Lego Propellers in Water (worst to best)

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22 Lego propellers are tested in a water-filled container. Which one provides the most thrust? Enjoy!
2 non-Lego propellers are also tested for comparison.
Test method: a Lego Buggy motor (5292c01) and 7V input voltage. A weight scale measures the thrust in grams. Multiple gear ratios (from 1:25 to 5:1) and both directions of rotation are tested for each propeller. The test bench is explained in detail starting at 1:46.
Note: the list of gear ratios shown from 3:22 to 3:50 are incorrectly presented as inverse ratios. Sorry about that.
The results can be read in my blog:
brickexperimentchannel.wordpr...
0:00 propellers worst to best
1:00 RESULTS CHART
1:46 TEST BENCH
4:22 TEST PROCEDURE
5:44 6041 Propeller 3 Blade 3 Diameter with Axle Hole
6:08 4745 Propeller 2 Blade Twisted
6:40 92842 Propeller 3 Blade 5 Diameter
7:12 non-Lego boat propeller - Joysway 2-blade P1.4x40mm 83 series
7:51 30332 Propeller 3 Blade 9 Diameter
8:21 4751c Propeller 4 Blade 13 Diameter without Studs
9:02 2952 Propeller 2 Blade 9 Diameter
9:27 64683 Technic, Panel Fairing 3 Small Smooth Long, Side A
10:10 Lego liftarm propeller 2-blade 14x9 45-deg
11:05 18592 Propeller 3 Blade 13 Diameter (Ninjago Airjitzu)
11:39 41325 Propeller 4 Blade, for Flying Model Helicopter
12:26 2740c01 Technic Propeller 3 Blade with Gear 24 Tooth
13:10 non-Lego drone propeller Diatone Bull Nose 4 x 4.5
13:51 89509 - Propeller 1 Blade 14L with Two Pin Holes and Four Axles
14:41 COMPARISON TEST: 2 vs 4 blades
14:58 COMPARISON TEST: short vs long blades
15:23 COMPARISON TEST: 30 vs 45 vs 60 pitch angle
15:49 COMPARISON TEST: narrow vs wide blades
Music:
Heaven and Hell - Jeremy Blake
• Heaven and Hell - Jere...

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Опубликовано:

19 май 2024

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Комментарии : 472

@BeTheGr8 Месяц назад

Just straight into action. No intro, no sponsors, no bs. Love these kinds of channels

@justinarseneau4450 Месяц назад

@nissanoo0393 Месяц назад

can u recommend any other channels like this boss

@BeTheGr8 Месяц назад

@@nissanoo0393Primitive Technology, Cutting Edge Engineering Australia, Matthias Wandel, Code Bullet

@gilangvirgiawan2780 29 дней назад

Yes🎉

@abdelrahmanmekky7011 29 дней назад

@@nissanoo0393primitive technology but instead if lego it's nature

@drake52 Месяц назад

the fact that you are testing propellers makes me wonder if you are planning on revisiting your Lego submarine.

@rukirgaming Месяц назад

kinda seems like an anual tradition at this point

@BenjaminMarshallScienceMan Месяц назад

It would have been cool to only have the audio from the under water camera, that way you could hear the noise difference between the small and large propellers. In both watecraft and aircraft, small propellers have the trade-off of making more thrust per unit-area, but being significantly louder. That is one of the main reasons that fighter jets are so much louder than giant passenger aircraft despite having a fraction of the engine power, and why nuclear submarines utilize HUGE propellers that spin very slowly.

@GerinoMorn Месяц назад

There is a point where cavitation becomes an issue, right? And you get that ultra-loud collapsing bubble thing...

@BrickExperimentChannel Месяц назад

I just listened to the pure underwater audio. You're right. Smaller props are louder. :) By the way, that propeller camera was outside the water container. But I had a separate waterproofed Lavalier mic to capture the underwater noises. What you hear on the video is a 50/50 mix of the sound underwater and above it.

@mikieswart Месяц назад

@@GerinoMornahead flank; emergency speed. warning! vessel cavitating; excessive noise!

@BenjaminMarshallScienceMan Месяц назад

@@GerinoMorn Cavitation is caused by a rapid drop in pressure on the trailing edge of the blades, in aerospace the equivalent phenomenon is called 'boundary layer separation', which is the same thing that causes aircraft to stall and lose lift. As far as I'm aware it's simply an issue of your propeller moving too fast for its given blade pitch, so the only solution is to slow the propeller down or reduce pitch, meaning it needs to be larger to make the same thrust. Of course, the larger your propeller is, the faster the tips of the blades are moving at a given RPM, so scaling the size only goes so far.

