かったです。

  • @_edd.ie_.o.8101
    @_edd.ie_.o.8101 3 ปีที่แล้ว +1

    I'm once again asking for more content 😂

  • @rty0m
    @rty0m 3 ปีที่แล้ว +1

    Nice!

  • @marcelogaio3641
    @marcelogaio3641 3 ปีที่แล้ว +1

    Awesome job. You should get a resin printer.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      I would love to get one!

    • @marcelogaio3641
      @marcelogaio3641 3 ปีที่แล้ว +1

      @@kurzey8532 Post a Paypal address for donations!

  • @bobbiac
    @bobbiac 3 ปีที่แล้ว +2

    So couple things.. nylon/PTFE bearings are a thing. Might want to use 1 or 2 in the middle of the crankshaft. (Split bearing in half and compression fit.)
    Also a simple regulator would do wonders here.
    Also also.. maybe invest in some threaded rod? Seems like some of your problems are material based.

    • @loxus77
      @loxus77 ปีที่แล้ว

      ceramic ball bearing^^

    • @bobbiac
      @bobbiac ปีที่แล้ว

      @@loxus77 ball bearings would have high losses here. Just need a journal / bearing that is made of a self lubricating material

  • @RodrigoSilva-wp9fi
    @RodrigoSilva-wp9fi 3 ปีที่แล้ว +1

    Nice

  • @waldolemmer
    @waldolemmer ปีที่แล้ว

    Now it really needs a throttle and a load. You can probably get rid of the flywheel once you add a load

  • @joonalahti3695
    @joonalahti3695 3 ปีที่แล้ว +1

    Nice Job on The video keep going :)

  • @martinTintin476
    @martinTintin476 3 ปีที่แล้ว +2

    Hi. Its super. Did you calculate the air consumption? I would adjust the stroke and diameter of the drink.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      Thanks!
      I did not, should be relatively simple though to do for next time, need to know the initial and final pressure, know the volume of the bottle, can then calculate the mass of air used, knowing the duration of the engine running, can then get the air flow in g/s.
      Yes I intend to play around with these parameters.

  • @crackedemerald4930
    @crackedemerald4930 3 ปีที่แล้ว +1

    You should use a ball bearing seated against an o-ring, probably will help the leakage.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      I've actually just bought some to do this for next engine!

    • @crackedemerald4930
      @crackedemerald4930 3 ปีที่แล้ว

      @@kurzey8532 while you're here, maybe un-bend the inlet of the engine, si it's pointing up. Will probably be a little awkward, but the air should flow in a little happier.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      @@crackedemerald4930 the engine could be rotated 90 degrees to be inline, but then the flywheel orientation would also be flipped 90 degrees so the rotation would be on a different plane, I could use gears to I guess but extra complications again 🤣 even using tubing you have a bend so either you have to live with the bend or use gears to have it inline, at least that's my trail of thought, for now!

    • @crackedemerald4930
      @crackedemerald4930 3 ปีที่แล้ว

      @@kurzey8532 true, but unless you're up to something wanting to use the flywheel in the axis of the tank, having it point straight up with the rest of the engine, wouldn't be such a big deal, right?

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      @@crackedemerald4930 true, while I'm just testing wouldn't be a big deal, though id be surprised if it made a big performance difference it would certainly be easier to print, thanks for the suggestion :)

  • @LucasRoms
    @LucasRoms 3 ปีที่แล้ว +2

    This is very interesting, I was wondering if the stl files could eventually be available for printing?

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      I could make them available if enough people were interested!
      I actually have a tutorial video about 3/4 finished but currently working on other things and unsure whether to finish it as I'm finding it hard to make it both informative and interesting/fun to watch. So again, depends on the interest that might have.

  • @subuktageenfarooqi5712
    @subuktageenfarooqi5712 3 ปีที่แล้ว +1

    perhaps you could embed a 2-3mm steel rod in the shaft that keeps snapping. youre my first sub 500 subs channel that ive subacabribed to.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว +1

      The print orientation seemed to help out as I think it was the rotational force which cause it to snap, though now you mention it the weight of the flywheel would cause some bending on the shaft and could have contributed, so yes a steel (or other metal shaft) inside the part could make it stronger to rotational and bending forces
      Thanks for the suggestion and for the sub!

  • @UltraBadass
    @UltraBadass 3 ปีที่แล้ว +1

    What the hell man this video is good with some spicy memes I like it 🥖

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Haha thanks, glad you enjoyed the spice 😏

  • @paulmaydaynight9925
    @paulmaydaynight9925 3 ปีที่แล้ว

    re-enforce with simple heated steel wire pushed through the centre to reduce stresses.. loads more simple options...

  • @laurentoutan9922
    @laurentoutan9922 2 ปีที่แล้ว

    À 5 minutes : lanceur de toupie Beyblade 😎

  • @whybothertry8642
    @whybothertry8642 3 ปีที่แล้ว +1

    Loving it

  • @sorenjuntunen
    @sorenjuntunen ปีที่แล้ว

    You should use filament with carbon fiber to make it stronger

    • @kurzey8532
      @kurzey8532  ปีที่แล้ว

      Haven't tried carbon fibre yet, will look into it

  • @laurentoutan9922
    @laurentoutan9922 2 ปีที่แล้ว

    Ce système de POMPE / RESERVOIR / MOTEUR AIR COMPRIMÉ , un africain a fabriqué ce système mais avec une turbine, pour recharger les téléphones c est genial

  • @seskalarafey9285
    @seskalarafey9285 3 ปีที่แล้ว +1

    I do not know if this Idea is healthy for you or the Engine, but what if you put some light smoke inside the Air Compressed tube to make the Air Leaks more visible? Why i said unhealthy for you? Well, you do not Smoke right? :)

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      That's an Interesting idea, no haha I don't smoke, would have to make an exception in the name of science 🤣

  • @xavierobrien761
    @xavierobrien761 ปีที่แล้ว

    👍👍👍👍👍👍👍

  • @chrisskyr623
    @chrisskyr623 ปีที่แล้ว +2

    Where are you bro

  • @swecreations
    @swecreations ปีที่แล้ว

    Subscribed!

