I have been curious about how the size and shape of a propeller affect its efficiency for a long time. I tested some propellers that I found in my drawer. I hope you find my experiment interesting!

@SWellWellWell

3 ай бұрын

It was educational and fun! Thank you!👍👍👍

@Sonnell

3 ай бұрын

It was fun, but it felt like it lacked the basic understanding of aerodynamics. I suggest you try the same tests next using smoke, then you'll understand a lot of misconceptions about how these stuff works. Like why the ball did not move close to the propeller but was sped up at a distance, or why non wing like "propellers" did not work.

@hydroworldoutlook5447

3 ай бұрын

@DrEngine It was very interesting! Thank you! 4:40 As a building tip, though, when building custom-made propellers using LEGO Technic panels like this, try not to build perpendicular to the axis of rotation like you did in this video, as the centrifugal force acts outwards on the propeller blades. What I mean by that is, try using pairs of either the 3L Technic universal joints (for controllable and variable-pitch propellers) or the 3L Technic angled axle connectors to mount the blades parallel to the axle or axis of rotation, and reinforce the blade connections on both the bottom and top halves of the propeller hub. 3L Perpendicular Pin and Axle connectors can be used to mount the blades onto the hub. I've found that this design is much more resistant to centrifugal force and can hence spin at much higher speeds (even ludicrous BuWizz or buggy motor speeds) without breaking apart. I will provide links to the parts I am talking about below. www.bricklink.com/v2/catalog/catalogitem.page?P=42003#T=S&O={%22iconly%22:0} www.bricklink.com/v2/catalog/catalogitem.page?P=32016#T=S&O={%22iconly%22:0} www.bricklink.com/v2/catalog/catalogitem.page?P=62520c01#T=S&O={%22iconly%22:0} Hopefully this helps! :)

@hydroworldoutlook5447

3 ай бұрын

@@Sonnell The ball did not move closer to the propeller because thrust from the propeller was exerting a forward force on the ball until the force of gravity interrupted the ball's motion (on steeper inclines). And non-wing propellers can work as long as each blade is set an angle, they are just less efficient than propellers with more aerodynamic blade types. Moreover, the propeller failure at timestamp 4:40 resulted from a structural integrity issue directly related to the propeller's design, not its aerodynamic performance. Centrifugal force acted outwards on the blades and overcame the frictional forces that held those blades to the propeller hub.

@AaronTureRonAbrahamsson157

3 ай бұрын

Very funny Videos! 😊

You have been running some props in the wrong direction. Best test them in both directions

@stonehengeman

3 ай бұрын

Also different amounts of power in each run.

@jessicaclark4350

2 ай бұрын

go-go gagit pixel reducer 0:01

@josephbruceismay6832

Ай бұрын

OH NO THE PIXELS! WHERE THEY'RE GOING?! [screams in 8p]

The wind detector falling over was a task failed successfully

4:21 THAT COUNTS???? hahahha aah omg you got me good

@hybrid.roodragon1226

3 ай бұрын

Lmfao

@jamilaanizou

4 күн бұрын

Yeah lol

+1 for the Hot Wheels track! Such a bummer to spend the time build up something like the 'wheel' only to find it completely ineffective. All AFOLs know this pain. Thank you!

Your design choice to put the 3 flags along the ramp really drew me in: Flag 1, Flag 2, Flag 3, The Box!!! Loved it ~ thank you 😊

@DrEngine

3 ай бұрын

Glad you like them!

@baitsforyou

2 ай бұрын

hi

I see several ways this test can be improved. 1) The tilted track means that at the higher levels, the propeller is no longer blowing along the axis of travel. A better setup would be if the track was attached directly to the motor frame, and the entire assembly was tilted. 2) Not all of the tests were at the same distance from the axis of rotation. A better setup would be three tracks, one at the bottom edge of the propeller, one at the center, and one at the top. The bottom one would trap air against the track, while the top would not, allowing comparison. 3) There are no really useful metrics. For an apples to apples comparison, make the track(s) longer, tilt them at 30 or 45 degrees, and attach a scale to the tracks. The propeller pushes the balls up the track, but it is long enough that the ball(s) 7:43 eventually stalls before reaching the end of the track. Measure the distance to get a comparable metric.