@kennethmoureau5123 Месяц назад

@@mikieswartEject decoy!

@Themanhimself000 Месяц назад

Bro's the top lego engineer 🗿

@OverTheHorizon840 Месяц назад

I wish it had 3d lego propellers

@muffinconsumer4431 Месяц назад

“Bro-“ Brainrot

@Malfin_L Месяц назад

@@muffinconsumer4431 ok bro

@muffinconsumer4431 Месяц назад

@@Malfin_L Bro said ok bro

@Malfin_L Месяц назад

@@muffinconsumer4431 ok bro

@theo123-cookie Месяц назад

Helicopter helicopter

@Nomaditis Месяц назад

Paaaara kofer paara kofer 🗿

@unromanoarecareanaveragero8275 Месяц назад

You guys are 3 years late.

@AGERES_SDF Месяц назад

@@Nomaditishelicopter helicopter

@AlbertaGeek Месяц назад

Badger badger

@U014B Месяц назад

Yes, Papa?

@Username-qx9gk Месяц назад

Gramms per Watt would have been useful, but with the gears you also arrived the sweet spot for that motor. Although "static thrust" numbers could be very different to those when boat and prop are both moving fast through water

@ionstorm66 Месяц назад

To be fair I doubt a Lego powered boat is going to move fast enough the dynamic thrust will be too different then the static thrust.

@Elias-eo1vh Месяц назад

@@ionstorm66Maybe true, but it would be interesting to see how the different propellers would perform when it comes to top speed and/or efficiency, while the larger props generated a considerable amount of thrust, they also create much more drag and resistance when mounted on a moving boat.

@ABaumstumpf Месяц назад

Yeah would be very interesting. But there are the current-numbers and the voltage seems pretty stable. @@ionstorm66 There is no need for high speeds for significant difference to arise.

@BrickExperimentChannel Месяц назад

Good idea with the grams per Watt. I added that comparison to the blog. brickexperimentchannel.wordpress.com/2024/04/13/lego-propellers-water-thrust/

@Papinak2 Месяц назад

Just a little warning, these results are valid at 7V, closest to that is 6x rechargable AA batteries.

@koray8820 Месяц назад

top tier data analysis, im fully satisfied

@etepeteseat7424 Месяц назад

While I enjoy your build-up-to-the-best-bit style, I want to commend you for the intellectual honesty in getting directly to the showing off all the variations in this large-dataset case which otherwise might have had a very long build-up; not a second wasted, and once you'd shown the most clickbaity part of the video, you investigated each case further. Very respectful of your audience's time, thank you. 🙂

@FailRaceFan Месяц назад

I love these kinds of videos. Good old empirical science. Test a bunch of stuff, note the result, analyse, learn. Great resource when making boats, planes and helicopters.

@lwpeden5 Месяц назад

I loved the freeze frame on each propeller followed by their dimensions. Made me feel like I was watching a heist flick where all the characters with special abilities are being introduced.

@torpid5092 Месяц назад

Anybody else find this really weirdly relaxing? Just a quiet video with no dialogue and some experimenting

@papirus00000 Месяц назад

It's just like childhood lego experiments in your room

@KapitaenAwesome 21 день назад

Just like Primitive technology. (The OG, not the horrible ones with music and click bait building "underground pools"

@hermaeusmora4874 Месяц назад

Gotta go tell my gf that 15cm is indeed considered huge

@user-bc4wp8vr1d 16 дней назад

Nah bro, that's massive

@notaskirt7210 14 дней назад

😂😂😂

@rekire___ Месяц назад

My man trying to teach us mechanical engineering and thinking we wouldn't notice

@KiriMantiss Месяц назад

Had to stop and re-watch at 0:20 . I legit had thought it was a comically edited failure because of how smooth that piece just gently sank down. Love watching allt he test and trials you come up with. Keep up the awesome work!

@j-7005 Месяц назад

He is studying for the next Submarine!

@Bocchi-the-wide Месяц назад

Nahh that's wild why😭

@andrewpinedo1883 Месяц назад

@@Bocchi-the-wideI bet some of the components on that submarine were made of Lego.

@user-uu8ep1il5w 29 дней назад

⁠⁠⁠⁠@@Bocchi-the-wide He is talking about the Lego submarines BEC has made.