  • @jeffs5386
    @jeffs5386 2 ปีที่แล้ว

    Please make stl files available this is a awesome design

  • @forgiv3191
    @forgiv3191 3 ปีที่แล้ว

    I think you lose too much energy from vibration and friction, you could some oil to the engine and make it more balanced.

  • @karyjas1
    @karyjas1 3 ปีที่แล้ว

    Heres a stupid idea: 3d prints are always strong in one direction, but weak in the other. What if the engine was printed out of two, different print orientation 'layers' which would in the end be screwed or glued together to form the parts?

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      There's no stupid ideas! (Most of the time)
      The engine is already split into 4 parts, I think splitting it up further would be a pain 🤣 the worst part is the piston cylinder part, which I can't print in a different orientation because I need a really tight tolerance for the piston (0.25mm) so it needs to be printed as one part vertically to get the best fit, thanks for the suggestion though!

    • @karyjas1
      @karyjas1 3 ปีที่แล้ว

      @@kurzey8532 Then perhaps only do this to the parts that break and only if possible. I think that durability is the next main issue that stops the improvement of the engine

  • @loxus77
    @loxus77 ปีที่แล้ว

    fixe the ball bearing inside the 3d printing
    why not?

  • @ziad9516
    @ziad9516 3 ปีที่แล้ว +2

    How could I donate to you?

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      I'm flattered you would even want to donate to me so appreciate that!!
      Right now I don't have anything set up for donations like patreon or anything. I'm just focusing on making the best videos I can right now, if the videos continue to do well and there's enough interest I'll look at possibilities for ways you could support these videos in the future. For now if you're subscribed, liking and commenting on the videos then thats a big help!

  • @canaanthomas5563
    @canaanthomas5563 3 ปีที่แล้ว +1

    VTEC 💨

  • @ohnomyframerate7558
    @ohnomyframerate7558 3 ปีที่แล้ว

    what designer is this?

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      Do you mean what design software I'm using?

    • @ohnomyframerate7558
      @ohnomyframerate7558 3 ปีที่แล้ว

      @@kurzey8532 yes, I've been trying to get into 3D design but haven't found any good software.

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      @@ohnomyframerate7558 Fusion 360 is very good and free for personal use, there's also Solidworks and Tinker CAD which are popular too but I've not used.

  • @Dcjoe94
    @Dcjoe94 3 ปีที่แล้ว +1

    Upscale this ........ Engine to at least you car size... Or something you know kids sized

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      I would need a Huuuuge air tank to get any reasonable running time for an engine that size... or a high pressure vessel and pressure regulator system, both currently unfeasible because I'm bro....uhh due to my lack of resources, would love to try something like this tho!

    • @Dcjoe94
      @Dcjoe94 3 ปีที่แล้ว +1

      @@kurzey8532 . Sometimes makeshift things are the best 😂 like a what're heater converted into a pressure tank or something then like idk it would probably need to bee like a gocart buggy or something

    • @Dcjoe94
      @Dcjoe94 3 ปีที่แล้ว

      Become rich by makeing the first. Heres your million dollars idea.... Make the first air powered electric car...........

    • @kurzey8532
      @kurzey8532  3 ปีที่แล้ว

      @@Dcjoe94 would be fun to make for sure, I don't think air will take over electric anytime soon haha

    • @Dcjoe94
      @Dcjoe94 3 ปีที่แล้ว

      Steamboy lol

  • @KindOfyeah
    @KindOfyeah 3 ปีที่แล้ว

    All u did was change the high resistance fan to a flywheel that doesn't drive anything useful

    • @jhvnhjifgvbv8126
      @jhvnhjifgvbv8126 3 ปีที่แล้ว

      And all you did was?

    • @KindOfyeah
      @KindOfyeah 3 ปีที่แล้ว

      @@jhvnhjifgvbv8126 that's not the point. The point is that the title said he's upgrading the engine when all he's doing is changing the load

    • @jhvnhjifgvbv8126
      @jhvnhjifgvbv8126 3 ปีที่แล้ว +1

      @@KindOfyeah he's not just changing the load. The flywheel is an upgrade, as it helps the engine preserve momentum during the upstroke.

    • @KindOfyeah
      @KindOfyeah 3 ปีที่แล้ว

      @@jhvnhjifgvbv8126 The fan was also preserving momentum, however before it was driving something useful (as in blowing air) whereas now its not doing anything useful at all, so the numbers hes getting from it spinning are actually useless to grasp actually improving the engine at all.

    • @jhvnhjifgvbv8126
      @jhvnhjifgvbv8126 3 ปีที่แล้ว

      @@KindOfyeah I agree that comparing the numbers he got now with those he previously got doesn't make sense, but the fan wasn't really preserving momentum. The fact that it was blowing air means it had a hefty amount of air resistance which means it likely had a net negative amount of momentum it conserved. I do think he should have attached the fan along with the fly wheel to do a fair comparison, and it should be time spent spinning that he should be comparing mainly rather than rpm. From the last result, I think it spins longer than what the others where doing but it really isnt a fair comparison without the fan.