@DrEngine

3 ай бұрын

Amazing tips, thank you!

@whatusernameis5295

3 ай бұрын

also have the same amount of power behind each of the fans instead of changing it. that really messes it up when available power is changing (some of the earlier fans would have benefitted from more power but you didn't give them it then you gave later ones more power) unless you did keep the same number moters

You have to tilt the rotor as much as the slope to keep the force and it's vector constant

Putting in the propellers it just so satisfying

Another amazing feat of LEGO engineering!

the effort put into these videos is amazing

Absolutely loved this video since I always wanted to know which propeller worked best

@DrEngine

3 ай бұрын

Great to hear!

greate video bro!👍👍

@DrEngine

3 ай бұрын

Thanks! 👍

It’d be cool to compare ducted designs! Or maybe even multi-stage setups with progressive RPM on the addition fan stages? Or additional vanes after the fan to create laminar flow, which would increase the distance the air travels?

bro had such a good first try that it took a redesign and 9 other tries to beat it lmao

That´s amazing!! Greetings from Brasil!

Thank you so much for the informative video! The video quality is incredibly high! I am impressed!!!

@DrEngine

3 ай бұрын

Glad you enjoyed it!

@orangebg3761

2 ай бұрын

Hey the flaps on the fan you maid is reversed that's why it didn't work​@@DrEngine

More blades doesn't equal more wind. It's actually negatively affecting the amount of moved air by decreasing the efficiency of the vortex. Same reason boats or wind turbines usually only have 3 blades on a propeller. It's a fascinating science actually. I recommend looking it up.

@Vladimir.VovaSPB

3 ай бұрын

So, What makes more blades?

1:01 One must imagine Sisyphus happy

That one Propeller just ripped apart

Many of the props you have running in reverse. Take note of the aerofoil. The rounded edge leads the way. NOT the sharp edge. Had you used a snail scroll blower, you'd have sent that ping pong ball vertical.

love your channel

For some runs with small propellers, especially where they do not hit ~70% of max RPM, it would be good to test to remove the last reductor stage, for more torque & less friction

You're always so creative with your ideas. I'm always excited to see what you come up with next.

Maybe try to make a cilinder around some of them to funnel the wind?

@DrEngine

3 ай бұрын

Nice suggestion!

Great video! However, like all your previous ones👍🔥

@DrEngine

3 ай бұрын

Glad you like them!

The lego one is like a sounds like helicopter propeller broking

There’s official Leto rotor pieces, many from Lego city helicopters, would be cool to see them

Lego x HotWheels x White Ball, never expected such a collab!

I noticed(as some others have also stated) that some of the propellers seemed to have been spun backwards

There is a maximum power for the first half of the tests. A more effective prop takes more power so you end up with nothing but the 2 blade getting past 5 until the ducted fans.

my fyp be like! he woill watch anything

The wheel is pretty much just a large centrifugal fan which pulls air through the middle and flings it to the outside. You usually see them inside a cowling with one outlet for directing all that airflow to one area (usually inside someplace that needs cooling)

@DrEngine

3 ай бұрын

Thanks for the info!

If RPM's drops from maximum and wind speed stays almost same going to different propeller, than it tels you, you have not enought power. First few tests is not valid due to motor not being powerfull enought to drive all attached propellers at 11k rpm's. At that point you are not testing propellers, but motor.

@SWellWellWell

3 ай бұрын

or shows the influence of the propeller on the engine ;)

@oldhorn420

3 ай бұрын

He needs to use a brushless motor or put more motors

The truth is that having many blades does not mean the wind will be strong

4:37 cool

now make a flying plane built out of lego using this knowledge... It's probably impossible but with enough wing span and really light build, maybe the body just made out of cross axle rods and some fabric or vinyl for wings, and using a small non-lego motor with small battery it could be possible. Or maybe a rubber band plane? Would be cool Lego achievement nonetheless.

I think a small propeller might've done it too if it had a cowl around it.