@IdealIdeas100 Месяц назад

its crazy how much more power some of the much smaller ones put out in comparison to the larger ones

@KingOfDams Месяц назад

Really educational!

@e1woqf Месяц назад

Next we need to know which design is the most efficient: thrust vs. power draw BTW: good work!

@BrickExperimentChannel Месяц назад

The non-Lego drone propeller wins that comparison. It gets 60 grams per Watt. From Lego propellers the white long panel 64681 wins it. :) brickexperimentchannel.wordpress.com/2024/04/13/lego-propellers-water-thrust/

@JushuaAbraham-sj2xl Месяц назад

As propellers are tested at zero forward speed it is more useful to be compared in term of "figure of merit"(thrust/shaft power)

@doubledarefan Месяц назад

Props to you for doing these experiments.

@user-uu8ep1il5w 29 дней назад

Hehe

@duncanfreeman5436 Месяц назад

THIS is peak content. Densely packed with information. Good testing procedures. Great usage of graphics. Legos!

@JoXDDFive Месяц назад

your videos are fantastic, from the editing, building puzzles solved to the top tier data analysis all in an easy to understand presentation WITHOUT saying a word!!!

@ResidentIT_ Месяц назад

i cant describe how much i love this channel. good, interesting test with good usable results. nothing is over the top and is a very relaxing watch. cant wait for the next sub video!

@peacekeepers_error Месяц назад

Wake up BEC uploaded a new video

@Maccaroney Месяц назад

Great video and i love the editing. Makes it really easy to watch. Would love to see these blades spun up really fast underwater for fun and maybe to find the failure modes.

@phillipbuck6104 Месяц назад

I appreciate how scientifically rigorous and well documented this is. Good experiment 👏

@The-creator-of-good-videos-15 Месяц назад

Cool Lego experiments, man! I hope they get better and better every day with each and every video you make. Awesome job, man! 👏🏻 👏🏻

@hedix13 Месяц назад

This is some incredible editing! Plus the effort in collecting the data itself! I know it's just Lego propellers, but I enjoyed watching the video. Thanks!

@sage5296 Месяц назад

Man the editing here is hella clean, very nice video, and the processes were very clearly laid out which is fantastic

@rumblehansi Месяц назад

props for this test and the editing

@lerikhkl Месяц назад

This is so thorough that I can't even think of something to add! Great job!

@puddinhead99 Месяц назад

this is incredibly in-depth and i appreciate your deligence

@catmage 22 дня назад

Wow, that is incredibly thorough testing. Well done!

@compi3882 Месяц назад

TBH I love how you just got straight to the point, and saved the details for later. Everything you needed to know, followed by everything you want to know.

@lincolngolladay Месяц назад

Thanks for all the time and effort for great data!

@dogvetusa Месяц назад

Thank you for going over the set up for testing too.

@TheElMexicano Месяц назад

Never a dull upload with this channel that’s for sure 👍

@motorhorn Месяц назад

Fascinating as always

@JosephsDesign Месяц назад

Very cool results and very thorough test procedure!

@goobydoo9278 Месяц назад

Everything about your videos are so efficient and informative

@breakfingers Месяц назад

Captivating video. Love all the graphics you showed

@DonLuca27 Месяц назад

Fantastic video, as always. I would have loved to see some efficiency comparison as well (power/thrust), maybe next time :P

@edcramer6475 Месяц назад

The instrumentation an attention to detail is great, data can be fascinating stuff.

@M0torsagmannen Месяц назад

now this is the answer thati never thought to question, very interesting results.

@jackmalcolm Месяц назад

This is amazing data collection/analysis

@pigletshut Месяц назад

That 2740c01 brings back memories. It was "the only prop" on the Technic 8855 prop plane set which I still have stowed away in a closet. How to drive it can be a challenge though.

@Irskin Месяц назад

You can *really* see the difference in directional thrust from the ones with an actual aero/hydrofoil shape to the blades, wow.

@jarrettbellboy 25 дней назад

Something about the #6041 fan that is so nostalgic. It was used in so many early 2000s wacky sets in underwater, space and plane sets in both earth tones and wild highlighter transparent colors.

@greatraven3839 Месяц назад

This feels like a college project for a fluid dynamics class. Well done!

@DonVigaDeFierro Месяц назад

Huge props to this channel!