The first level five edged me so bad bro

6:10 bro just want to move near the ball 💀

I know this might be extremely hard to do but what if you tried Contra-rotating props? The Antonov an70 has them

今学校で歯車使った学習してるからこのすごさがすごくわかる😊

The more complicated propellers cause more turbulence than airflow

Amazing ❤❤

@DrEngine

3 ай бұрын

Thank you! Cheers!

Most ships used three blades, because the drag lower the rpm and use more fuel

7:55 that "flop" made my day! 😂 so unexpected, yet so incredibly funny!!😂😂

@anadiacostadeoliveira4

2 ай бұрын

Everybody do the flop

Wouldn't it make sense to tilt the propellor in line to the desired direction of travel of the ball? You might have a propellor capable of lifting the ball vertically, but if you put the rail perpendicular, the ball won't move...

It's a bit of a flawed test, not only because the ball will just let the air flow around it and/or leave the air current as it ascends. Perhaps try propeller designs on a vehicle on rails, then you can measure both the weight and speed the designs can move?

I like the idea but you really should’ve made a stronger structure for the big heavy propellers and held them down to use them most effectively

Great propeller invention

I found this video very interesting. Thanks You might want to try one (or more) of your propellers with a single motor and different gear ratios. There will be a 'sweet spot' where 'matching' the propeller to the motor is best. Just a thought

@DrEngine

Ай бұрын

Thanks for the tips!

i am a big fan of your woke kip it up😁

6:42 turning OSHA into OSHI-

I enjoyed this video, but I would also like if you performed the tests again with more scientific rigor, using some of the comment suggestions like testing all the blades flipped around too, aligning the fan direction with the incline, and testing different gearing for the fans to see which gearing works best for each one.

adding more blades increases the drag

For some reason the white ones seem to work best

Planetary gearbox/gearset when?

Have you tried combining solar panel with Lego?😎👍

You should have angled the fans with the ramp

Wouldnt the Propeller 3 Blade 13 Diameter work better flipped around? Im just judging by the shape of the blades. Wouldnt it also be able to take in more air because of the curve?

Cool

2:14 that use for water

@minhkhangnguyen932

3 ай бұрын

7:56 bro make an whole tornado

Amazing video ❤ Part 2 with counter rotating blades

@DrEngine

3 ай бұрын

Noted!

Algumas helices foram montadas ao contrario. Helice tem lado e isso influencia drasticamente no resultado. O lado da pá que é convexo deve ficar virado pra onde entra o ar na hélice, o lado concavo deve ficar virado pra onde o ar sai.

What is that white lego part that likes lego?

2 of those are boat propellers, not aircraft.

Wow! You’re doing great work and I hope you are able to best! 😊

@DrEngine

3 ай бұрын

Thank you so much!

Model wheel = Model washing machine

Can you do a tutorial or show how to connect your Lego engine to your volt thing

Increasing the number of blades does not always lead to better results... 🤔

looks like size really does matter

go-go gadget pixel reducer

1:28 Rolling Shatter

Why didn't you use counter-rotating propellers?

Is the Model "WW" model a "Water Wheel" ?

Nice!

4:20 - Screw it

Nahw, you forgot to turn the white rotor blades by 90° - it will push much more are (and also creating much more resistance :D) Besides that little miss it isnice content, thanks ♥

@DrEngine

3 ай бұрын

Thanks for the tip!

What camera are you using?

can you do a drone next??

8:19 Why don't the levels fit with the wind speeds?

He will be hired by pratt & withney and lego

How does that work?

And now, we know. 😂

6:12 i think your spinning the "wheel" the wrong way

Nuevo suscriptor

very cool

nice

try to use a toroidal propeller it is way more efficient

I just saw this and wanted to comment

No measurement of thrust force as well as velocity

omg😆😁😄

1 : 12.6

Steell blade more effective

2:30

1:17

7:16 I like the 3 bladed fan blades, Sounds like a air conditioner, Build one

Use a regular fan

now test them on water

@DrEngine

3 ай бұрын

Nice suggestion! Thank you ☺️

@the-je6zn

3 ай бұрын

@@DrEngine your welcome

4:22 cheating