@JeremyMcCrearyTechnicalLEGO Месяц назад

Excellent static thrust tests! Hoping you have some working LEGO powerboats in the works. During my LEGO powerboat heyday (see channel), tested all existing LEGO props and several easily adaptable non-LEGO props with methods much cruder than yours. The 2-blade 4745 turned out to be the best performer in speed trials, where many factors other than static thrust also come into play. Longer hulls with twin outdrives powered by their own L or XL motors were nearly always fastest. Buddies and I handily won the 2015 Brickworld boat drag race with such a boat fitted with 4745 props. If race rules had allowed us to sand the 4745's slab blades into airfoils, we'd have won by a much bigger margin. Real marine prop blades have airfoil profiles to add forward lift to the thrust generated by simply deflecting water aft. No LEGO prop blades had such profiles at the time. Also no LEGO counter-rotating pairs, which meant lots of propwalk. When not restricted by race rules, we always used 52-55 mm 3-blade counter-rotating props made for hobby-shop RC boats. No LEGO prop could come close in speed trials, with or without blade shaping. Naval architects consider the matching of hulls to powerplants to props something of a black art. Ditto for LEGO powerboats. The key is to arrange for the boat to come to max speed just as the motor's hitting peak mechanical power near 50% no-load shaft speed. That's where gearing becomes critical. Lots of guess-and-check involved.

@rhgamehamel6350 Месяц назад

Make working replica of engine using vacuum

@shivajoshi9068 Месяц назад

it was fascinating to see the difference between CW and CCW thrust may be sorta dependent on the difference of the pitch angles of the 2 sides of the propellers!! thank you for making such amazing videos! love the whole thing!

@Nikolai_The_Crazed 28 дней назад

This gives you a great idea of how well each propeller does under their respective optimal conditions, but what I’d like to see is a data set where all the propellers use the same rpm and gear ratio. That way we can see how the variation of those two factors changes the results. If they’re all taken from the same baseline first, then it gives a frame of reference for their performance under optimal gearing and rpm. It highlights what effects small compromises can have on performance. Someone might use more compact gearing for a smaller project, and get different results because of it.

@Eequality72521 Месяц назад

I really would like to see the input power that each was driven at

@NeinStein Месяц назад

The data is there: power is voltage times current. So e.g. at 12:10 it's: 7 V × 0.78 A = 5.46 W

@Matthias-499 Месяц назад

Nice video, like your Lego techniques a lot

@coltonverrier4976 Месяц назад

you have not even finished the vid yet

@r4ryder388 Месяц назад

How does one acquire so much red technic pieces?

@inkyencore0429 24 дня назад

eBay.

@TheWinjin Месяц назад

That level of comparison and analysis is heads and shoulders above all these RU-vid "engineers" that just eyeball the propellers. Looking at you, everyone with 3d-printer who just made something that looks a bit like the MIT toroidal propeller and tried to make comparison videos out of it. There's content and there's scientific content and I think we can see the difference

@peterrogulla7726 28 дней назад

At first i thought it was just like any good LEGO channel. Then i saw the "Biltema" tachometer, that confirmed my thoughts. Jokes aside, this is great content and i absolutely love the seriousness!

@Bayoll Месяц назад

Surprisingly advanced methodology

@Jamesonfp Месяц назад

id love to read the research paper you make from this

@HigginsObvious Месяц назад

Woah awesome results! Its been a while since I did any fluid mechanics, but I wonder if the biggest propeller wouldn't get better results in a larger test container? 1cm clearance seems like it could cause drag issues that might be making it look worse than it is.

@Zero-ry2rc Месяц назад

This was absolutely fascinating

@hubert3919 8 дней назад

You mean FANscinating?

@BenjaminGoldberg1 Месяц назад

Awesome. I would love to see some lego impellers. Or, better yet VSP-style cyclorotors.

@theoozmachine Месяц назад

It would be nice if you could make explained videos for some concepts you usually use like gear ratios, torque, and other such engineering concepts for us non engineers to understand

@webbostheman 12 дней назад

Performance curves of lego propellers... top tier content right here.

@WoLpH Месяц назад

For the 64683 Technic, Panel Fairing, you could try variable pitch and see what pitch works best. The tests are absolutely awesome in any case! I love it :)

@timehunter9467 Месяц назад

Nice to see the old ZNAP wheels being given a chance! I still have a lot of that stuff somewhere.

@mhas9110 Месяц назад

This is lovely research ❤

@SeresHotes25 22 дня назад

That's cool! It's interesting to see, what's RPM that will make make the motor to generate the most power. And then it's interesting to know, what's the RPM, that will make each propeller to generate the most force/power. We can then see the efficiencies in percents of each propeller.

@Omwekiatl 10 дней назад

wow, as a engineer, this is greateful to see, the definition of experiment, so clean so practic, woa

@silverground3670 Месяц назад

There are too many variables, but it's very nice and detailed and arranged very neatly and meticulously making it easy to understand

@LutraLovegood Месяц назад

This is gonna be very useful on my cars!

@koosnaamloos4291 Месяц назад

I love that somewhere, someone is going to find this incredibly useful for their own project

@Creativity_Sparks Месяц назад

0:19 the trust in that was so good, it literally made the piece come off.. 😂

@MrGustavier Месяц назад

Fascinating.

@RedShift5 Месяц назад

This is like Project Farm but for Lego. This man must also be protected at all costs.

@idowedo Месяц назад

I'm going to sit here in almost silence admiring the time and effort this took you to make, this is incredible.

@matthew.wilson Месяц назад

Bravo! Next step: A marine "wind" tunnel where you can test variable pitch against flow rate and give us some sweet 3D plots :)

@landfillbaby Месяц назад

good video! very thorough! i'm glad the classics work so well! do you think the ninjago ones would work better with the nosecone?

@kingofdambreach68 Месяц назад

*That's great, my friend. I tried Vortex experiments like yours!!! IT'S quite interesting* 🤗🤗🤗🤗🤗

@numberlorebut Месяц назад

Your experiments are also very cool

@hams_cuties Месяц назад

I love both channels. So fun and cool 😋

@clssgn Месяц назад

With those data, I think you could publish high quality lego engineering scientific article. It should be a thing, lol, getting it peer reviewed would be amazing. 😂😂 but always, so great to see your vids as always.

@OcelotTheGreat Месяц назад

Very nicely done!❤

@atmhso Месяц назад

Such a good video. My only scientific thought is the size of the container is limiting, in that it bounces the water back towards the propeller and alters the result. Still, minor quibble and probably wouldn't make a significant difference!

@CaptainWizard3000 Месяц назад

For the slippery one that required tape to be solid, you could’ve marked it (with a line on tape and prop) to see how much it rotated (if at all) after spinning.

@RandomBogey Месяц назад

I don’t know what I personally will ever do with any of this information. But, as someone who loves running numbers/data and Lego, I’m down for it

@norbert.kiszka Месяц назад

4:16 small clearance will cause propeller to generate less drag - similar thing we can observe with ducted fans like in turbofans, winglets in planes and with ground effect in low flying planes.

@zett5729 Месяц назад

Great Video. Would be Interesting to see the different performance patterns in active flow. A lot of Props can create really unintuitive thrust when measured in an active flow scenario.

@zett5729 Месяц назад

But no clue how you can create such a test structure.

@Gameplayer55055 Месяц назад

Now do some Lego Ocean Gate pressure testing lmao

@Atilolzz Месяц назад

Crazy cool research!

@3_Bricks. Месяц назад

It is clear that difficult work has been done. Like. 👍

@andrewzelitt Месяц назад

Would be neat if you did a demo where you slowly add food coloring from the bottom to see the pattern that each propeller leaves in the water.

@melody3741 Месяц назад

please remember pluber's tape is specifically designed for LOW friction if you look at many of the plumbers tape they only perform well at low gear ratios. likelyy because higher ones slip.

@TheGlitch93 Месяц назад

Can you try to form supercavitation on some props? Would be interesting to see how much RPM each small/medium prop can handle before it starts to form supercavitation...

@rthomp03 Месяц назад

Wow, quite the deep dive (no pun intended). I had no idea there were so many different propeller options. I assume this is part of a larger series of experiments to optimize a Lego boat or submarine? My only disappointment is you didn't make a 10-speed transmission, to avoid having to change out the propeller so often. Or even a CVT to optimize the RPMs even more.

@commelinales Месяц назад

So detailed.

@ivy7642 Месяц назад

I'd definitely like to see an efficiency curve, with amps versus thrust!

@user-fq4ss9bg9u Месяц назад

The beat at 4:50 was fire

@jamesgroccia644 Месяц назад

There's another 3-blade Lego prop. 1x Technic hub w/ 3 axles 3x 1x2 inverted slope 3x 1x2 plate 6x 1x1 cheese slope The thin end of the 1x2 slope makes the "scoop" of the blade